Title:
イソシアネートの製造方法
Document Type and Number:
Japanese Patent JP5085971
Kind Code:
B2
Abstract:
Isocyanates are produced by
a) reacting at least one amine with phosgene, optionally in the presence of a solvent to produce the corresponding isocyanate and a stream containing hydrogen chloride, phosgene and optionally solvent, low-boiling compounds and inert substances is obtained,
b) separating the stream containing hydrogen chloride, phosgene and optionally solvent, low-boiling compounds and inert substances in an at least two-stage sequence of absorption steps that includes (1) at least one isothermal absorption step and (2) at least one adiabatic absorption step, to obtain (i) a hydrogen chloride stream containing phosgene in concentrations of at most 0.5 wt.% (based on the weight of the hydrogen chloride stream) and (ii) a liquid phosgene stream, and
c) recycling the liquid phosgene stream (ii) to the reaction of amine with phosgene.
Inventors:
Wolfgang Lorenz
Matthias Böhm
Bill bloody
Donald Feldehart
Matthias Böhm
Bill bloody
Donald Feldehart
Application Number:
JP2007114351A
Publication Date:
November 28, 2012
Filing Date:
April 24, 2007
Export Citation:
Assignee:
Bayer MaterialScience LLC
International Classes:
C07C263/10; C07C263/20; C07C265/02; C07C265/12
Domestic Patent References:
| JP2006510695A | ||||
| JP2006510692A |
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Einzel Felix-Reinhard
Takuya Kuno
Einzel Felix-Reinhard