Title:
イソシアネートを精製するための方法
Document Type and Number:
Japanese Patent JP2006510696
Kind Code:
A
Abstract:
Method for purifying isocyanates (I) by distillation. Method for purifying isocyanates by distillation comprises: (a) first separating a stream (1) containing (I), high and low boilers and non-evaporatable residue (X) by distillation (at least one theoretical plate) into a sidestream (2), containing (I) and (X), and a vapor stream (3), containing (I) and low boilers; (b) (X) in (2) is kept separate from (3) and/or material streams that consist at least partly of (3); (c) another (I)-containing vapor stream (4) is separated from (2), leaving stream (8) consisting essentially of (X); (d) streams (4) and (3) are separated by distillation into 3 streams (5,6,7) of different boiling ranges, where the lowest boiler (5) contains a significant proportion of the low boilers in (1), the highest boiler (7) contains a significant proportion of the high boilers in (1) and the middle stream (6) is essentially (I).
Inventors:
Andreas Werfeld
Hans-Jurgen Parasch
Eckhart Stroefer
Heinrich-Josef Blankerts
Hans-Jurgen Parasch
Eckhart Stroefer
Heinrich-Josef Blankerts
Application Number:
JP2004561304A
Publication Date:
March 30, 2006
Filing Date:
December 16, 2003
Export Citation:
Assignee:
BASF Aktiengesellschaft
International Classes:
C07C263/20; B01D1/22; B01D3/14; C07C263/10; C07C265/14
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel