磷酸二氢钾结晶热力学数据的测定及应用研究

doi:10.11962/1006-4990.2020-0082

Abstract

Abstract:

The solubility and super solubility of potassium dihydrogen phosphate in water were measured by equilibrium method and laser method,and the data of the metastable zone were obtained.Combined with the evaporation crystallization process of potassium dihydrogen phosphate industrial unit,the application of experimental data of crystallization thermodyna-mics in the production of potassium dihydrogen phosphate was discussed,and the optimal industrial crystallization operating conditions were obtained.For the production capacity of 1 000 kg/h potassium dihydrogen phosphate,the best industrial opera-ting conditions were as follows: feed liquid circulation volume was 50.4 m³/h,heating steam consumption was 1 932 kg/h and vacuum degree of the evaporator was 0.067 MPa.Performing the crystallization operation according to the determined process conditions can overcome powdery crystallization and obtain high-quality crystalline products with uniform particle size.

Key words: potassium dihydrogen phosphate, crystallization thermodynamics, solubility, super solubility, industrial applica-tion

CLC Number:

TQ131.13

Liu Juexin,Zheng Chenggang,Ye Shichao. Determination and application of thermodynamic data of potassium dihydrogen phosphate crystal[J]. Inorganic Chemicals Industry, 2021, 53(1): 62-64.

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References 15

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饱和温度/K	溶解度/g	自发结晶温度/K	最大过冷温度/K	饱和温度/K	溶解度/g	自发结晶温度/K	最大过冷温度/K
311.95	34.16	301.35	10.60	342.45	63.32	338.25	4.20
320.15	41.36	312.25	7.90	348.15	70.25	344.81	3.34
327.25	46.88	320.95	6.30	351.75	74.38	348.95	2.80
336.65	57.04	331.85	4.80

料液带入水量/（kg·h^-1）	反应生成水量（kg·h^-1）	汽化水量（kg·h^-1）	母液返料量/ （m³·h^-1）	料液循环量（m³·h^-1）
1 682	132	1 814	3.55	50.4
结晶器温度/K	加热器出口温度/K	加热器蒸汽量（kg·h^-1）	蒸发器真空度/MPa
348.15	368.15	1 932	0.067

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Determination and application of thermodynamic data of potassium dihydrogen phosphate crystal

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