METHOD FOR PREPARING POLYISOCYANATE AND REACTION DEVICE THEREFOR

WIPO Patent Application WO/2022/147830

A1

Provided are a method for preparing a polyisocyanate, a polyisocyanate obtained by using the method, and a reaction device used in the method. The method comprises the following steps: 1) subjecting a polyamine solution and a phosgene solution to a cold reaction of a phosgenation reaction; and 2) further subjecting the material from step 1) to a hot reaction, wherein the amount of monofunctional impurities produced in step 1) is controlled such that the content of the monofunctional impurities in the final product is 0.1 ppm to 20000 ppm, and the amount of polyfunctional impurities produced in step 2) is controlled such that the content of the polyfunctional impurities in the final product is 0.1 ppm to 1000 ppm. In the present invention, by respectively controlling the contents of monofunctional impurities and polyfunctional impurities in the cold reaction stage and the hot reaction stage, respectively, a precise control of the solvent consumption amount can be achieved, thereby greatly reducing the energy consumption.

JPH0585701	AUTOTHERMAL STEAM REFORMING PROCESS
WO/2005/053834	SYNTHESIS FURNACE

WEN FANG (CN)
WU XUEFENG (CN)
XU DAN (CN)
MA HAIYANG (CN)
WANG ZHENYOU (CN)
ZHANG HONGKE (CN)
CHEN LIANGJIN (CN)
ZHAO DONGKE (CN)

PCT/CN2021/071091

July 14, 2022

January 11, 2021

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WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)

B01J8/06; C07C263/10; B01J8/10; B01J19/24; C07C265/14; C07D251/34

CN1729168A	2006-02-01
CN110327848A	2019-10-15
US3226410A	1965-12-28
CN104945283A	2015-09-30
CN108137488A	2018-06-08
EP2179985A1	2010-04-28
CN101698652A	2010-04-28

SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)

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