过硫酸铵冷却结晶过程研究

摘要针对工业生产中过硫酸铵从硫酸铵的电解液中结晶分离过程,研究了过硫酸铵在硫酸铵水溶液中的结晶热力学和动力学。首先,测定了(NH₄)₂S₂O₈-(NH₄)₂SO₄-H₂O体系在不同温度下的三元相图,为优化过硫酸铵冷却结晶工艺提供了热力学依据;此外,采用激光动态法测定了(NH₄)₂S₂O₈的结晶介稳区,研究了降温速率和搅拌速率对介稳区宽度的影响,计算了相关的成核动力学参数;最后,测定了(NH₄)₂S₂O₈在纯水中不同温度下的诱导期,并探究了诱导期与过饱和度之间的相关性。

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	张玉龙
	郭盛争
	赵建威
	张俊杰
	龚俊波

关键词：过硫酸铵冷却结晶三元相图诱导期介稳区

Abstract： In industry, ammonium persulfate was usually separated from the electrolyte of ammonium sulfate. This work is aiming at providing thermodynamic and dynamic data for the crystallization of ammonium persulfate in ammonium sulfate aqueous solution. Ternary phase diagrams of (NH₄)₂S₂O₈-(NH₄)₂SO₄-H₂O at different temperatures were firstly determined with isothermal solubility method, providing a thermodynamic basis for the optimization of the cooling crystallization of ammonium persulfate. In addition, laser method was applied to determine the supersolubility and the effects of cooling rate and stirring rate on the metastable zone widths of (NH₄)₂S₂O₈ were investigated, the nucleation kinetic parameters were calculated using the Self-consistent Nyvlt-like equation. Induction time of (NH₄)₂S₂O₈ nucleation in pure water at different temperatures were also measured to analyze the correlation of induction period and the supersaturation.

Keywords： ammonium persulfate cooling crystallization ternary phase diagram induction period metastable zone

Received 2021-03-15;

Corresponding Authors: 龚俊波,教授,E-mail:junbogong@tju.edu.cn。 Email: junbogong@tju.edu.cn

About author: 张玉龙 (1990-),男,硕士研究生,从事工业结晶方向的研究。

引用本文:

张玉龙, 郭盛争, 赵建威, 张俊杰, 龚俊波.过硫酸铵冷却结晶过程研究[J]. 化学工业与工程, 2022,39(3): 33-41

ZHANG Yulong, GUO Shengzheng, ZHAO Jianwei, ZHANG Junjie, GONG Junbo.Cooling crystallization process of ammonium persulfate[J]. Chemcial Industry and Engineering, 2022,39(3): 33-41

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