Phase diagram for the system KVO3+NH4HCO3+NH4VO3+KHCO3+H2Oat303K

被引：6
作者：
Trypuc, M [1 ]
Kielkowska, U [1 ]
机构：
[1] Nicholas Copernicus Univ, Fac Chem, PL-87100 Torun, Poland
来源：
FLUID PHASE EQUILIBRIA | 2005年 / 230卷 / 1-2期
关键词：
solubility; phase diagram; KVO3; NH4HCO3; NH4VO3; KHCO3; H2O;
D O I：
10.1016/j.fluid.2004.11.027
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Solubility data of the KVO3 + NH4HCO3 + NH4VO3 + KHCO3 + H2O system at 303 K were determined under varying pressure conditions. The results were used to construct a phase diagram in the oblique projection according to Janecke's method. At constant p and T this diagram includes two invariant points, five double saturated liquid curves, and four crystallization fields corresponding to KVO3, NH4HCO3, NH4VO3, and KHCO3. It has been found that ammonium meta-vanadate is a sparingly soluble salt. NH4VO3 and KHCO3 compose the stable pair of salts, whereas KVO3 and NH4HCO3 form the unstable salt-pair. A thorough knowledge of the solubility phase diagram for this reciprocal quaternary salt system is the theoretical basis of the carbonation process of the potassium meta-vanadate saturated ammonia solution. (c) 2004 Elsevier B.V. All rights reserved.
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页码：99 / 104
页数：6
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