PRODUCTION OF DIURETHANE AND PRODUCTION OF DIISOCYANATE

Title:

PRODUCTION OF DIURETHANE AND PRODUCTION OF DIISOCYANATE

Document Type and Number:

Japanese Patent JPH07196594

Kind Code:

A

Abstract:

PURPOSE: To provide a method for producing a high purity (cyclic) aliphatic diurethane especially suitable for producing a (cyclic) aliphatic diisocyanate by the thermal cleavage of a urethane and method for producing the diisocyanate by using the diurethane.

CONSTITUTION: In a method for producing a high purity (cyclic) aliphatic diurethane from a (cyclic) aliphatic diamine, alcohol and urea by a multi-process reaction, (1) urea and alcohol are reacted and ammonia is released and (2) a diamine is subsequently introduced into the reaction mixture optionally in a form of a soln. in alcohol to perform reaction while releasing ammonia continuously and (3) the reaction mixture is freed from volatile components by distillation. The diurethane produced by this method is used as a starting substance in the production of the corresponding diisocyanate by the thermal cleavage of the urethane.

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Inventors:

OZUBUARUTO BUIRUMESU
EEBERUHARUTO KEENITSUHI
KURAUSU NAHATOKAMUPU
ERUNSUTO KIZERA

Application Number:

JP33091194A

Publication Date:

August 01, 1995

Filing Date:

December 09, 1994

Export Citation:

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Assignee:

BAYER AG

International Classes:

C07C263/04; C07C265/14; C07C269/04; C07C271/20; (IPC1-7): C07C271/20; C07C263/04; C07C265/14; C07C269/04

Attorney, Agent or Firm:

Kawahara Kazuho

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