Key words: impregnation, ultra high density polyethylene, amoxicillin, subcritical freon R22
Because of investigation the method of impregnation of ultra high density polyethylene (UHDPE) with amoxicillin in subcritical freon R22 was developed. For the first time a possibility of polymer, impregnation with polar substance in the absence of modifier was demonstrated. Usually removal of modifiers from polymer matrix is a serious problem. Amoxicillin desorption curves (drug release) were calculated using HPLC method. Polymer samples impregnated with amoxicillin manifested antibacterial activities in relation to gram-positive and gram-negative microorganisms S. aureus, S. epidermidis, E. faecalis, B. subtilis, E. coli, that provides a perspective for using them as real models of implants for bone replacement.
Cite
ГОСТ
7.0.100-2018
Impregnation of Ultra High Density Polyethylene with Amoxicillin in Subcritical Freon Media / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 4-14. - DOI:
TRANSLIT
Impregnaciya sverhvysokomolekulyarnogo polietilena amoksicillinom v srede subkriticheskogo freona R22 / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 4-14. - DOI:
En
Impregnation of Ultra High Density Polyethylene with Amoxicillin in Subcritical Freon Media. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 4-14 (2017). https://doi.org/
Key words: synthesis in supercritical conditions, acetylacetone, mixed Ce-Zr oxides, dry reforming of methane
The paper considers the effect of zirconium starting compounds on the properties of mixed Ce-Zr oxides synthesized by solvothermal method in a flow reactor using ethanol and isopropanol as a supercritical media. Phase composition and structural properties of synthesized samples were investigated by X-ray diffraction and Raman spectroscopy. The morphology and textural properties were studied by transmission electron microscopy and thermal desorption of nitrogen. If zirconium oxychloride or acetate are used, the formation of mixtures of phases enriched in cerium or zirconium is observed, whereas in the case of zirconium butoxide added with a complexing agent (acetylacetone) a homogeneous solid solution is formed. The comparison of catalytic properties of synthesized oxides with supported Ni in the reaction of methane dry reforming demonstrated that the catalyst based on the single-phase mixed ceria-zirconia oxide is significantly more active, selective and stable to coking.
Cite
ГОСТ
7.0.100-2018
Synthesis of Ce<sub>1-x</sub>Zr<sub>x</sub>O<sub>2</sub> Oxides in Supercritical Alcohols and Based on Them Catalysts for Carbon Dioxide Reforming of Methane / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 15-28. - DOI:
TRANSLIT
Sintez oksidov Ce1-xZrxO2 v sverhkriticheskih spirtah i katalizatorov dlya uglekislotnoj konversii metana na ih osnove / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 15-28. - DOI:
En
Synthesis of Ce<sub>1-x</sub>Zr<sub>x</sub>O<sub>2</sub> Oxides in Supercritical Alcohols and Based on Them Catalysts for Carbon Dioxide Reforming of Methane. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 15-28 (2017). https://doi.org/
Key words: propiconazole, supercritical CO2, solubility, wood, drying, impregnation
Drying of wood in the supercritical (SC) CO2 and SC-CO2 added with ethanol (5%) media at 323, 343 and 353 K and 10, 20 and 30 MPa is studied. During the first drying cycle 40—87% of the initial moisture can be removed from the material. The number of cracks in the wood can be reduced by prolongation of the decompression stage of the drying process. Solubility of propiconazole in SC-CO2 is studied using a dynamic method. Its high saturation concentrations — (3—5)⋅10-3 mole per mole of СО2 — indicate that potentially SC-CO2 can be considered as a candidate solvent for impregnation of wood with propiconazole. It is demonstrated that through impregnation of wood samples can be achieved, and the efficiency of impregnation increases at increased duration of the process.
Cite
ГОСТ
7.0.100-2018
Wood Drying and Impregnation with Propiconazole Using Supercritical Carbon Dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 29-40. - DOI:
TRANSLIT
Sushka i impregnaciya drevesiny propikonazolom s ispol'zovaniem sverhkriticheskogo SO2 / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 29-40. - DOI:
En
Wood Drying and Impregnation with Propiconazole Using Supercritical Carbon Dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 29-40 (2017). https://doi.org/
Key words: supercritical fluid extraction, secondary lichen metabolites, usnic acid, Cladonia lichen genus, parameters of the extraction process
The process of supercritical fluid extraction (SFE) of secondary metabolites from Cladonia genus lichen with carbon dioxide is studied. The solid extract yield obtained via carbon dioxide extraction exceeds by far that obtained via acetone extraction in a Soxhlet apparatus. The maximum content of the target component — usnic acid — in the extract (91 %, yield — 2.5% of absolutely dry material) is obtained at 35 MPa, 40 °C and the SFE process duration 40 minutes. The product yield can be increased to 3% by the addition of co-solvents (acetone, ethanol, methylene chloride) to carbon dioxide.
Cite
ГОСТ
7.0.100-2018
Supercritical Fluid Extraction of Usnic Acid from <i>Cladonia</i> Genus Lichen / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 41-49. - DOI:
TRANSLIT
Sverhkriticheskaya flyuidnaya ekstrakciya usninovoj kisloty iz lishajnika roda Cladonia / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 41-49. - DOI:
En
Supercritical Fluid Extraction of Usnic Acid from <i>Cladonia</i> Genus Lichen. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 41-49 (2017). https://doi.org/
Key words: paracetamol, supercritical CO2, phase equilibrium, solubility, heat capacity, dispersing using SEDS method
Solubility of paracetamol in supercritical carbon dioxide and its mixtures with acetone is experimentally studied. Isobaric heat capacities of paracetamol and «paracetamol — SC—CO2», «paracetamol — acetone — SC—CO2» systems at 303—523 K and 7—29 MPa are measured. The results of paracetamol dispersing using the SEDS (Solution Enhanced Dispersion by Supercritical Fluids) method are presented.
Cite
ГОСТ
7.0.100-2018
Some Thermodynamic Characteristics of Paracetamol Dispersing Using the SEDS Method / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 50-68. - DOI:
TRANSLIT
Nekotorye termodinamicheskie harakteristiki processa dispergirovaniya paracetamola po metodu SEDS / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 50-68. - DOI:
En
Some Thermodynamic Characteristics of Paracetamol Dispersing Using the SEDS Method. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 50-68 (2017). https://doi.org/
Key words: ternary water-salts systems, supercritical phase equilibria, phase diagrams
Supercritical phase equilibria in ternary system K2SO4—KOH—H2O at 420—500 °C and up to 130 MPa pressure with binary boundary subsystems of different types are studied. The binary subsystem of type 1 do not have any critical phenomena in saturated (l = g — s) aqueous solution as well as the immiscibility equilibrium (l1—l2) (КОН—Н2O), the second binary subsystem of type 2 (K2SO4—H2O) has two critical end-points p (g = l — sK2SO4) and Q (l1 = l2—sK2SO4) with saturated aqueous solution and the liquid-liquid immiscibility equilibria. The ternary system has two three-phase equilibria (g — l — sK2SO4) and (l1 — l2 — sNa2SO4), separated by a two-phase supercritical fluid region (fl—sK2SO4) and two types of monovariant critical curves (g = l — sK2SO4) and (l1 = l2 — sK2SO4). The three?phase regions approach each other at temperature increased up to the point where the two-phase supercritical equilibrium disappeares, and the two mentioned monovariant critical curves are joined into a double homogeneous critical point (g = l — s ↔ l1 = l2 — s) at maximum temperature ∼ 445 °C and 51—52 MPa.
Cite
ГОСТ
7.0.100-2018
Solubility and Critical Phenomena in Ternary Aqueous Solutions, Containing the Salt of the Type 2 and Alkali / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 69-79. - DOI:
TRANSLIT
Pastvorimost' i kriticheskie yavleniya v trojnyh vodnyh rastvorah, soderzhashchih sol' vtorogo tipa i shcheloch' / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 69-79. - DOI:
En
Solubility and Critical Phenomena in Ternary Aqueous Solutions, Containing the Salt of the Type 2 and Alkali. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 69-79 (2017). https://doi.org/
Key words: oil shale, supercritical water, even/odd ratio, alkanes, alkenes, polyaromatic hydrocarbons, benzo- and dibenzothiophenes
The composition of oily fractions (OFs) formed by the Kashpir oil shale conversion in a flow of water vapor and supercritical water under uniform heating from 300 to 550 °C is studied by means of gas-chromatography/mass-spectrometry, IR and 1H NMR spectroscopy. A maximum yield of oil fraction is observed at 360–390 °C. Alkanes, alkenes, alkyl-derivatives of naphthalene and benzothiophene are the major components of OFs formed below 440 °C. A significant predominance of even alkanes and alkenes over their odd homologies is detected above 440 °C. The peculiarities in the varying of the content of specific groups and individual polyaromatic substances are discussed.
Cite
ГОСТ
7.0.100-2018
Peculiarities of Hydrocarbon and Heteroatomic Substances Composition Obtained at Conversion of Kashpir Oil Shale in Supercritical Water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2017. – Т. 12. – № 1. – С. 80-92. - DOI:
TRANSLIT
Osobennosti sostava uglevodorodov i geteroatomnyh soedinenij, poluchennyh pri konversii Kashpirskogo goryuchego slanca v sverhkriticheskoj vode / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2017. – Т. 12. – № 1. – S. 80-92. - DOI:
En
Peculiarities of Hydrocarbon and Heteroatomic Substances Composition Obtained at Conversion of Kashpir Oil Shale in Supercritical Water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 80-92 (2017). https://doi.org/