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Title:
CYCLIC SOLVENT IN PHOSGENATION REACTION PRODUCTION AND IMPURITY REMOVAL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/077429
Kind Code:
A1
Abstract:
The present invention relates to the technical field of impurity separation in a phosgenation reaction process, and specifically relates to a cyclic solvent in phosgenation reaction production and an impurity removal method therefor. The impurity removal method comprises: (1) rectifying a crude solvent; (2) extracting a gas-phase material flow I from a tower top, and performing gas-liquid separation after condensation, the obtained liquid-phase material flow II flowing back to the tower top, and the obtained gas-phase material flow II entering a tail gas treatment system; (3) dividing the liquid phase material flow I extracted by a tower into a liquid-phase material flow III to return to the tower and a liquid-phase material flow IV to be sent to a solvent reaction kettle; and (4) adding an amine compound to the solvent reaction kettle to react with the liquid-phase material flow IV, the obtained material being subjected to solid-liquid separation, and the liquid product being directly reused as a cyclic solvent. The impurity removal method of the present invention can ensure that the total amount of amine consumption substances in a cyclic solvent is reasonably controlled, reduce the generation of a solid by-product in a phosgenation reaction, and relieve the blockage of raw materials in transportation and storage, thereby prolonging the stable running time of a device, and improving product quality.

Inventors:
WANG ZHENYOU (CN)
CHEN LIANGJIN (CN)
XU DAN (CN)
WEN FANG (CN)
WU XUEFENG (CN)
MA HAIYANG (CN)
ZHANG HONGKE (CN)
Application Number:
PCT/CN2020/121465
Publication Date:
April 21, 2022
Filing Date:
October 16, 2020
Export Citation:
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Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C07C263/18; C07C263/10
Domestic Patent References:
WO2020091867A12020-05-07
Foreign References:
CN101698652A2010-04-28
US4405527A1983-09-20
CN1993315A2007-07-04
CN101302174A2008-11-12
US4745216A1988-05-17
Attorney, Agent or Firm:
SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)
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