Title:
脂環式ジイソシアネートを連続的に製造するための多工程の方法
Document Type and Number:
Japanese Patent JP4499506
Kind Code:
B2
Abstract:
A cycloaliphatic diisocyanate is continuously prepared by reacting cycloaliphatic diamine(s) with carbonic acid derivative(s) and alcohol(s), to form a reaction mixture of cycloaliphatic diurethane(s); which are subsequently separated from low and medium boilers present in the reaction mixture and thermally cleaved to form cycloaliphatic diisocyanate(s). Continuous preparation of a cycloaliphatic diisocyanate, comprises: (a) reacting cycloaliphatic diamine(s) with carbonic acid derivative(s) and alcohol(s), to form a reaction mixture comprising cycloaliphatic diurethane(s); (b) separating the cycloaliphatic diurethanes from low and medium boilers present in the reaction mixture and thermally cleaving the diurethanes to form cycloaliphatic diisocyanate(s), while continuously discharging a portion of a cleavage residue formed by the separating; (c) removing high boiler components from the discharged cleavage residue; and (d) reurethanizing the purified discharge with alcohol, and recycling the reurethanized discharge into the process.
Inventors:
Stephan Cole Struk
Manfred Kretzing Ski
Liner Elm
Hans-Werner Micheltack
Manfred Kretzing Ski
Liner Elm
Hans-Werner Micheltack
Application Number:
JP2004240674A
Publication Date:
July 07, 2010
Filing Date:
August 20, 2004
Export Citation:
Assignee:
Evonik Degussa GmbH
International Classes:
C07C263/04; C07C263/06; C07C265/14
Domestic Patent References:
| JP6025136A | ||||
| JP2101057A |
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel