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Title:
METHOD FOR PREPARING ISOCYANATE IN GASEOUS PHASE
Document Type and Number:
WIPO Patent Application WO/2020/132936
Kind Code:
A1
Abstract:
Disclosed is a method for preparing an isocyanate in a gaseous phase, comprising feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of < 1% before being subjected to the preheating and warming up, the substance A being a NCO group-containing substance and/or an olefinic double bond-containing substance. The method of the present invention can reduce the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process. Accordingly, clogging can be effectively ameliorated, a longer run cycle can be achieved, the frequency of overhaul of the phosgene-containing system can be reduced, and the safety in apparatus operation can be enhanced.

Inventors:
LI TONGHE (CN)
SHANG YONGHUA (CN)
SUN SHUCHANG (CN)
WANG JINGXU (CN)
HAN JINPING (CN)
LI QIANG (CN)
LI WENBIN (CN)
LI JING (CN)
WANG PENGFEI (CN)
LI YUAN (CN)
Application Number:
PCT/CN2018/123876
Publication Date:
July 02, 2020
Filing Date:
December 26, 2018
Export Citation:
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Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C07C263/10; C07C265/00
Foreign References:
CN101698652A2010-04-28
CN101747232A2010-06-23
CN101583594A2009-11-18
EP0593334B11997-05-28
EP0699657B12002-03-27
DE102009032413A2009-07-09
GB737442A1955-09-28
EP11160575A2011-03-31
DE102005037328A2005-08-04
Other References:
MA , DEQIANG ET AL: "Production and Technology Progress of Aliphatic Diisocyanates", PAINT & COATINGS INDUSTRY, vol. 35, no. 12, 31 December 2005 (2005-12-31), pages 35 - 41, XP055715228
Attorney, Agent or Firm:
BOSS&YOUNG PATENT AND TRADEMARK LAW OFFICE (CN)
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