Polythermal study of phase equilibria, solubility and critical phenomena in the ternary system cesium nitrate – water – polyethylene glycol-1500

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Abstract

Phase equilibria and solubility were studied by the visual-polythermal method in mixtures of components along ten sections of the composition triangle in the range of 10–110°C in the ternary system cesium nitrate – water – polyethylene glycol-1500. Using the method of volume ratio of liquid phases, the temperature of formation of the critical node of the monotectic state (78.8°C) and the dependence of the compositions of solutions corresponding to the critical solubility points of the separation region on temperature were found. The solubility of the components was determined and isothermal phase diagrams of the studied ternary system were constructed at 10.0, 25.0, 40.0, 50.0, 78.8, 90.0, and 100.0°C. It has been established that in the range of 10.0–40.0°С on isothermal diagrams there is a triangle of the eutonic state. Above the temperature of the onset of delamination (78.8°C), a monotectic triangle with adjacent fields of saturated solutions and delamination is realized on the isotherms. The distribution coefficient of polyethylene glycol-1500 between the equilibrium liquid phases of the monotectic state in the range of 78.8–100.0°C was calculated. It has been established that cesium nitrate is effective as a salting out agent for polyethylene glycol-1500 at temperatures above 90.0°C. At all temperatures in the study interval, polyethylene glycol-1500 significantly reduces the solubility of cesium nitrate in water.

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About the authors

D. G. Cherkasov

Saratov National Research State University

Author for correspondence.
Email: dgcherkasov@mail.ru
Russian Federation, Saratov, 410012

Y. S. Klimova

Saratov National Research State University

Email: dgcherkasov@mail.ru
Russian Federation, Saratov, 410012

V. V. Danilina

Saratov National Research State University

Email: dgcherkasov@mail.ru
Russian Federation, Saratov, 410012

K. K. Ilin

Saratov National Research State University

Email: dgcherkasov@mail.ru
Russian Federation, Saratov, 410012

K. E. Zubarev

Saratov National Research State University

Email: dgcherkasov@mail.ru
Russian Federation, Saratov, 410012

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Supplementary files

Supplementary Files
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2. Fig. 1. Results of full-profile analysis of the CsNO₃ diffraction pattern (green curve). Peak positions according to the processing results (blue curve) and according to PDF # 01-077-2264 (CsNO₃, space group P31, red curve).

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3. Fig. 2. Polytherms of phase states of mixtures of components in sections IV, VI and IX of the triangle of compositions of the cesium nitrate–water–polyethylene glycol-1500 system.

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4. Fig. 3. Dependences of the content of a mixture of PEG-1500 with water and cesium nitrate at the point of contact of four fields of phase states (l, l + S, l + S₁, l + S + S₁) on sections V–VIII of the ternary system cesium nitrate–water–PEG-1500 on temperature.

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5. Fig. 4. Dependences of the content of cesium nitrate and PEG-1500 in critical solutions on temperature in the ternary system cesium nitrate–water–polyethylene glycol-1500.

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6. Fig. 5. Isotherms of phase states (wt.%) of the ternary system cesium nitrate–water–polyethylene glycol-1500 at 10.0, 25.0 and 40.0°C.

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7. Fig. 6. Isotherms of phase states (wt.%) of the ternary system cesium nitrate–water–polyethylene glycol-1500 at 50.0, 78.8, 90.0 and 100.0°C.

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