Key words: palm oil, Shea oil, ethanol, sub- and supercritical fluid conditions, transesterification, biodiesel, kinematic viscosity coefficient
The results of an experimental study of the process of obtaining biodiesel fuel by
transesterification of Shea (Karite) and palm oils carried out in ethanol under supercritical
fluid conditions on a batch unit using preliminary ultrasonic emulsification of the reaction
mixture are presented. The studies were carried out in a temperature range of 623—673 K
at a pressure of 30 MPa, a range of «alcohol—oil» molar ratios of 30—42, and a reaction
duration of 30 minutes. Preferred reaction conditions have been established. The results
of an experimental study of the kinematic viscosity of samples of initial oils and the
product of the transesterification reaction The results of an experimental study of the
kinematic viscosity of samples of initial oils and the product of the transesterification
reaction are presented.
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ГОСТ
7.0.100-2018
The Transeterification of Shea (Karite) and Palm Oils in Supercritical Ethanol / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 76-88. - DOI: 10.34984/SCFTP.2022.17.1.006
TRANSLIT
Pereeterifikaciya masla dereva SHi (Karite) i pal'movogo masla v sverhkriticheskom etanole / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 76-88. - DOI: 10.34984/SCFTP.2022.17.1.006
En
The Transeterification of Shea (Karite) and Palm Oils in Supercritical Ethanol. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 76-88 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.006
Key words: water, supercritical propane/butane mixture, phase equilibrium, solubility, thermodynamic model, Peng—Robinson equation of state
The results of an experimental study of the phase equilibrium of the «water—propane/butane»
system carried out in the temperature range of 403—443 K and the pressure range
of 5.28—20.66 MPa using a high-pressure optical cell are presented. The V type of phase
behavior is established. The solubility of water in a supercritical propane-butane mixture
under the above mentioned thermodynamic conditions is estimated based on the
characteristics of the steam branch of the phase equilibrium of the «water—propane/butane»
system and described using the Peng—Robinson equation of state in combination
with the Mukhopadhyay and Rao mixing rule was made.
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ГОСТ
7.0.100-2018
Phase Equilibrium of the Binary System «Water—Propane/Butane» / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 66-75. - DOI: 10.34984/SCFTP.2022.17.1.005
TRANSLIT
Fazovoe ravnovesie binarnoj sistemy «voda—propan/butan» / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 66-75. - DOI: 10.34984/SCFTP.2022.17.1.005
En
Phase Equilibrium of the Binary System «Water—Propane/Butane». Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 66-75 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.005
Key words: supercritical fluid extraction, carbon dioxide, acid-base hydrolysis, epigean lichen, Peltigera aphthosa, chitin-containing complex
This research was funded with the financial support of the Ministry of Economic
Development, Industry and Science of the Arkhangelsk Region within the framework of the
project «Obtaining a new chitin-containing material (product) for veterinary and biological
purposes from promising plant sources of the Arkhangelsk Region» (agreement No. 2 dated
September 22, 2021), the Ministry of Science and Higher formation of the Russian Federation
in terms of supercritical fluid extraction (project No. FSRU-2021-0009. Instrumentation of
the Core Facility Center «Arktika» of Northern (Arctic) Federal University and «Critical
technologies of the Russian Federation in the field of environmental safety of the Arctic»
(N. Laverov Federal Center for Integrated Arctic Research) was used in this work.
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ГОСТ
7.0.100-2018
Isolation of Chitin-Containing Complexes from the Thalli of the Lichen Species Peltigera Aphthosa / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 49-65. - DOI: 10.34984/SCFTP.2022.17.1.004
TRANSLIT
Vydelenie hitinsoderzhashchih kompleksov iz talloma lishajnika vida Peltigera aphthosa / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 49-65. - DOI: 10.34984/SCFTP.2022.17.1.004
En
Isolation of Chitin-Containing Complexes from the Thalli of the Lichen Species Peltigera Aphthosa. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 49-65 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.004
Key words: rapeseed oil hydrolysis, oleic acid oxidation, azelaic acid esterification, heterogeneous catalyst, supercritical conditions, 2-ethylhexyl ether
Three chemical stages of azelaic acid 2-ethylhexyl ester synthesis based on rapeseed oil
were studied: hydrolysis of the initial oil, oxidation of oleic acid in the presence of
palladium-containing heterogeneous catalyst, and esterification of azelaic acid. It is
demonstrated that reactions hydrolysis and esterification can be efficiently carried out
under supercritical conditions (523—653 K and 22.5—30 MPa).
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ГОСТ
7.0.100-2018
On the Efficiency of Carrying out Chemical Reactions under Supercritical Conditions During the Synthesis of Azelaic Acid 2-Ethylhexyl Ether Based on Rapseed Oil / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 37-48. - DOI: 10.34984/SCFTP.2022.17.1.003
TRANSLIT
Izuchenie vozmozhnosti provedeniya v sverhkriticheskih usloviyah himicheskih reakcij pri sinteze 2-etilgeksilovogo efira azelainovoj kisloty na osnove rapsovogo masla / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 37-48. - DOI: 10.34984/SCFTP.2022.17.1.003
En
On the Efficiency of Carrying out Chemical Reactions under Supercritical Conditions During the Synthesis of Azelaic Acid 2-Ethylhexyl Ether Based on Rapseed Oil. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 37-48 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.003
Key words: organo-metallic copper complexes, solubility, supercritical carbon dioxide, copper acetylacetonate, impregnation
The solubility of copper (II) acetylacetonate in supercritical carbon dioxide was studied using a circulation-type setup based on the P-401 supercritical fluid extraction system, and the obtained results were compared with the literature data. The solubility of this complex at 323 and 333 K isotherms was additionally investigated. The possibility of using various metal complex copper compounds in the impregnation treatment
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ГОСТ
7.0.100-2018
Solubility of Copper Acetylacetonate(II) in Supercritical Carbon Dioxide as the Basis of polymer Composite materials Modification Technology / – Текст : // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 26-36. - DOI: 10.34984/SCFTP.2022.17.1.002
TRANSLIT
Rastvorimost acetilacetonata medi(II) v sverhkriticheskom diokside ugleroda kak osnova tekhnologii modifikacii polimernyh kompozitnyh materialov / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 26-36. - DOI: 10.34984/SCFTP.2022.17.1.002
En
Solubility of Copper Acetylacetonate(II) in Supercritical Carbon Dioxide as the Basis of polymer Composite materials Modification Technology. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 26-36 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.002
Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand
Key words: extraction, supercritical fluid, cerium complexes, aqueous solutions, tributyl phosphate
The extraction of Ce(III) and Ce(IV) complexes with tributyl phosphate (TBP) from aqueous solutions of various acidity in the presence of a salting-out agent (magnesium nitrate) into supercritical (SC) fluids, CO2 and freon R23, was studied under static and dynamic conditions. It is shown that SC-CO2 is a more efficient extractant than freon R23. The efficiency of Ce(III) extraction increases with an increase in the concentration of magnesium nitrate and the amount of TBP in the system and decreases with an increase in the acidity of the aqueous solution. The dependence of the extraction efficiency on pressure is more complex: at a pressure of SC-CO2 below 10 MPa (at 40 °C), the solubility of TBP in it drops sharply. As the pressure rises above this value, the degree of transition of the Ce(III) complex into the fluid phase decreases. An equation for the extraction isotherm is obtained and its parameters are determined for conditions close to optimal for the extraction of Ce(III). Cerium in the form of Ce(IV) is more efficiently extracted by SC-CO2 even at high acidity of the aqueous solution; however, the state of Ce(IV) in the aqueous solution of its complex is unstable; the complete transition to the Ce(III) state occurs within ~14 days. Dynamic extraction using a countercurrent extraction column cannot be described in terms of the «theoretical separation steps» (or «theoretical plates») model. The reason, apparently, is the instability of the TBP solution in the SC-fluid and the formation of a suspension of small drops of liquid TBP, which is a more efficient extractant than the true solution of TBP in the fluid. At the same time, such a transition leads to a sharp increase of the efficiency of the extraction column as a mass transfer apparatus.
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ГОСТ
7.0.100-2018
Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 3-25. - DOI: 10.34984/SCFTP.2022.17.1.001
TRANSLIT
/ – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 3-25. - DOI: 10.34984/SCFTP.2022.17.1.001
En
Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 3-25 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.001
Key words: cruciate ligament prosthesis, decellurization, supercritical fluid, biocompatible material, collagen frame, xenogenic materials
A prototype of a cruciate ligament (ACL) prosthesis from a lamb tendon was created. For
the manufacture of this product, a raw material processing technology was developed,
including mechanical and chemical-physical methods, including exposure to a supercritical
fluid of carbon dioxide, with a nonionic surfactant Tween 80 for decellularization, that is,
destruction of cells and extraction of their components with immunogenic properties, as
well as the removal of residues of toxic substances after treatments, while maintaining
the physical and mechanical properties. Histological studies were carried out for the
remainder of cellular elements and measurements of the strength properties of the
material and it was shown that the cells were removed, and the physical and mechanical
properties did not deteriorate.
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ГОСТ
7.0.100-2018
Method for Treating Calf Tendon with Supercritical Carbon Dioxide with Detergent for Making Cruciate Ligament Prosthesis / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 83-87. - DOI: 10.34984/SCFTP.2021.16.4.008
TRANSLIT
Obrabotka baran'ego suhozhiliya sverhkriticheskim dioksidom ugleroda s detergentom dlya izgotovleniya proteza krestoobraznoj svyazki / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 83-87. - DOI: 10.34984/SCFTP.2021.16.4.008
En
Method for Treating Calf Tendon with Supercritical Carbon Dioxide with Detergent for Making Cruciate Ligament Prosthesis. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 83-87 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.008
Key words: subcritical water, extracts of Ginkgo biloba leaves (Ginkgo biloba L.), polyphenols, flavonoids, inhibitory AChE-activity, Alzheimer’s disease
The extracts of Ginkgo biloba (GB) leaves obtained in a medium of subcritical water
(SBW) in the temperature range of 100 °C—220 °C were studied for the first time in
order to assess the prospects for the use of GB leaf extracts for the prevention and
treatment of neurodegenerative disorders, such as, for example, Alzheimer’s disease. The
relationship of the activity of inhibition of the enzyme acetylcholinesterase (AChE)
with the content of polyphenols and flavonoids was studied. The inhibitory activity of
GB leafn extracts was expressed as IC50 values (an extract concentration that inhibits
the AChE enzyme by 50 %), determined by dose-effect curves. It is shown that the
content of polyphenols and flavonoids in the extracts obtained, and the inhibition activity
of AChE extracts depends on the extraction method: if the traditional aqueous-ethanol
extract has an anti-AChE-activity of IC50 = 3.57 mg/ml, then SBW- extracts are more
effective inhibitors of AChE. At the same time, the maximum inhibitory activity of AChE,
in a number of extracts obtained, was demonstrated by an extract obtained in the medium
of SBW at 220 °C (IC50 = 0.74 mg/ml). At the same time, the AChE-activity of the
obtained extracts of GB leaves correlates with the quantitative content of the sum of
polyphenols and flavonoids, respectively. The total content of polyphenol (the sum of
polyphenols per gallic acid or rutin) was highest in the extract obtained in medium of
SBW at 220 °C, whereas the extract obtained at 100 °C in SBW was the lowest in content
of polyphenols. The total content of flavonoids (in terms of rutin) was highest in extracts
obtained in medium of SBW at 200—220 °C (24.6 mg equivalent to rutin/g dry weight of
raw materials), and the lowest content in GB leaf extract obtained in SBW at 120 °C
(10.6 mg rutin equivalent/g dry weight).
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ГОСТ
7.0.100-2018
Evaluation of the Polyphenolic Content and of Acetylcholinesterase Inhibition Activity of Ginkgo biloba (Ginkgo biloba L.) Leaf Extracts Obtained in Subcritical Water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 70-82. - DOI: 10.34984/SCFTP.2021.16.4.007
TRANSLIT
Ocenka polifenol'nogo sostava i aktivnosti ingibirovaniya acetilholinesterazy ekstraktov list'ev ginkgo biloba (Ginkgo biloba L.), poluchennyh v subkriticheskoj vode / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 70-82. - DOI: 10.34984/SCFTP.2021.16.4.007
En
Evaluation of the Polyphenolic Content and of Acetylcholinesterase Inhibition Activity of Ginkgo biloba (Ginkgo biloba L.) Leaf Extracts Obtained in Subcritical Water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 70-82 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.007
Key words: phenol, activated carbon, adsorption, desorption, regeneration, sub- and supercritical water
The paper presents the research results of dynamic adsorption of phenol by activated
carbon (AC) in the medium of liquid, sub- and supercritical water (26 °C, 0.1 MPa and
24—400 °C, 25 MPa) and subsequent regeneration of AC under similar conditions. It is
shown that the adsorption—desorption isotherms are characterized by the presence of
hysteresis. An increase in pressure at room temperature leads to an increase in the
adsorption capacity, and an increase in temperature at 25 MPa leads to a decrease in it. The
amount of phenol remaining in the AC after regeneration decreases with increasing
temperature and does not depend on pressure. The relative average rate of phenol desorption
increases sharply at T ≥ 200 °C. It was found that the greatest increase in the specific
surface area and pore volume occurs when AC is treated with supercritical water.
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ГОСТ
7.0.100-2018
Dynamic Adsorption—Desorption of Phenol by Activated Carbon in the Medium of Sub- and Supercritical Water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 56-69. - DOI: 10.34984/SCFTP.2021.16.4.006
TRANSLIT
Dinamicheskaya adsorbciya—desorbciya fenola aktivirovannym uglem v srede sub- i sverhkriticheskoj vody / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 56-69. - DOI: 10.34984/SCFTP.2021.16.4.006
En
Dynamic Adsorption—Desorption of Phenol by Activated Carbon in the Medium of Sub- and Supercritical Water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 56-69 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.006
Key words: fluorinated tetraphenylporphyrins, MF-4SK copolymer, photosensitized cholesterol oxidation
The immobilization of fluorinated tetraphenylporphyrins in the matrix of the sulfocathionite
perfluorinated copolymer MF-4SK and the photosensitized oxidation of cholesterol in
the presence of obtained composite were carried out in the supercritical (SC) carbon
dioxide medium. It is shown that the reaction proceeds with the formation of
6-formyl-B-norcholestane-3β,5β-diol (a potential antitumor agent), in contrast to the homogeneous
photooxidation of cholesterol, where main product is 7α-hydroperoxide-3β-hydroxycholest-5-ene.
A reaction mechanism has been proposed, which assumes the process
takes place inside the «ion channels» of MF-4SK.
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ГОСТ
7.0.100-2018
Fluorinated Porphyrins Immobilized on Perfluorinated Copolymer MF-4SK in Supercritical Carbon Dioxide as Photosensitizers of Singlet Oxygen Generation In Biologically Active Substrates Oxidation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 42-55. - DOI: 10.34984/SCFTP.2021.16.4.005
TRANSLIT
Ftorirovannye porfiriny, immobilizovannye na perftorirovannom sopolimere MF-4SK v srede sverhkriticheskogo dioksida ugleroda, kak fotosensibilizatory generacii singletnogo kisloroda v processah okisleniya biologicheski aktivnyh substratov / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 42-55. - DOI: 10.34984/SCFTP.2021.16.4.005
En
Fluorinated Porphyrins Immobilized on Perfluorinated Copolymer MF-4SK in Supercritical Carbon Dioxide as Photosensitizers of Singlet Oxygen Generation In Biologically Active Substrates Oxidation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 42-55 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.005
Key words: salmeterol base, salmeterol xinafoate, supercritic fluid chromatography, enantiomers
The physicochemical features of the chiral separation of isomers of salmeterol xinafoate
and salmeterol base were studied by supercritical fluid chromatography (SFC) in analytical
and preparative modes. The influence of the composition of the mobile phase, temperature
and pressure on retention, peak shapes and selectivity of chiral separation of the salmeterol
base racemate in the analytical chromatography mode was studied. The optimal conditions
for the separation of the enantiomers of salmeterol base on an analytical column Chiralpak IG
in supercritical CO2 (SC-CO2) have been revealed. The behavior of salmeterol
xinafoate was studied under conditions of preparative SFC analysis.
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ГОСТ
7.0.100-2018
Chiral Separation of Salmeterol Isomers by Supercritical Fluid Chromatography / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 34-41. - DOI: 10.34984/SCFTP.2021.16.4.004
TRANSLIT
Hiral'noe razdelenie izomerov salmeterola metodom sverhkriticheskoj flyuidnoj hromatografii / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 34-41. - DOI: 10.34984/SCFTP.2021.16.4.004
En
Chiral Separation of Salmeterol Isomers by Supercritical Fluid Chromatography. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 34-41 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.004
Key words: Mo—V—Nb—Te—O-catalysts, oxidative dehydrogenation, ethane, ethylene, molecular oxygen
The process of oxidative dehydrogenation of ethane (ODE) at elevated pressure on
mixed oxide catalyst MoVNbTeOx has been investigated. It was found that when the
reaction is carried out at 280 °C with an increase in pressure from 0,1 to 10,0 MPa, the
proportion of the total amount of reacted oxygen consumed for the formation of ethylene
decreases from 100 to 68 %, which may indicate an increase in the role of chemisorbed
oxygen in the ODE process at high pressure. In this case, the productivity for ethylene at
280 °C and 10,0 MPa higher compared to the value obtained at 360 °C and 0,1 MPa.
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ГОСТ
7.0.100-2018
Effect of Pressure on the Oxidative Dehydrogenation of Ethane with Molecular Oxygen on Mixed Oxide MoVNbTeOx Catalyst / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 27-33. - DOI: 10.34984/SCFTP.2021.16.4.003
TRANSLIT
Vliyanie davleniya na okislitel'noe degidrirovanie etana molekulyarnym kislorodom na smeshannom oksidnom MoVNbTeOx-katalizatore / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 27-33. - DOI: 10.34984/SCFTP.2021.16.4.003
En
Effect of Pressure on the Oxidative Dehydrogenation of Ethane with Molecular Oxygen on Mixed Oxide MoVNbTeOx Catalyst. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 27-33 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.003
Key words: aluminum oxide, group II metal compounds, water fluid, ammonia, aluminates, heat treatment
The formation of mixed oxides in the Al2O3—MO (M — Mg, Ca, Sr, Ba) system during
heat treatment and treatment with water fluids (WF) has been studied. It is shown that
during high-temperature treatment of mixtures of aluminum hydroxide Al(OH)3 with
nitrates of metals of group II, aluminates of the composition MAl2O4 are formed mainly,
sometimes with an admixture of aluminates of a different composition. If the same mixtures
undergo preliminary treatment in a water fluid (400 °C, fluid density 0,2 g/cm3), then the
sample is more complex, which is associated with dehydration and partial structuring of
the Al-containing component during processing in a WF medium. It is shown that the
addition of ammonia to WF has a stimulating effect on the formation of double oxides,
first of all, due to the alkaline hydrolysis of salts of II group metals and the formation of
corresponding hydroxides; the reduction of nitrates and nitrites with ammonia is apparently
a secondary process.
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ГОСТ
7.0.100-2018
Peculiarities of the Formation of Compounds and Phases in the Systems Al2O3 — MO (M — Mg, Ca, Sr, Ba) During Treatment in Water Fluids / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 14-26. - DOI: 10.34984/SCFTP.2021.16.4.002
TRANSLIT
Osobennosti obrazovaniya soedinenij i faz v sistemah Al2O3–MO (M – Mg, Ca, Sr, Ba) pri obrabotke vodnymi flyuidami / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 14-26. - DOI: 10.34984/SCFTP.2021.16.4.002
En
Peculiarities of the Formation of Compounds and Phases in the Systems Al2O3 — MO (M — Mg, Ca, Sr, Ba) During Treatment in Water Fluids. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 14-26 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.002
Key words: hypercrosslinked polystyrene, supercritical carbon dioxide, metal compounds, supercritical fluid chromatography, adsorption, di phenylacetylene, specific catalytic activity
Metal — hyper-cross-linked polystyrene (HCP) composites active in the hydrogenation of
unsaturated hydrocarbons were obtained by impregnation of HCP with palladium and rhodium
compounds in supercritical carbon dioxide (SC-CO2) followed by their reduction to the
metallic state with molecular hydrogen. The influence of the conditions for the preparation of
composites on their activity and selectivity in the hydrogenation of diphenylacetylene (DFA)
was evaluated. The adsorption of palladium hexafluoroacetylacetonate on HCP from the SCCO2
medium was studied for the first time using supercritical fluid chromatography; it is
shown that the adsorption equilibrium is described by the Langmuir equation.
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ГОСТ
7.0.100-2018
Formation of Metal–Hypercrosslinked Polystyrene Composites in a Supercritical Carbon Dioxide Medium and their Catalytic Properties in the Hydrogenation of Diphenyl Acetylene / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 4. – С. 4-13. - DOI: 10.34984/SCFTP.2021.16.4.001
TRANSLIT
Formirovanie kompozitov metall—sversshityj polistirol v srede sverhkriticheskogo dioksida ugleroda i ih kataliticheskie svojstva v gidrirovanii difenilacetilena / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 4. – S. 4-13. - DOI: 10.34984/SCFTP.2021.16.4.001
En
Formation of Metal–Hypercrosslinked Polystyrene Composites in a Supercritical Carbon Dioxide Medium and their Catalytic Properties in the Hydrogenation of Diphenyl Acetylene. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 4-13 (2021). https://doi.org/10.34984/SCFTP.2021.16.4.001
Key words: supercritical antisolvent preci pitation, crystallization, morphology
The effect of the solvent and the concentration of the micronized substance in the
solution on the size and morphology of adipic acid particles preci pitated by supercritical
antisolvent preci pitation (SAS) is investigated. An increase of the concentration of the
micronized substance in the solution leads to a decrease in the particle size of adi pic acid,
as well as a narrowing of the particle size distribution. Depending on the solvent used and
the concentration of adi pic acid in the solution, it is possible to produce particles of
various morphologies ranging in size from tens to hundreds of microns via SAS.
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ГОСТ
7.0.100-2018
Micronization of Adipic Acid via Supercritical Antisolvent Precipitation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 91-104. - DOI: 10.34984/SCFTP.2021.16.3.009
TRANSLIT
Mikronizaciya adipinovoj kisloty metodom sverhkriticheskogo antisol'ventnogo osazhdeniya / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 91-104. - DOI: 10.34984/SCFTP.2021.16.3.009
En
Micronization of Adipic Acid via Supercritical Antisolvent Precipitation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 91-104 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.009
Structuring and Phase Formation During the Treatment of La/Al2O3 Catalyst Precursors in Water Fluids
Key words: aluminum oxide, lanthanum oxide, water fluid, hydration, lanthanum aluminate, morphology
The effect of the synthesis method on the formation of the structure and composition of
materials composed of porous alumina supported lanthanum oxide, has been studied. The
effect of the morphology of porous aluminum oxide (α-modification) on the formation
of various compounds (oxide La2O3 and aluminates LaAlO3 and La10Al4O21) during
thermal treatment of a support impregnated with a solution of lanthanum nitrate is
shown. It was found that when systems are treated in a water fluid, the processes of
structuring and phase formation proceed at a much lower temperature and more intensively
than under thermal action, which is due to the high mobility of structural elements in a
hydrated state. It is shown that the formation of LaAlO3 aluminate is limited by the
hydration of the initial aluminum oxide, which proceeds more intensively in the case of
its γ-modification. Varying the sequence and conditions of the stages of treatment in a
water fluid and thermal action makes it possible to obtain composites of various
morphologies and containing various single and complex oxide compounds and phases.
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ГОСТ
7.0.100-2018
Structuring and Phase Formation During the Treatment of La/Al2O3 Catalyst Precursors in Water Fluids / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 73-90. - DOI: 10.34984/SCFTP.2021.16.3.008
TRANSLIT
Strukturirovanie i obrazovanie faz pri obrabotke vodnymi flyuidami predshestvennikov katalizatorov La/Al2O3 / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 73-90. - DOI: 10.34984/SCFTP.2021.16.3.008
En
Structuring and Phase Formation During the Treatment of La/Al2O3 Catalyst Precursors in Water Fluids. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 73-90 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.008
Key words: supercritical carbon dioxide, synthetic matrix, carbonate-substituted hydroxyapatite, macroporosity, polyethylene glycol, resorbability, vancomycin, antibacterial substance, purulent-septic inflammation
A method for producing macroporous matrices based on carbonate-substituted
hydroxyapatite containing vancomycin has been developed. The matrices combine
bioresorbability, osteoconductivity, the possibility of volumetric impregnation of antibiotics
without losing their activity and prolonging their release. In this work the technology for
producing the matrix includes, as a final, stage of treatment with supercritical CO2. This
makes it possible to completely remove the organic solvent — the extractant of the poreforming
additive (polyethylene glycol granules), increasing the biocompatibility of the
matrix, which is confirmed by the results of histological examination during subcutaneous
implantation. The activity of vancomycin during its volumetric incorporation into the
calcium phosphate matrix has been proven in the zones of inhibition of the growth of
bacterial cultures. It has been proven in vivo experiments with bone implantation that the
matrix is a therapeutically effective carrier of antibacterial substance for the treatment of
purulent-septic inflammation of bone tissue.
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ГОСТ
7.0.100-2018
Application of SC-CO2 in the Technology of Obtaining Calcium Phosphate Matrixes for Treatment of Purulent-Septic Inflammations of Bone Tissue / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 58-72. - DOI: 10.34984/SCFTP.2021.16.3.007
TRANSLIT
Primenenie SK-CO2 v tekhnologii polucheniya kal'cijfosfatnyh matriksov dlya lecheniya gnojno-septicheskih vospalenij kostnoj tkani / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 58-72. - DOI: 10.34984/SCFTP.2021.16.3.007
En
Application of SC-CO2 in the Technology of Obtaining Calcium Phosphate Matrixes for Treatment of Purulent-Septic Inflammations of Bone Tissue. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 58-72 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.007
Key words: carbon dioxide, reduction of CO2, reverse water gas shift reaction, Fe,Cr-containing catalysts
The reduction of carbon dioxide with molecular hydrogen in the presence of Fe,Cr-containing
catalysts supported on Sibunit carbon material at 400°C and pressures of 0,1
and 8,5 MPa was studied. Selective formation of carbon monoxide is possible over the
catalysts with the ratio Fe : Cr = 1—5. C1—C4 hydrocarbons with a predominance of
methane are formed along with CO at decreasing chromium content in the catalyst
(5Fe—0,25Cr/C sample). It was shown by transmission electron microscopy that the
main phase in 5Fe—5Cr/C catalyst is iron chromite FeCr2O4 (spinel structural type),
which prevents the reduction of iron and the formation of its carbides, which, in turn,
provide the formation of hydrocarbons upon the interaction of CO2 and H2.
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ГОСТ
7.0.100-2018
Interaction of Carbon Dioxide with Hydrogen on Supported Fe,Cr-Containing Catalysts / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 51-57. - DOI: 10.34984/SCFTP.2021.16.3.006
TRANSLIT
Vzaimodejstvie dioksida ugleroda s vodorodom na nanesennyh Fe,Cr-soderzhashchih katalizatorah / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 51-57. - DOI: 10.34984/SCFTP.2021.16.3.006
En
Interaction of Carbon Dioxide with Hydrogen on Supported Fe,Cr-Containing Catalysts. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 51-57 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.006
Key words: CO2-extraction, fatty acid, wild grape, Parthenocissus, elemental composition
The work first presents data on the supercritical extraction of Parthenocissus oil and its
fatty-acid, phytosterol, and elemental composition. We perform a comparative analysis of
derived data with the literature ones. Unlike the varietal grapes extract, the supercritical
extract of Parthenocissus is determined to contain eicosanic acid.
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ГОСТ
7.0.100-2018
Supercritical Carbon Dioxide Extraction of Wild Grape (Parthenocissus) Seed Fatty Oil / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 42-50. - DOI: 10.34984/SCFTP.2021.16.3.005
TRANSLIT
Cverhkriticheskaya uglekislotnaya ekstrakciya zhirnogo masla kostochek dikogo vinograda (Parthenocissus) / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 42-50. - DOI: 10.34984/SCFTP.2021.16.3.005
En
Supercritical Carbon Dioxide Extraction of Wild Grape (Parthenocissus) Seed Fatty Oil. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 42-50 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.005
Key words: supercritical carbon dioxide, electron paramagnetic resonance spectroscopy, thermoresponsive polymers, spin probes
For the first time, impregnation of thermoresponsive graft copolymer between N-isopropylacrylamide
and oligolactide (P(NIPAM-co-PLA)) with stable nitroxyl radical 4-oxo-2,2,6,6-tetramethyl-piperidine-1-oxyl
(TEMPONE) was performed in SC-CO2 medium
using a high-pressure reactor, which allows registering electron paramagnetic resonance
(EPR) spectra in situ.
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ГОСТ
7.0.100-2018
TEMPONE Radical Diffusion in the Graft Copolymer of N-Isopropyl Acrylamide with Oligolactid in the Presence of Supercritical Carbon Dioxide by the in situ EPR-Method / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 33-41. - DOI: 10.34984/SCFTP.2021.16.3.004
TRANSLIT
Diffuziya radikala TEMPONE v graft-sopolimere N-izopropilakrilamida s oligolaktidom v prisutstvii sverhkriticheskogo dioksida ugleroda metodom EPR in situ / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 33-41. - DOI: 10.34984/SCFTP.2021.16.3.004
En
TEMPONE Radical Diffusion in the Graft Copolymer of N-Isopropyl Acrylamide with Oligolactid in the Presence of Supercritical Carbon Dioxide by the in situ EPR-Method. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 33-41 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.004