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Patent Searching and Data


Title:
PRODUCTION OF ISOPHORONE DIISOCYANATE
Document Type and Number:
Japanese Patent JPH07258195
Kind Code:
A
Abstract:

PURPOSE: To produce isophorone diisocyanate while preventing formation of aggregate, accordingly without causing a trouble related to operation by conducting phosgenation of isophorone diamine hydrochloride derived from isophorone diamine at a high temperature while controlling the weight concentration ratio of the compopents.

CONSTITUTION: This method for continuously producing (E) isophorone diisocyanate (IPDI) is carried out by using a continuous multi-stage reactor composed of (i) a hydrochloride production tank and (ii) two or more phosgene tanks continued therefrom and connected in series, feeding (A) isophorone diamine (IPDA), (B) hydrogen chloride and (C) an inert solvent to the reaction tank (i) to form (D) an isophorone diamine hydrochloride slurry and feeding the resultant slurry and phosgene to the reaction tank (ii). In this production method, the weight concentration ratio of IPDA to its monoisocyanate compound in the reaction mixture in the reaction tank (ii) is kept to 3 to 100 times on IPDI base. The reactions are conducted while keeping the temperature of the reaction tank (i) and the temperature of the reaction tank (ii) respectively to 80 to 120°C and 100 to 170°C.


Inventors:
SUGURO YOSHIO
KATOGI MAMORU
MATSUMOTO MASASHI
Application Number:
JP5042494A
Publication Date:
October 09, 1995
Filing Date:
March 22, 1994
Export Citation:
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Assignee:
MITSUBISHI CHEM CORP
International Classes:
C07C263/10; C07C265/14; (IPC1-7): C07C265/14; C07C263/10
Attorney, Agent or Firm:
Hasegawa Moji