Study of metastable equilibria in the ternary system NH4H2PO4-(NH4)2HPO4-H2O at -7 and -9°C

被引：9
|
作者：
El Hattab, Z. [1 ]
Zerrouk, L. [1 ]
Jourani, A. [1 ]
Kaddami, M. [1 ]
机构：
[1] Univ Hassan 1, Fac Sci & Technol, Lab Phys Chem Proc & Mat, Settat, Morocco
来源：
FLUID PHASE EQUILIBRIA | 2013年 / 354卷
关键词：
Ternary system; Phase diagram; Metastable equilibrium; Liquid fertilizers; Ammonium phosphate monobasic; Ammonium phosphate dibasic;
D O I：
10.1016/j.fluid.2013.06.026
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The solid-liquid phase equilibria of the ternary system H2O-NH4H2PO4-(NH4)(2)HPO4 were studied under air pressure using a synthetic method based on conductivity measurements. Two isotherms were set at -7 and -9 degrees C. Two branches of solubility, stable and metastable, have been identified. The solid phases which lay out stable equilibria with the liquid are: alpha-NH4H2PO4, beta-NH4H2PO4, (NH4)(2)HPO4 center dot 2H(2)O and ice. Only (NH4)(2)HPO4, which is a solid phase, makes up a metastable equilibrium at this temperature. (C) 2013 Published by Elsevier B.V.
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页码：47 / 53
页数：7
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