Na_2B_4O_7-Na_2CO_3-NaHCO_3-NaBO_2-H_2O四元体系的等温溶度  

Isothermal Solubility of Na_2B_4O_7-Na_2CO_3-NaHCO_3-NaBO_2-H_2O System at 25,35and 45℃

作　　者：李君[1] 杨琴[1] 张逢星[1] 李恒欣[1] 王振军[1] 

机构地区：[1]西北大学化学系陕西省物理无机化学重点实验室,西安710069

出　　处：《物理化学学报》2001年第11期1045-1048,共4页Acta Physico-Chimica Sinica

摘　　要：测定了四元体系Na2B4O7Na2CO3NaHCO3NaBO2H2O在25、35及45℃时的等温溶度和饱和溶液的折光率绘制了相应的溶度图和组成折光率图.体系在35和45℃时有异成分化合物-天然碱(Na2CO3·NaHCO3·2H2O)生成.这些结果有助于揭示含硼碱湖的固体盐矿成因,对有关盐卤存在的反应2Na2CO3Na2B4O7+H2O=4NaBO2+2NaHCO3,揭示了相化学规律.Solubilities and refractive indices of saturated solutions of the syste m Na 2 B 4 O 7 -Na 2 CO 3 -NaHCO 3 -NaBO 2 -H 2 O have been investigated by isotherm al method at 25,35and 45℃.The comple x trona(Na 2 CO 3 ·NaHCO 3 ·2H 2 O)was found in the system,therefore,t here are 5monosaturated fields,7di saturated lines and 3invariant points:E 1t (Na 2 B 4 O 7 ·10H 2 O +NaBO 2 ·4H 2 O +Na 2 CO 3 ·nH 2 O),E 2t (Na 2 B 4 O 7 ·10H 2 O +Na 2 CO 3 ·NaHCO 3 ·2H 2 O +Na 2 CO 3 ·nH 2 O),E 3t (Na 2 B 4 O 7 ·10H 2 O +Na 2 CO 3 ·NaHCO 3 ·2H 2 O +NaHCO 3 ),at25℃,n=10;35℃,n=7;45℃,n=1.

关 键 词：溶度图 相平衡 四元体系 天然碱 硼酸盐 碳酸盐 硼酸钠 碳酸钠 等温溶液 相化学 盐湖 相图 

分 类 号：O642[理学—物理化学]