Title:
A manufacturing method of Gia Min of diphenyl methane series, and polyamine
Document Type and Number:
Japanese Patent JP6279710
Kind Code:
B2
Abstract:
The invention relates to a method for producing diamines and polyamines of the diphenylmethane series in which, by using a coalescence auxiliary in the phase separation of the process product obtained in the scrubbing of the neutralized crude product, the fraction of water and thus also of water-soluble impurities in the organic MDA-containing phase is reduced. According to the invention, the coalescence auxiliary used is a filter bed made of coalescence fiber material. The di- and polyamines of the diphenylmethane series obtained after distillative purification of this MDA-containing organic phase are exceptionally suitable for the preparation of the corresponding isocyanates.
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Inventors:
Thomas, Knerf
Wolfgang, Lorenz
Stephan, Bellshofen
Richard, Adamson
Karsten, Becker
Wolfgang, Lorenz
Stephan, Bellshofen
Richard, Adamson
Karsten, Becker
Application Number:
JP2016506885A
Publication Date:
February 14, 2018
Filing Date:
April 08, 2014
Export Citation:
Assignee:
COVESTRO DEUTSCHLAND AG
International Classes:
C07C209/86; B01D17/022; C07C209/78; C07C211/50; C07C263/10; C07C265/14
Domestic Patent References:
| JP2006124392A | ||||
| JP51070295A |
Foreign References:
| US20060094897 |
Attorney, Agent or Firm:
Hiroyuki Nagai
Yukitaka Nakamura
Yasukazu Sato
Satoru Asakura
Hirohito Katsunuma
Hiroshi Sorimachi
Yuko Matsuyama
Yukitaka Nakamura
Yasukazu Sato
Satoru Asakura
Hirohito Katsunuma
Hiroshi Sorimachi
Yuko Matsuyama
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