EDTA-2Na对磷酸二氢铵连续稳态结晶过程的影响

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摘要针对目前工业上湿法磷酸生产高纯度磷酸二氢铵（MAP）过程中磷收率低、结晶母液利用困难以及晶体中金属离子含量高等问题，本研究提出螯合法生产高纯度MAP新工艺。在MAP结晶过程中加入螯合剂EDTA-2Na，螯合杂质金属离子，从而降低MAP晶体中杂质含量，提高MAP纯度。采用聚焦光束反射测量仪（FBRM）在线颗粒监测技术以及OptiMax全自动反应器的精确控温模块测定了溶解度和介稳区宽度等数据，分析了EDTA-2Na对MAP晶体的弦长分布、形貌和晶胞参数等的影响，系统研究了在生产过程中EDTA-2Na对MAP连续稳态结晶过程的影响。

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	邱可佳
	吴菁莉
	李小滨
	许德华
	张志业
	王辛龙

关键词： EDTA-2Na 磷酸二氢铵结晶添加剂

Abstract： Aiming at the problems of the production of high-purity monoammonium phosphate (MAP) by wet process phosphoric acid, such as low yield of phosphorus, difficult utilization of mother liquor and high content of metal ions in crystal, this research put forward a new method of chelation for producing high-purity MAP. Chelator EDTA-2Na was introduced to chelate metal ions to reduce the impurities in crystal during the process of MAP crystallization. In this paper, Focus beam reflectance measurement (FBRM) on-line particle monitoring technology and OptiMax automatic reactor with accurate temperature control module were used to measure the solubility and metastable zone width data. Additionally, the influence of EDTA-2Na on the chord length distribution, morphology, cell parameters of MAP crystal was analyzed, and the effect of EDTA-2Na on the continuous steady state crystallization of MAP was systematically studied.

Keywords： EDTA-2Na monoammonium phosphate crystallization additive

Received 2022-10-30;

Fund:国家自然科学基金（32172677），中央高校基本科研资金。

Corresponding Authors: 王辛龙,教授,E-mail:wangxl@scu.edu.cn。 Email: wangxl@scu.edu.cn

About author: 邱可佳(1999-),女,硕士研究生,现从事磷化工方面的研究。

引用本文:

邱可佳, 吴菁莉, 李小滨, 许德华, 张志业, 王辛龙.EDTA-2Na对磷酸二氢铵连续稳态结晶过程的影响[J]. 化学工业与工程, 2023,40(1): 72-80

QIU Kejia, WU Jingli, LI Xiaobin, XU Dehua, ZHANG Zhiye, WANG Xinlong.Influence of EDTA-2Na on continuous steady state crystallization of monoammonium phosphate (MAP)[J]. Chemcial Industry and Engineering, 2023,40(1): 72-80

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