High-Temperature Equilibria and Critical Phenomena in the Na_2CO_3–NaCl–H_2O and Na_2CO_3–Na_2WO_4–H_2O Systems

摘要

Phase equilibria in the Na_2CO_3–NaCl–H_2O and Na_2CO_3–Na_2WO_4–H_2O ternary systems formed by type 1 salts (NaCl, Na_2WO_4) and a type 2 salt (Na_2CO_3) were experimentally studied at temperatures from 425 to 500℃ and pressures from 30 to 160 MPa with the contents of type 1 salts from 10 to 30 wt %. Transition from supercritical homogeneous fluid equilibria of the Na_2CO_3–H_2O system to heterogeneous equilibria of the title ternary systems was studied in the presence or absence of liquid phase immiscibility in the type 1 sub-systems.