K_2CO_3-Na_2CO_3-Li_2CO_3-H_2O四元体系288K的相平衡  

A Study on the Phase Equilibrium of the Quaternary System K_2CO_3-Na_2CO_3-Li_2CO_3-H_2O at 288 K

作　　者：桑世华[1] 唐明林[1] 殷辉安[1] 曾英[1] 

机构地区：[1]成都理工大学材料与生物工程学院,成都610059

出　　处：《应用化学》2004年第5期509-511,共3页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金 (4 9773 2 0 0 )资助课题

摘　　要：The solubilities and properties such as density, electrical conductivity and pH of the solutions in the quaternary system K2CO3-Na2CO3-Li2CO3-H2O at 288 K have been studied by isothermal equilibrium method. Based on the solubility data, the phase diagram of the system was obtained, which comprises two invariant points E and F and five uninvariant curves E3E, E4E, E1F, E2F and EF. The four stationary phases in crystallization regions are K2CO3·3/2H2O, Na2CO3·10H2O, NaKCO3·6H2O and Li2CO3. The composition of the solution corresponding to E is ω（K2CO3）= 51.34%, ω（Na2CO3）=2.94%, ω（Li2CO3）=0.21% and the equilibrium solids are K2CO3· 3/2H2O+NaKCO3·6H2O+Li2CO3. The composition of the solution for F is ω（K2CO3）=15.19%, ω（Na2CO3）=13.62%, ω（Li2CO3）=0.70% and the equilibrium solids are Na2CO3· 10H2O+NaKCO3·6H2O+Li2CO3. Potassium carbonate has strong salting-out effect on Na2CO3 and Li2CO3. The physico-chemical properties of the system have been discussed briefly.The solubilities and properties such as density, electrical conductivity and pH of the solutions in the quaternary system K_2CO_3-Na_2CO_3-Li_2CO_3-H_2O at 288 K have been studied by isothermal equilibrium method. Based on the solubility data, the phase diagram of the system was obtained, which comprises two invariant points E and F and five uninvariant curves E3E, E4E, E1F, E2F and EF. The four stationary phases in crystallization regions are K_2CO_3·3/2H_2O, Na_2CO_3·10H_2O, NaKCO_3·6H_2O and Li_2CO_3. The composition of the solution corresponding to E is ω(K_2CO_3)= 51.34%, ω(Na_2CO_3)=2.94%, ω(Li_2CO_3)=0.21% and the equilibrium solids are K_2CO_3· 3/2H_2O+NaKCO_3·6H_2O+Li_2CO_3. The composition of the solution for F is ω(K_2CO_3)=15.19%, ω(Na_2CO_3)=13.62%, ω(Li_2CO_3)=0.70% and the equilibrium solids are Na_2CO_3· 10H_2O+NaKCO_3·6H_2O+Li_2CO_3. Potassium carbonate has strong salting-out effect on Na_2CO_3 and Li_2CO_3. The physico-chemical properties of the system have been discussed briefly.

关 键 词：水盐体系 相平衡 碳酸盐 溶解度 盐湖卤水 

分 类 号：O642.42[理学—物理化学] TQ013.1[理学—化学]