Preparation of Monoammonium Phosphate by Autothermal Crystallization in a Microreactor
1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2. College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：In this paper, a new process, namely autothermal crystallization, was proposed to prepare high purity solid monoammonium phosphate (MAP) in a microreactor with low energy consumption. The principle of the process was understood more thoroughly by the study of heat release, water vaporization and the inner crystallization phenomena in the process of preparation of MAP from autothermal crystallization in the microreactor, which provided fundamental data and theoretical support for microreactor design and parameter optimization. At the molar ratio of acid to base 1:1 and the concentration of MAP (cMAP) of 33.2%-55.0%(w), a high crystallization yield of 40% was achieved, and the as-prepared MAP possessed small crystallite size and high purity. The experiments showed that this method can effectively reduce the energy consumption while maintaining a high yield, indicating that the process had great potential in the industrial production of solid MAP.
Zhang Yuchao 1,3,Dong Zhengya 1 et al. Preparation of Monoammonium Phosphate by Autothermal Crystallization in a Microreactor[J]. 化学反应工程与工艺, 2016, 32(5): 392-399.
