Title:
ズレンジイソシアネートの製造方法
Document Type and Number:
Japanese Patent JP4750919
Kind Code:
B2
Abstract:
In the production of durene diisocyanate (I) from durene, the liquid phase from nitration with nitric acid in sulfuric acid is diluted with water. Dinitrodurene is extracted with an inert, water-immiscible, aprotic organic solvent and the solvent solution is separated and optionally washed and concentrated. Hydrogenation is carried out in the solution, using a solid, insoluble catalyst, then the diamine is phosgenated after separating water and catalyst. In the production of durene diisocyanate (I) by (1) reacting durene with nitric acid in sulfuric acid, (2) catalytic hydrogenation of the resultant dinitrodurene (II) and (3) phosgenation of the durene diamine (III): (a) the liquid phase from step (1) is diluted by mixing with water and (b) mixed intensively with a water-immiscible, aprotic organic solvent that is inert towards hydrogen to dissolve (II) in the solvent, then (c) the organic phase is separated and optionally purified by washing with water (d) the (II) solution, optionally concentrated by distillative separation of solvent, is hydrogenated, with addition of a solid, insoluble catalyst; (e) water and the catalyst are separated from the reaction mixture; and (f) (III) is phosgenated in the remaining solution.
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Inventors:
Peter Hight Chemper
Klaus Yost
Stephan Penninger
Klaus Yost
Stephan Penninger
Application Number:
JP36112699A
Publication Date:
August 17, 2011
Filing Date:
December 20, 1999
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
B01J25/02; C07B61/00; C07C263/10; C07C265/14
Domestic Patent References:
| JP6056749A |
Foreign References:
| US2864871 | ||||
| US3105845 | ||||
| US3153099 | ||||
| US4975516 |
Other References:
社団法人 日本化学会編,実験化学講座20 有機合成II-アルコール・アミン-,日本,丸善株式会社,1992年 7月 6日,第4版,p.279-281, 396-397, 473-483
Chemistry Letters ,1985年,(11),p.1671-1674
Chemistry Letters ,1985年,(11),p.1671-1674
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Einzel Felix-Reinhard
Takuya Kuno
Einzel Felix-Reinhard