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Title:
MULTI-STAGE METHOD FOR CONTINUOUSLY PRODUCING ALICYCLIC DIISOCYANATE
Document Type and Number:
Japanese Patent JP2005068147
Kind Code:
A
Abstract:

To provide a multi-stage method for continuously producing an alicyclic diisocyanate without containing phosgene.

This multi-stage method for continuously producing the alicyclic diisocyanate comprises synthesizing an alicyclic diurethane by reacting an alicyclic diamine and an alcohol with urea and/or a urea derivative, removing easily-boiling substances and intermediately-boiling substances from the diurethane, thermally decomposing the diurethane so as to isolate the desired diisocyanate, continuously discharging a part of a bottom reaction product of a decomposing column from a decomposing apparatus, separating a high-boiling component from the discharged product, re-urethanating the discharged product by using the alcohol, and recirculating the re-urethanated product in the above processes.


Inventors:
KOHLSTRUK STEPHAN
KRECZINSKI MANFRED
ELM RAINER DR
MICHALCZAK HANS-WERNER
Application Number:
JP2004240674A
Publication Date:
March 17, 2005
Filing Date:
August 20, 2004
Export Citation:
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Assignee:
DEGUSSA
International Classes:
C07C263/04; C07C263/06; C07C265/14; (IPC1-7): C07C263/04; C07C265/14
Domestic Patent References:
JPH0625136A1994-02-01
JPH02101057A1990-04-12
JPH0625136A1994-02-01
JPH02101057A1990-04-12
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel



 
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