Title:
液相及び気相ホスゲン化によるMDIの製造方法
Document Type and Number:
Japanese Patent JP2008534550
Kind Code:
A
Abstract:
The invention relates to a process for preparing isocyanates, which comprises the ( 1 ) preparation of a crude MDA mixture by reaction of aniline with formaldehyde, ( 2 ) separation of the crude MDA mixture into MMDA and PMDA, ( 3 a) phosgenation of the PMDA separated off in step 2 in the liquid phase to form PMDI and ( 3 b) phosgenation of the MMDA separated off in step 2 in the gas phase to form MMDI.
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Inventors:
Muller, Christian
Streffer, Eckhart
Streffer, Eckhart
Application Number:
JP2008503483A
Publication Date:
August 28, 2008
Filing Date:
March 22, 2006
Export Citation:
Assignee:
BASF SE
International Classes:
C07C263/10; C07C265/14; C07B61/00
Attorney, Agent or Firm:
Satoshi Eto