Title:
METHOD FOR COMPREHENSIVE RECYCLING OF BY-PRODUCT SLURRY DURING POLYPHENYLENE SULFIDE PRODUCTION
Document Type and Number:
WIPO Patent Application WO/2018/072739
Kind Code:
A1
Abstract:
Disclosed is a method for comprehensive recycling of a by-product slurry during polyphenylene sulfide (PPS) production. Na2CO3 is added to the slurry, and then a solvent NMP is recovered by distillation and drying, then an acid solution is used for dissolving and leaching the resulting dry waste salt, the leaching liquor is subjected to pH adjustment and then filtered, with the insoluble components being removed, the liquid phase is subjected to adsorption and purification and evaporation concentration to separate out NaCl, then Na2CO3 is added to the solution with NaCl separated out for precipitation to obtain Li2CO3, the mother liquor with lithium precipitated is subjected to pH adjustment and then mixed with the solution obtained after adsorption and purification, and a closed circulation of the process is achieved. The method can be used in the comprehensive recycling of the by-product slurry during PPS production, the recovered NaCl can be directly used for caustic soda preparation by ionic membrane electrolysis, and Li2CO3 can directly serve as an industrial product or can be further converted into LiCl to serve as a PPS production auxiliary for recycling.
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Inventors:
DENG TIANLONG (CN)
YU XIAOPING (CN)
LI QIANHUA (CN)
LV TIANSHENG (CN)
HU HONGMING (CN)
GUO YAFEI (CN)
WANG SHIQIANG (CN)
LI LONG (CN)
CHEN SHANGJING (CN)
XIE XIAOHONG (CN)
ZHANG SISI (CN)
YU XIAOPING (CN)
LI QIANHUA (CN)
LV TIANSHENG (CN)
HU HONGMING (CN)
GUO YAFEI (CN)
WANG SHIQIANG (CN)
LI LONG (CN)
CHEN SHANGJING (CN)
XIE XIAOHONG (CN)
ZHANG SISI (CN)
Application Number:
PCT/CN2017/106950
Publication Date:
April 26, 2018
Filing Date:
October 20, 2017
Export Citation:
Assignee:
TIANJIN UNIV OF SCIENCE AND TECHNOLOGY (CN)
CHONGQING JUSHI NEW MATERIAL TECH CO LTD (CN)
CHONGQING JUSHI NEW MATERIAL TECH CO LTD (CN)
International Classes:
C08G75/0277; C01D3/14; C01D15/08; C07D207/267; C08G75/0213; C08G75/0254; C08G75/0281
Foreign References:
| CN1345892A | 2002-04-24 | |||
| CN105836767A | 2016-08-10 | |||
| CN105347364A | 2016-02-24 | |||
| CN106565956A | 2017-04-19 |
Attorney, Agent or Firm:
TIANJIN WISELY INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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