Title:
気相中でのイソシアネートの製造法
Document Type and Number:
Japanese Patent JP5574691
Kind Code:
B2
Abstract:
Preparing meta-toluene diisocyanate comprises reacting meta-toluenediamine with phosgene in the gas phase, where: the meta-toluenediamine and phosgene are separately added into a reactor, and a gaseous meta-toluenediamine is produced by evaporation in an evaporator; in the evaporator, the liquid meta-toluenediamine contains less than 0.5 wt.% of toluene diamine residues, less than 0.2 wt.% of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals; and the meta-toluenediamine is partially evaporated in the evaporator, and 0.1 wt.% of meta-toluenediamine is not evaporated. Preparing m-toluene diisocyanate comprises reacting meta-toluene diamine with phosgene in the gas phase, where: the meta-toluenediamine and phosgene are separately added into a reactor, and a gaseous meta-toluene diamine is produced by evaporation in an evaporator; in the evaporator, the liquid meta-toluenediamine contains less than 0.5 wt.% of toluene diamine residues, less than 0.2 wt.% of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals; the ratio between the quantity of liquid (kg) present in the evaporator and the gas stream (kg/h) leaving the evaporator is less than 2 hours; the meta-toluenediamine is partially evaporated in the evaporator, and at least 0.1 wt.% of meta-toluene diamine is not evaporated; the unevaporated amount of meta-toluenediamine is not added into the reactor; and the meta-toluenediamine is thermally treated at at least 100[deg] C for at least 15 minutes, before adding into the evaporator and then the resulting ammonia is separated.
Inventors:
Clowes Screw coupe
Liner ブルンス
ヴォルフガング Lorentz
Lars Per Deken
Bernd ペネマン
Fritz Pole
Andreas Roush
Fleet Helm シュテ fence
Liner ブルンス
ヴォルフガング Lorentz
Lars Per Deken
Bernd ペネマン
Fritz Pole
Andreas Roush
Fleet Helm シュテ fence
Application Number:
JP2009284086A
Publication Date:
August 20, 2014
Filing Date:
December 15, 2009
Export Citation:
Assignee:
Beyer Material science Aktiengesellschaft Bayer MaterialScience AG
International Classes:
C07C263/10; C07C265/14
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Takahashi Yoshi size
Star Kimihiro
Hiroyasu Ninomiya
アインゼル Felix-Reinhardt
Takuya Kuno
Takahashi Yoshi size
Star Kimihiro
Hiroyasu Ninomiya
アインゼル Felix-Reinhardt