Environment·Health·Safety

Investigation on removal process of sodium carbonate from methionine saponification solution using cooling crystallization

  • Zhongxin Fei ,
  • Liang Zhu ,
  • Jingxin Zhao ,
  • Yanfei Wang ,
  • Libin Yang ,
  • Zuoliang Sha ,
  • Xiaoyu Zhao
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  • Tianjin Key Laboratory of marine Resources and Chemistry,College of Chemical Engineering and Materials Science,Tianjin University of Science & Technology Department of chemical engineering,Tianjin 300457,China

Received date: 2019-03-28

  Online published: 2020-06-10

Abstract

The cooling crystallization and alkaline removing process of methionine saponification solution was studied.The effects of crystallization parameters,such as cooling final temperature,cooling rate and seed addition amount,on the purity and removal rate of sodium carbonate from decahydrate of crystallization products were systematically investigated.Experimental results showed that the removal rate of sodium carbonate decreased gradually with the increase of the cooling terminal temperature. Meanwhile,the purity of sodium carbonate decahydrate increased firstly and then remained almost unchanged.As the cooling rate increases,the purity of sodium carbonate decahydrate decreased gradually,and the removal rate of sodium carbonate did not change much.With the increase of the number of crystal seeds of sodium carbonate decahydrate,the purity of sodium carbonate decahydrate increased first and then decreased,and the removal rate of sodium carbonate was almost unchanged.Optimization of process conditions were obtained: the cooling rate of 0.05 ℃/min,seed addition amount of 7.5%(based on the quality of the crystalline product),the terminal temperature of frozen for-10 ℃. Under the conditions,the crystal purity of sodium carbonate decahydrate was 96.41%,and the removal rate of sodium carbonate in saponification solution was 81.2%.

Cite this article

Zhongxin Fei , Liang Zhu , Jingxin Zhao , Yanfei Wang , Libin Yang , Zuoliang Sha , Xiaoyu Zhao . Investigation on removal process of sodium carbonate from methionine saponification solution using cooling crystallization[J]. Inorganic Chemicals Industry, 2019 , 51(9) : 81 -84 . DOI: 10.11962/1006-4990.2018-0573

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