Key words: styrene, phenol, methylphenylcarbinol, acetophenone, ethylbenzene, propylene glycol, molybdenum, supercritical carbon dioxide, solubility, dynamic method, description of solubility, Peng — Robinson equation
Experimental results on solubility of the styrene, phenol, methylphenylcarbinol, acetophenone, ethylbenzene, propylene glycol and molybdenum as a complex with Trilon B in supercritical СO2 obtained using a dynamic (flow) method are presented. The obtained data are described in the framework of Peng — Robinson equation. The results of experiments on the extraction of organic components from the waste formed in the olefin epoxidation process at Nizhnekamskneftekhim Inc., on the analysis of extract composition, and on the testing of the extract as an epoxidation catalyst are presented.
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ГОСТ
7.0.100-2018
Supercritical СО<sub>2</sub> exreactions of waste components formed in propylene epoxidation process / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 3-12. - DOI:
TRANSLIT
Ekstrakciya komponentov othoda processa epoksidirovaniya propilena sverhkriticheskim SO2 / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 3-12. - DOI:
En
Supercritical СО<sub>2</sub> exreactions of waste components formed in propylene epoxidation process. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 3-12 (2012). https://doi.org/
Key words: subcritical water, extraction, phenolic compounds, flavonoids, antiradical activity, diphenilpicrylhydrazyl
A subcritical water extraction method for production of vegetable extracts possessing an antiradical activity is suggested. The major advantages of the method are (a) the possibility of extraction of up to 38 % of active substances of various chemical nature, including phenolic compounds, and (b) the absence of toxic organic solvents. The method is tested by producing extracts from Crataegus sanquinea Pall., Tilia cordata Mill., Helichrysum arenarium L., Matricaria recutita L. and Hypericum perforatum L. It is demonstrated that water- and ethanol-soluble fractions of obtained extracts have comparable antiradical activity measured in the reaction with diphenilpicrylhydrazyl radical.
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ГОСТ
7.0.100-2018
Antiradical activity of the vegetable extracts, obtained in the medium of subcritical water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 13-20. - DOI:
TRANSLIT
Antiradikal'naya aktivnost' rastitel'nyh ekstraktov, poluchennyh v srede subkriticheskoj vody / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 13-20. - DOI:
En
Antiradical activity of the vegetable extracts, obtained in the medium of subcritical water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 13-20 (2012). https://doi.org/
Key words: supercritical carbon dioxide, carboxylation, aromatic compounds, Lewis acids
A direct carboxylation of benzene and its derivatives PhX (X = Me, Br, Ph, OPh, OMe) and of mesitilene, durene and ferrocene in the presence of various Lewis acids (AlCl3, FeCl3, ZrCl4, ZnCl2) in supercritical CO2 medium is studied. In all the cases secondary transformations proceed faster compared to the primary reaction of carboxylic acid formation. For the system AlCl3/CO2/toluene studied in detail the optimal conditions of p-toluic acid formation are found. Quantum-chemical (DFT) calculations of carboxylation in AlCl3/CO2/benzene system using PRIRODA code allows one to trace a more energetically feasible reaction path.
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ГОСТ
7.0.100-2018
Carboxylation of aromatic compounds in supercritical carbon dioxide medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 21-35. - DOI:
TRANSLIT
Karboksilirovanie aromaticheskih soedinenij v srede sverhkriticheskogo dioksida ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 21-35. - DOI:
En
Carboxylation of aromatic compounds in supercritical carbon dioxide medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 21-35 (2012). https://doi.org/
Key words: oligomers of ethylene terephthalate, supercritical carbon dioxide, polyester fabric, dyeing, hydrophobization, superdispersed polytetrafluoroethylene
The effect of conditions of polyester fibrous material processing in supercritical carbon dioxide (SC-CO2) onto the localization of cyclic oligomers of ethylene terephthalate on the fiber surface is investigated. It is shown that the cyclic oligomers are deposited on the surface of polyester fibrous materials in the form of large associates. The mechanism of oligomer migration from the inner areas of polyester fiber plasticized in SC-CO2 is considered. Recommendations for the minimization of amount of oligomers localized on the surface of polyester fibrous materials during their dyeing in the SC-CO2 medium are suggested. It is shown that the deposition of oligomers on the surface of polyester fabrics does not negatively affect the quality of their hydrophobization by superdispersed polytetrafluoroethylene in SC-CO2 medium.
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ГОСТ
7.0.100-2018
Oligomeric ethylene terephthalate in the process of polyester modification in supercritical carbon / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 36-46. - DOI:
TRANSLIT
Oligomery etilentereftalata v processah modificirovaniya poliefirnyh tkanej v srede sverhkriticheskogo dioksida ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 36-46. - DOI:
En
Oligomeric ethylene terephthalate in the process of polyester modification in supercritical carbon. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 36-46 (2012). https://doi.org/
Key words: statistical physics, non-equilibrium theory, non-ideal systems, critical phenomena, local fluctuations, supercritical fluids
Exact analytical expressions for large-scale finite local fluctuations in hydrodynamic velocity and temperature of dense non-ideal fluid are obtained. Two simple models are proposed for probability distribution of density and temperature finite fluctuations. It is shown that the fluctuating fluid can be considered as two random fractions, one being more rarefied and the other being more dense than the averaged fluid. The distinctive features of these random fractions make them play different roles in physical and chemical behavior of the fluid. It is stated that large-scale finite local fluctuations are common for wide range of fluid states, not only for the neighborhood of gas— liquid critical point.
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ГОСТ
7.0.100-2018
The development of finite fluctuations in local density, velocity and temperature for real fluids / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 47-63. - DOI:
TRANSLIT
Razvitie lokal'nyh konechnyh fluktuacij plotnosti, kollektivnoj skorosti i temperatury v real'nyh flyuidah / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 47-63. - DOI:
En
The development of finite fluctuations in local density, velocity and temperature for real fluids. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 47-63 (2012). https://doi.org/
Key words: supercritical water, hazardous organic substances, kinetics and mechanism of oxidation, tubular reactors, corrosion
The studies aimed at the environmentally benign destruction of hazardous organic substances (OS) and wastes via their oxidation in supercritical water (SCW) are reviewed. The advantage of SCW application is the capability of complete and rapid oxidation of OS in closed systems. The rate of oxidation is determined by temperature, OS to SCW and oxidant ratios, bond strengths in molecules of OS, their solubility in SCW and decreased in a sequence of aliphatic > aromatic, heterocyclic > polycyclic aromatic substances. The main products of oxidation are CO2, H2O and N2; sulfur, phosphorus and halogens are converted into corresponding mineral acids. Still, there are several difficulties in practical implementation of particular processes on industrial scale and related to the achievement of acceptable endurance, sustained and accident- free operation of SCW oxidation units. Heterogeneous processes on reactor walls result in negative phenomena, such as corrosion of constructional materials, precipitation and deposition of salts, and, as consequence, in the varied with time on stream kinetics of the main and conjugated reactions.
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ГОСТ
7.0.100-2018
Destruction of hazardous organic substances in supercritical water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2012. – Т. 7. – № 1. – С. 64-88. - DOI:
TRANSLIT
Utilizaciya toksichnyh organicheskih veshchestv v sverhkriticheskoj vode / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2012. – Т. 7. – № 1. – S. 64-88. - DOI:
En
Destruction of hazardous organic substances in supercritical water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 64-88 (2012). https://doi.org/