KH2PO4 Production by Cooling Crystallization Using Its Phase Equilibrium in the KH2PO4-KCl-C2H5OH-H2O System

被引：5
|
作者：
Ren, Yongsheng [1 ]
Liu, Jiamin [1 ]
Ma, Jingjing [1 ]
Cai, Chao [1 ]
机构：
[1] Ningxia Univ, Sch Chem & Chem Engn, State Key Lab High Efficiency Coal Utilizat & Gre, 539 West Helanshan Rd, Yinchuan 750021, Peoples R China
来源：
CHEMICAL ENGINEERING & TECHNOLOGY | 2017年 / 40卷 / 07期
关键词：
Crystallization; Potassium dihydrogen phosphate; Potassium chloride; Solubility; SOLID-LIQUID EQUILIBRIUM; PLUS WATER; RAPID GROWTH; KDP; SOLUBILITY; 1-PROPANOL; MORPHOLOGY; ACID; NA+;
D O I：
10.1002/ceat.201600653
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Solid-liquid phase equilibrium and physicochemical properties of the KCl-KH2PO4-C2H5OH-H2O system at 313.15 K were investigated by the method of isothermal solution saturation, and the equilibrium solids were analyzed by Schreinemaker's method of wet residues and verified by XRD. Drowning-out precipitation of KH2PO4 was carried out by mixing different ethanolic aqueous solutions, and crystal morphology was observed by polarizing microscopy. The phase diagrams exhibit one eutonic point, two univariant curves, and crystallization regions corresponding to KCl and KH2PO4. At all studied ethanol concentrations, the crystallization region of KH2PO4 is larger than that of KCl. The effect of KCl (ethanol) on crystal growth morphology and KH2PO4 product quality was studied.
引用
收藏
页码：1332 / 1338
页数：7
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