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New experimental data on the chemical equilibrium of esterification in an acetic acid-ethanol-water-ethyl acetate system at 293.15 K and atmospheric pressure are presented. 相似文献
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V. M. Kuznetsov A. M. Toikka Yu. P. Kuznetsov 《Russian Journal of Applied Chemistry》2007,80(6):904-908
Results obtained in an experimental study of the pervaporation of binary solutions with a cellulose hydrate (cellophane) nonporous film membrane are discussed. A primary attention is given to the sorption and the effect of the residual pressure of the permeate on the separation characteristics. 相似文献
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Singularities of the systems with simultaneous phase and chemical equilibria were examined. The thermodynamic regularities were revealed and topology of phase diagrams was presented for multicomponent heterogeneous systems including two or several equilibrium liquid phases (solution layering). The thermodynamic conditions for displacement of phase and chemical equilibrium are considered. 相似文献
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Zvereva I. A. Popova V. F. Missyul' A. V. Toikka A. M. Gusarov V. V. 《Russian Journal of General Chemistry》2003,73(5):684-688
Studies on phase formation in the system Gd2O3-SrO-Al2O3 in the range 900-1530°C showed that the synthesis of Gd2SrAl2O7 occur by a mechanism differing from the mechanism of Ln2SrAl2O7 formation (Ln = La, Nd, Sm), and the limiting stage is reaction between Gd2O3 and SrAl2O4. 相似文献
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Alexandra Golikova Artemiy Samarov Maya Trofimova Sevastyan Rabdano Maria Toikka Oleg Pervukhin Alexander Toikka 《Journal of solution chemistry》2017,46(2):374-387
The chemical equilibrium (CE) for the quaternary reacting system ethanol–acetic acid–ethyl acetate–water was studied at 303.15, 313.15 and 323.15 K and atmospheric pressure. The CE compositions were determined by gas chromatography and nuclear magnetic resonance analytical methods. The thermodynamic constants of CE at 303.15, 313.15 and 323.15 K were calculated based on the obtained experimental data with the use of the NRTL model. 相似文献
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Zvereva I. A. Popova V. F. Vagapov D. A. Toikka A. M. Gusarov V. V. 《Russian Journal of General Chemistry》2001,71(8):1181-1185
Phase formation in the La2O3-SrO-Al2O3 system was studied. Formation of the perovskite LaAlO3 structure and the perovskite-like LaSrAlO4 and La2SrAl2O7 layered structures in solid-phase chemical reactions is activated only after reaching certain critical temperatures which correlate with the temperatures of of the transition of intergranular formations to the liquid-like state (melting points of two-dimensional nonautonomous phases). 相似文献
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T. K. Meleshko A. Yu. Pulyalina N. S. Tyan G. A. Polotskaya I. V. Ivanov N. V. Kukarkina A. M. Toikka A. V. Yakimansky 《Polymer Science Series B》2017,59(2):183-193
Samples of molecular polyimide brushes with poly(methyl methacrylate) side chains with substantially different grafting densities and lengths of side chains are obtained by the atom-transfer radical polymerization of methyl methacrylate using samples of polyimide multicenter macroinitiators with different contents of initiation groups. Strong homogeneous films suitable for use as diffusion membranes for pervaporation separations of liquid mixtures are cast from solutions of polyimide brushes in dimethylformamide. Investigations are performed for films of polyimide brushes with loosely grafted short side chains or densely grafted long side chains as well as for films of a polyimide identical in its chemical structure to the backbone of polyimide brushes. It is shown that all film membranes sorb water moderately and do not sorb isopropanol. For membranes made of the polyimide and the loosely grafted brush, which is close to the polyimide in its properties, the active sorption of acetonitrile is demonstrated. It is found that all membranes exhibit high selectivities for water upon pervaporation of water–isopropanol mixtures. In addition, membranes made of the brush with densely grafted side chains show high productivity. 相似文献
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Experimental data on the solubility in the system constituted by acetic acid, n-propanol, water, and n-propyl acetate at 313.15 K are presented. The position of the critical curve for the liquid-liquid equilibrium, including that of the critical points on the chemical equilibrium surface, is discussed. 相似文献