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Title:
脂肪族イソシアネートの製造方法
Document Type and Number:
Japanese Patent JP4541685
Kind Code:
B2
Abstract:
Preparation of aliphatic isocyanates from the corresponding aromatic isocyanates comprises urethanization of the aromatic isocyanate, hydrogenation of the urethane with hydrogen in the presence of a supported ruthenium catalyst having a BET surface area of 30-70 m2/g and greater than 50% of the pore volume comprising macropores having a pore diameter of greater than 50 nm and cleavage of the hydrogenated urethane to the aliphatic isocyanate. A process for the preparation of aliphatic isocyanates from the corresponding aromatic isocyanates having at least one aromatic ring and one or more isocyanates bonded directly or indirectly to at least one aromatic ring comprises: (a) urethanization of the aromatic isocyanate; (b) hydrogenation of the aromatic urethane with hydrogen in the presence of a supported catalyst (I) comprising 0.01-20 wt.% ruthenium, optionally with at least one Group 1, 7 or 8 metal as the active metal on a support having a BET surface area of 30-70 m2/g and greater than 50% of the pore volume comprising macropores having a pore diameter of greater than 50 nm and less than 50% mesopores having a pore diameter of 2-50 nm and; (c) cleavage of the hydrogenated urethane to the aliphatic isocyanate.

Inventors:
Stephan Cole Struk
Manfred Kretzynski
Christian lettman
Guido stohoniol
Emanuil Spiro
Norbert Finke
Liner romeder
Application Number:
JP2003388494A
Publication Date:
September 08, 2010
Filing Date:
November 18, 2003
Export Citation:
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Assignee:
Evonik Degussa GmbH
International Classes:
B01J35/04; B01J23/46; C07B61/00; C07C263/04; C07C263/16; C07C265/10; C07C265/14
Foreign References:
DE4407019A1
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel