Na2SO4–NaCl–H2O system with a binary homogeneous critical point: Phase equilibria at 475–520°C and to 130 MPa
| Autor: | M. A. Urusova, V. M. Valyashko |
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| Rok vydání: | 2017 |
| Předmět: |
Ternary numeral system
Chromatography Chemistry Materials Science (miscellaneous) Critical phenomena Binary number 010402 general chemistry 010403 inorganic & nuclear chemistry 01 natural sciences Critical point (mathematics) 0104 chemical sciences Inorganic Chemistry Crystallography Homogeneous Physical and Theoretical Chemistry |
| Zdroj: | Russian Journal of Inorganic Chemistry. 62:843-853 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s0036023617060250 |
| Popis: | Phase equilibria were studied at temperatures 475–520°C and a pressure to 130 MPa in the ternary system Na2SO4–NaCl–H2O with boundary binary subsystems of two types. In type 1 subsystems (the NaCl–H2O subsystem in this work), there are no critical phenomena in saturated solutions. Type 2 subsystems (the Na2SO4–H2O subsystem in this work) have terminal critical points p (G = L – $${S_{N{a_2}S{O_4}}}$$ ) and Q (L1 = L2 – $${S_{N{a_2}S{O_4}}}$$ ). It was shown that the ternary system contains two regions of three-phase equilibria ((G–L–S) and (L1–L2–S)), divided by a two-phase fluid region (F – $${S_{N{a_2}S{O_4}}}$$ ), and two types of monovariant critical curves ((G = L – $${S_{N{a_2}S{O_4}}}$$ ) and (L1 = L2 – $${S_{N{a_2}S{O_4}}}$$ )). With increasing temperature, these three-phase regions approach each other until the two-phase fluid equilibrium vanishes and the monovariant critical curves meet at a binary homogeneous critical point (G = L–S ⇔ L1 = L2 – $${S_{N{a_2}S{O_4}}}$$ ) at a maximal temperature of ~495°C and a pressure of ~75 MPa. |
| Databáze: | OpenAIRE |
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