Key words: high-pressure NMR, SC-CO2, mefenamic acid, 2D NOESY, small molecules, spatial structure
The spatial structure of mefenamic acid molecule was investigated by the 2D NOESY in SC-CO2 with DMSO (25% and 10 %). The results will be used to determine the optimal parameters of state for the micronization processing by GAS technique.
doi:10.34984/SCFTP.2021.16.3.001
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ГОСТ
7.0.100-2018
Conformational Analysis of Mefenamic Acid in SC-CO<sub>2</sub>–DMSO 2D NOESY Method / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 4-18. - DOI: 10.34984/SCFTP.2021.16.3.001
TRANSLIT
Konformacionnyj analiz mefenamovoj kisloty v SK-CO2–DMSO metodom 2D NOESY / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 4-18. - DOI: 10.34984/SCFTP.2021.16.3.001
En
Conformational Analysis of Mefenamic Acid in SC-CO<sub>2</sub>–DMSO 2D NOESY Method. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 4-18 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.001
Key words: lignin, 2D NMR structure, phenols, depolymerization, gasification, hydrogen production
Aqueous solutions of depolymerized lignin with a concentration of 12—15 g/l were obtained by treating an aqueous suspension for 4 hours at 250 °C and 10 MPa. The transformation of lignin in the resulting solution was studied at sub- (320 °C, 30 MPa) and supercritical (400—650 °C, 30 MPa) parameters in a continuous flow reactor. It is shown that the degree of lignin depolymerization increases with increasing temperature and reaches its maximum value at 650 °C; the process results in the formation of hydrocarbons of various groups, including derivatives of benzene and phenol. At temperatures above 600 °C, intense gasification of lignin occurs with the production of gas mixtures containing up to 40 vol.% hydrogen.
doi:10.34984/SCFTP.2021.16.3.002
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ГОСТ
7.0.100-2018
Transformation of Hydrolysis Lignin in an Aqueous Medium in Sub- and Supercritical Conditions / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 19-24. - DOI: 10.34984/SCFTP.2021.16.3.002
TRANSLIT
Transformation of Hydrolysis Lignin in an Aqueous Medium in Sub- and Supercritical Conditions / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 19-24. - DOI: 10.34984/SCFTP.2021.16.3.002
En
Transformation of Hydrolysis Lignin in an Aqueous Medium in Sub- and Supercritical Conditions. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 19-24 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.002
Key words: sodium lignosulfonate, silicon dioxide, aerogel, textural characteristics, supercritical fluids
The synthesis of new composite aerogel materials based on sodium lignosulfonates obtained by various methods of delignification (sulfite and modified bisulfite) and silica using solgel technology and supercritical fluid processes was performed. It was shown that aerogels based on sulfite lignosulfonate are characterized by a more developed porous structure compared to aerogels based on bisulfite lignosulfonate. The pore volume of aerogels based on sulfite lignosulfonate was 1.4—2.0 cm3g-1, which is 1.5—7.0 times more than that of aerogels based on bisulfite lignosulfonate. The specific surface area of aerogels based on sulfite and bisulfite lignosulfonates was 284—452 and 104—280 m2g-1, respectively.
doi:10.34984/SCFTP.2021.16.3.003
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ГОСТ
7.0.100-2018
Preparation of Aerogel Composite Materials Based on Lignosulphonates and Silica / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2021. – Т. 16. – № 3. – С. 25-32. - DOI: 10.34984/SCFTP.2021.16.3.003
TRANSLIT
Poluchenie aerogel'nyh kompozicionnyh materialov na osnove lignosul'fonatov i kremnezema / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 25-32. - DOI: 10.34984/SCFTP.2021.16.3.003
En
Preparation of Aerogel Composite Materials Based on Lignosulphonates and Silica. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 25-32 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.003
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.
doi:10.34984/SCFTP.2021.16.3.004
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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 <i>in situ</i> 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 / – Tekst : neposredstvennyj // 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 <i>in situ</i> EPR-Method. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 33-41 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.004
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.
doi:10.34984/SCFTP.2021.16.3.005
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ГОСТ
7.0.100-2018
Supercritical Carbon Dioxide Extraction of Wild Grape (<i>Parthenocissus</i>) 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) / – Tekst : neposredstvennyj // 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 (<i>Parthenocissus</i>) Seed Fatty Oil. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 42-50 (2021). https://doi.org/10.34984/SCFTP.2021.16.3.005
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.
doi:10.34984/SCFTP.2021.16.3.006
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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 / – Tekst : neposredstvennyj // 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: 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.
doi:10.34984/SCFTP.2021.16.3.007
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ГОСТ
7.0.100-2018
Application of SC-CO<sub>2</sub> 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 / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2021. – Т. 16. – № 3. – S. 58-72. - DOI: 10.34984/SCFTP.2021.16.3.007
En
Application of SC-CO<sub>2</sub> 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
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.
doi:10.34984/SCFTP.2021.16.3.008
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ГОСТ
7.0.100-2018
Structuring and Phase Formation During the Treatment of La/Al<sub>2</sub>O<sub>3</sub> 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 / – Tekst : neposredstvennyj // 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/Al<sub>2</sub>O<sub>3</sub> 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 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.
doi:10.34984/SCFTP.2021.16.3.009
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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 / – Tekst : neposredstvennyj // 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