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.
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Inventors:
WANG ZHENYOU (CN)
CHEN LIANGJIN (CN)
XU DAN (CN)
WEN FANG (CN)
WU XUEFENG (CN)
MA HAIYANG (CN)
ZHANG HONGKE (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:
Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C07C263/18; C07C263/10
Domestic Patent References:
WO2020091867A1 | 2020-05-07 |
Foreign References:
CN101698652A | 2010-04-28 | |||
US4405527A | 1983-09-20 | |||
CN1993315A | 2007-07-04 | |||
CN101302174A | 2008-11-12 | |||
US4745216A | 1988-05-17 |
Attorney, Agent or Firm:
SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)
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