三元体系MgCl_2-CO(NH_2)_2-H_2O在25℃时的等温溶度与新相研究  

Studies on the Isothermal Solubility and the New Phases in the Ternary System MgCl 2 CO(NH 2) 2 H 2O at 25 ℃

作　　者：张逢星[1,2] 魏小兰[1,2] 郭志箴[1,2] 史启祯 

机构地区：[1]西北大学化学系 [2]华南理工大学应用化学系

出　　处：《高等学校化学学报》1998年第9期1449-1452,共4页Chemical Journal of Chinese Universities

基　　金：陕西省教委专项科研基金

摘　　要：测定了２５℃时三元体系ＭｇＣｌ２－ＣＯ（ＮＨ２）２－Ｈ２Ｏ的等温溶度及饱和溶液的折光率和密度，且绘制成溶度图和性质－组成图．在三元体系内形成２个三元化合物新相：ＭｇＣｌ２·ＣＯ（ＮＨ２）２·４Ｈ２Ｏ（记作Ａ）和ＭｇＣｌ２·４ＣＯ（ＮＨ２）２·２Ｈ２Ｏ（记作Ｂ），Ｂ为新化合物．三元体系的溶度图由４支单饱和线［对应单饱和固相为ＭｇＣｌ２·６Ｈ２Ｏ、三元化合物Ａ和Ｂ、ＣＯ（ＮＨ２）２］组成，这４支单饱和线两两交于３个三元无变点［对应双饱和固相为ＭｇＣｌ２·６Ｈ２Ｏ＋Ａ、Ａ＋Ｂ、Ｂ＋ＣＯ（ＮＨ２）２］．The solubilities and refractive indices, densities of the saturated solutions in the title ternary system have been investigated isothermally at 25 ℃. In the ternary system, there are two new phases being formed, MgCl 2\5CO(NH 2) 2\54H 2O(compound A) and MgCl 2\54CO(NH 2) 2\52H 2O(compound B). Compound B is found for the first time. The two compounds are characterized by IR spectra, DTA, DSC, X Ray diffraction etc. The solubility diagram is consisted of four crystallization surfaces corresponding to MgCl 2·6H 2O, ternary compounds A, B and CO(NH 2) 2, and three invariant points corresponding to the eutectic solutions saturated with MgCl 2·6H 2O+A, A+B, B+CO(NH 2) 2.

关 键 词：三元体系 相平衡 氯化钾 氯化镁 脲 溶度 新相 

分 类 号：O642.42[理学—物理化学]