C 89 Critical properties of hydrogen peroxide determined from direct measurements [Text] / E. D. Nikitin, P. A. Pavlov, A. P. Popov, N. E. Nikitina // Journal of Chemical Thermodynamics. - 1995. - V. 27, №9. - P945-952 Рубрики: ФИЗИКА Кл.слова (ненормированные): СВОЙСТВА КРИТИЧЕСКИЕ -- КРИТИЧЕСКИЕ СВОЙСТВА -- ГИДРОГЕН ПЕРОКСИД -- ИЗМЕРЕНИЯ ПРЯМЫЕ -- ПРЯМЫЕ ИЗМЕРЕНИЯ -- ТЕПЛОФИЗИКА Аннотация: The critical temperatures and the critical pressures of aqueous solutions with mass fractions of hydrogen peroxide from 0 to 0.9 have been measured using the pulse-heating method applicable to thermally unstable substances. The critical temperature and the critical pressure of pure hydrogen peroxide have been determined by extrapolation. The results are compared with the values predicted by various methods |
N 64 Nikitin, E. D. (Vapour+liquid) critical properties and accentric factors of fine low-molarmass methylphenysiloxanes [Text] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // Journal of Chemical Thermodynamics. - 1994. - V. 26. - P1047-1050 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПАР -- ЖИДКОСТИ -- СВОЙСТВА КРИТИЧЕСКИЕ -- КРИТИЧЕСКИЕ СВОЙСТВА -- МЕТИЛФЕНИСИЛОКСАН НИЗКОМОЛЯРНЫЙ -- НИЗКОМОЛЯРНЫЙ МЕТИЛФЕНИСИЛОКСАН -- МЕТИЛФЕНИСИЛОКСАН ТОНКИЙ -- ТОНКИЙ МЕТИЛФЕНИСИЛОКСАН -- ТЕПЛОФИЗИКА |
N 64 Nikitin, E. D. (Gas+liquid) critical temperatures and pressures of polyethelene-glycols from HOCH2CH2OH to H(OCH2CH2)v=132OH [Text] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // Journal of Chemical Thermodynamics. - 1995. - V. 27, №1. - P43-51 Рубрики: ФИЗИКА Кл.слова (ненормированные): ЛИТЬЕ -- жидкости -- ТЕМПЕРАТУРА КРИТИЧЕСКАЯ -- КРИТИЧЕСКАЯ ТЕМПЕРАТУРА -- ДАВЛЕНИЕ -- ПОЛИЭТИЛЕН-ГЛЮКОЛЬ -- HOCH2CH2OH -- H(OCH2CH2)v=132OH -- H -- O (КИСЛОРОД) -- C -- ВОДОРОД -- КИСЛОРОД -- УГЛЕРОД Аннотация: The critical temperatures and pressures of mono-, di-, tri-, and tetra-ethene glycols, and polyethene glycols with nominal molar massesM/M°(whereM°= 1 g·mol−1) equal to 300, 400, and 600, have been measured by the pulse-heating method applicable to thermally unstable substances. The results have been correlated as a function of the molar mass using the hole theory of liquids developed by Kurata and Isida with a slight modification |
P 84 Popov, A. P. Flashing of decomposing aqueous solutions of hydrogen peroxide [Text] / A. P. Popov, E. D. Nikitin // Fluid Mechanics Research. - 1992. - V. 21, N 4. - P43-49 Рубрики: ФИЗИКА Кл.слова (ненормированные): ВСКИПАНИЕ РАСТВОРА -- РАСТВОР ВОДНЫЙ -- ПЕРЕКИСЬ ВОДОРОДА |
N 64 Nikitin, E. D. Vapor-liquid critical properties of some tetraalkoxysilanes [Текст] / E. D. Nikitin, A. P. Popov, V. A. Simakina // Journal of Chemical & Engineering Data. - 2008. - Vol. 53, № 6. - С. 1371-1374 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR-LIQUID Аннотация: The critical pressures and the critical temperatures of ten tetraalkoxysilanes (tetraalkyl esters of silicic acid) Si[O(CH2)nH]4 with n = 1 to 10 have been measured. All the substances studied begin to decompose at temperatures below their critical points. The method of pulse-heating applicable to thermally unstable compounds has been used. Residence times were from (0.03 to 1) ms, which resulted in little decomposition of the substances during measuring. The experimental critical properties of tetraalkoxysilanes have been compared with the values estimated by the group-contribution methods of Lydersen and Nannoolal et al \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2008, v.53, p. 1371.pdf |
N 64 Nikitin, E. D. Critical Point Measurements for n-Alkyl Benzoates (C8 to C13) [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2007. - Vol. 52, № 4. - С. 1336-1339 Рубрики: ФИЗИКА Кл.слова (ненормированные): ALKYL BENZOATES Аннотация: The critical temperatures and critical pressures of six n-alkyl benzoates C6H5COO(CH2)nH with n = 1 to 6 have been measured. All the substances are thermally unstable at their critical points. The method of pulse-heating of a wire probe placed into the liquid under study has been used. Residence times are from (0.03 to 1) ms, which results in little decomposition of the liquid in the course of measuring. The experimental critical properties of alkylbenzoates have been compared with the values estimated by the group contribution methods of Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2007, v.52, p.1336.pdf |
N 64 Nikitin, E. D. Vapor-Liquid Critical Properties of Phenol and (C8 to C10)Phenylalkanols [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2007. - Vol. 52, № 1. - С. 315-317 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR-LIQUID Аннотация: The critical pressures and temperatures of phenol and three phenylalkanols C6H5(CH2)nOH with n = 2 to 4 have been measured. These substances are thermally unstable at their critical points. The pulse-heating method with ultralow residence times has been used. Residence times are from (0.03 to 1) ms. The experimental critical properties of phenol and phenylalkanols have been compared with the values calculated using the group-contribution methods by Constantinou and Gani and by Marrero and Gani \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2007, v.52, p.315.pdf |
V 28 Vapor Pressures, Enthalpies of Vaporization, and Critical Parameters of a Series of Linear Aliphatic Dimethyl Esters of Dicarboxylic Acids [Текст] / S. P. Verevkin, S. A. Kozlova, V. N. Emel'yanenko, E. D. Nikitin, A. P. Popov, E. L. Krasnykh // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 5. - С. 1896-1905 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR PRESSURES Аннотация: Vapor pressures and the molar enthalpies of vaporization of the linear aliphatic dimethyl esters of dicarboxylic acids CH3-CO2-(CH2)n-CO2-CH3 with n = (0 to 8) have been determined by the transpiration method. A linear correlation of enthalpies of vaporization (at T = 298.15 K) of the esters studied with the number n and with the Kovat's indices and has been found. The critical temperatures and pressures of the esters with n = (0 to 6) and n = 8 have been measured by the pulse-heating method with the residence times ranging from (0.03 to 1) ms. Experimental data on the critical properties are compared with the estimations by group contribution methods by Constantinou and Gani and by Marrero and Gani. Both methods considerably underestimate the critical temperatures of the esters studied; however, the method by Marrero and Gani provides the prediction of the critical pressures of the esters with an average absolute error approximately equal to the uncertainty of the measurements. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1896.pdf |
N 64 Nikitin, E. D. Critical-Point Measurements for Phenylethanoic to 7-Phenylheptanoic Acids [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1335-1338 Рубрики: ФИЗИКА Кл.слова (ненормированные): ACIDS Аннотация: The critical temperatures and pressures of phenylalkanoic acids with a straight alkyl chain C6H5(CH2)nCOOH (n = 1 to 6) have been measured. The method of pulse heating of a wire probe placed into the substance under study has been used. The method minimizes the thermal decomposition because residence times are from (0.035 to 1) ms. An equation for the correlation of the critical pressures of phenylalkanoic acids with the number of CH2 groups between phenyl and carboxyl functional groups and molar mass has been obtained. The experimental critical constants of phenylalkanoic acids have been compared with the values calculated by the group-contribution methods of Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1335.pdf |
N 64 Nikitin, E. D. Critical Temperatures and Pressures of 12 Phthalates Using the Pulse-Heating Method [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1326-1330 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL TEMPERATURES Аннотация: The critical temperatures and pressures of phthalates with the straight side alkyl chains C6H4?1,2-[COO(CH2)nH]2 (n is from 1 to 11) as well as bis(2-ethylhexyl) phthalate have been measured. No literature data are available for the critical properties of phthalates. Since phthalates decompose at temperatures well below their critical temperatures, the method of pulse heating of a wire probe immersed into the liquid under study has been used. The method minimizes the effect of thermal decomposition because residence times are only from (0.035 to 1) ms. The experimental critical properties of phthalates have been compared with the values calculated using the group-contribution methods by Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1326.pdf |
N 64 Nikitin, E. D. Critical Pressures and Temperatures of n-Diaminoalkanes (C2 to C12) [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 2. - С. 609-111 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL PRESSURES Аннотация: The critical temperatures and pressures of eight n-diaminoalkanes NH2(CH2)nNH2 with n = 2, 3, 4, 6, 8, 9, 10, and 12 have been measured. The method of pulse heating of a wire probe immersed into the liquid under study has been used. Residence times are from (0.03 to 1) ms. The critical properties of diaminoalkanes have been estimated by the group-contribution methods by Joback and Reid, Constantinou and Gani, and Marrero and Gani. These properties have also been calculated using a method based on the assumption that the functions describing the dependence of the critical properties of homologous series on the number of mers in a molecule should be self-similar and provide the scaling behavior for long-chain molecules. The last method provides the best accuracy in calculating the critical properties of diaminoalkanes. For this method, the average absolute errors are equal to 0.4 % for the critical temperature and about 2 % for the critical pressure. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.609.pdf |
N 64 Nikitin, E. D. Vapor-liquid critical properties of squalane measured by the pulse-heating technique [Текст] / E. D. Nikitin, A. P. Popov // Fluid Phase Equilibria. - 2005. - Vol. 237, № 1-2. - С. 16-20 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL POINTS -- MEASUREMENT -- ALKANES Аннотация: The critical temperature and pressure of squalane (2,6,10,15,19,23-hexamethyltetracosane) have been measured using the pulse-heating method. Residence times are from 0.03 to 1 ms. The experimental critical properties are compared with the results of measurement by a flow method, computer-simulation data, and the values calculated by the group-contribution methods. The critical temperature of squalane is about 2.5% lower and the critical pressure is 10% higher than those of its linear isomer-n-triacontane. \\\\Expert2\\NBO\\Fluid Phase Equilibria\\2005. v.237, p.16.pdf |
N 64 Nikitin, E. D. Liquid-Vapor Phase Tsansition in the Front of Chemical Reaction between Aqueous Solutions of Hydrogen Peroxide and Potassium Permanganate [] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // High Temperature. - 1998. - V.36, N4. - С. 565-571 Рубрики: ФИЗИКА Кл.слова (ненормированные): TRANSITION PHASE -- TRANSACTION LIQUID-VAPOR -- REACTION CHEMICAL -- SOLUTION AQUEOUS -- HYDROGEN PEROXIDE -- HYDROGEN -- H -- POTASSIUM PERMANGANATE -- POTASSIUM -- K |
N 64 Nikitin, E. D. Critical temperatures and pressures of some alkanoic acids (C2 to C22) using the pulse-heating method [] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // Fluid Phase Equilibria. - 2001. - Vol. 189, N 1-2. - С. 151-161. - Bibliogr: p. 160-161 (26 n.) . - ISSN 0378-3812 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL TEMPERATURES -- CRITICAL PRESSURES -- ACIDS -- ALKANOIC ACIDS -- PULSE-HEATING METHOD -- LIQUIDS -- NUMBER OF CARBON ATOMS -- MOLAR MASS Аннотация: This paper presents experimental critical temperatures and pressures of 12 alkanoic acids CnH2nO2 with carbon numbers from 2 to 22. The method of pulse heating of a wire probe placed in the liquid under study has been used. Equations for the correlation of the critical temperatures and pressures of alkanoic acids with the number of carbon atoms and molar mass have meen obtained. |
T 34 Temperature of Attainable Superheating of Some Commercial Petroleum Products [] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // High Temperature. - 2001. - Vol. 39, N 1. - С. 93-96: il. - Bibliogr: p. 100 Рубрики: ФИЗИКА Кл.слова (ненормированные): TEMPERATURE -- TEMPERATURE OF ATTAINABLE SUPERHEATING -- SUPERHEATING -- ATTAINABLE SUPERHEATING -- PETROLEUM PRODUCTS \\\\Expert2\\NBO\\High Temperature\\2001, v.39, p.93.pdf |
C 89 Critical Temperatures and Pressures of Some Tetraalkoxytitaniums / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk, V. A. Simakina // Journal of Chemical & Engineering Data. - 2010. - Vol.55, №1. - С. 178-183 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL PRESSURES -- CRITICAL TEMPERATURES -- TETRAALKOXYTITANIUMS Аннотация: The critical pressures and the critical temperatures of nine tetraalkoxytitaniums, Ti[O(CH2)nH]4 with n = 2 to 10, have been measured. All of the substances studied begin to decompose at temperatures below their critical points. The method of pulse heating applicable to thermally unstable compounds has been used. Residence times were from (0.03 to 0.46) ms, which resulted in little decomposition of the substances during measuring. The contributions of the titanium(IV) atom in the group contribution methods of Constantinou and Gani and Marrero and Gani have been calculated from the experimental data. The critical pressures and temperatures of tetraalkoxytitaniums have been estimated by these methods |
N 64 Nikitin, E. D. Temperatures of the Attainable Superheat of Some Thermally Unstable Liquids / E. D. Nikitin, P. A. Pavlov, A. P. Popov // International Journal of Thermophysics. - 2002. - Vol.23, №2. - С. 529-541 Рубрики: ФИЗИКА Кл.слова (ненормированные): HOMOGENEOUS NUCLEATION -- KINETIC PARAMETERS -- WIRE PROBE Аннотация: The paper gives the results of measuring the temperatures of the attainable superheat of some liquids that are thermally unstable at these temperatures. The technique of heating a thin wire probe placed into a liquid under study with electric-current pulses has been used. The length of pulses is from 10–5 to 10–3 s, which corresponds to a heating rate of 105 to 108 K·s–1. The influence of a chemical reaction in the liquid phase on the temperature of the attainable superheat has been considered. In particular, it has been shown that boiling initiated by an elementary act of an exothermic chemical reaction is of a low probability. A method of calculating the temperature of the attainable superheat of thermally unstable liquids under conditions of quick heating has been developed. A method for the determination of the kinetic parameters of thermal decomposition from the measurements of the temperature of the attainable superheat is discussed |
Nikitin, E. D. Critical Point Measurements for Five n-Alkylcyclohexanes (C6 to C10) by the Pulse-Heating Method / E. D. Nikitin, A. P. Popov, N. S. Bogatishcheva // Journal of Chemical & Engineering Data. - 2003. - Vol.48, №5. - С. 1137-1140 Кл.слова (ненормированные): ALKYLCYCLOHEXANES -- CARBONS -- METHODS OF LYDERSEN Аннотация: This paper presents experimental critical temperatures and pressures of five n-alkylcyclohexanes C6H11CnH2n+1 with the number of carbons in the side chain n = 0, 1, 2, 3, or 4. The method of pulse heating of a wire probe immersed into the liquid under study has been used. Residence times are from (0.01 to 1) ms. Equations for the correlation of the critical temperatures and pressures of n-alkylcyclohexanes with the number of carbon atoms in the side chain, normal boiling point, and molar mass have been obtained. The experimental critical constants of alkylcyclohexanes have been compared with the values calculated by the group-contribution methods of Lydersen, Joback and Reid, and Constantinou and Gani |
C 89 Critical Temperatures and Pressures of Straight-Chain Saturated Dicarboxylic Acids (C4 to C14) / E. D. Nikitin, A. P. Popov, N. S. Bogatishcheva, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2004. - Vol.49, №6. - С. 1515-1520 Рубрики: ФИЗИКА Кл.слова (ненормированные): DICARBOXYLIC ACIDS -- METHODS OF AMBROSE -- PRESSURES Аннотация: The critical temperatures and pressures of nine saturated straight-chain dicarboxylic acids HOOC(CH2)nCOOH with n = 2, 3, 4, 5, 6, 7, 8, 10, and 12 have been measured. All of the acids investigated are thermally unstable at their critical points. The method of pulse heating of a wire probe immersed in the liquid under study has been used. Residence times are from (0.01 to 1) ms. The experimental critical properties of dicarboxylic acids have been compared with the values calculated by the group-contribution methods of Ambrose, Joback, and Reid, Constantinou and Gani, and Marrero and Gani |
N 64 Nikitin, E. D. Using the phenomenon of liquid superheat to measure critical properties of substances / E. D. Nikitin, A. P. Popov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 200-204 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL TEMPERATURES -- R1(CH2)nR2 Аннотация: A method to measure the critical temperature and critical pressure of substances, in particular, thermally unstable ones, is briefly described. The method is used to measure the temperature of attainable superheat of liquids with the help of a wire probe heated by electric current pulses. As the pressure increases, the temperature of attainable superheat tends to a critical temperature. The duration of the heating pulses is from 0.03 to 1 ms. A list of about 130 substances for which measurements of the critical properties were made is presented. The results of these measurements confirmed the scaling form of the relation between the critical constants of substances consisting of long chain molecules and the number of molecular units. Two methods to extrapolate the experimental data for the critical properties of the initial members of homologous series to heavier polymer homologs are proposed. One of the methods is based on the equation of state for the fluid of chain molecules. In this method, the extrapolating equations are power series in n, where n is the number of main units in a chain molecule. In the other method, the hypothesis of functional self-similarity and the presentation of scaling behavior of the critical constants of long chain molecules are used. Homologous series with the general formula R1 (CH2)nR2, where R1 and R2 are different end groups, are considered. We obtain equations to calculate, with good accuracy, the critical temperature and critical pressure of any member of any homologous series with the molecule structure R1(CH2)nR2 if they are known for one compound belonging to this series |