HEAT-EXCHANGER MEDIUM FOR THERMAL DECOMPOSITION OF CARBAMIC ACID ESTER

Title:

HEAT-EXCHANGER MEDIUM FOR THERMAL DECOMPOSITION OF CARBAMIC ACID ESTER

Document Type and Number:

Japanese Patent JPH09249633

Kind Code:

A

Abstract:

To carry out thermal decomposition of a carbamic acid ester using a high-boiling inert heat-stable solvent having a prescribed boiling point or a narrow boiling range as a heat-exchanger medium.

(A) A carbamic acid ester is decomposed under a decomposition condition in the presence of (B) a solvent obtained as an evaporation fraction of a heat-stable liquid having a prescribed boiling point or a boiling range of <10°C under the decomposition pressure. The solvent of the component B is preferably a high-boiling distillation fraction of a thermal medium oil selected from a partially hydrogenated terphenyl, dibenzylbenzene, phenoxybiphenyl and o-phenoxybiphenyl having a boiling range of <3°C under the operation pressure. The decomposition reaction is preferably carried out in a reactive fractionation column.

Inventors:

DEIITAA SHIYUREENSHIYUTAIN
KURISUCHIAN RASUPU
GEORUGU RONGE
OZUWARUDO UIRUMESU

Application Number:

JP7671597A

Publication Date:

September 22, 1997

Filing Date:

March 13, 1997

Export Citation:

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Assignee:

BAYER AG

International Classes:

C07C263/04; C07C265/04; C07C265/14; C07C269/06; C07C271/20; (IPC1-7): C07C263/04; C07C265/04; C07C265/14; C07C269/06; C07C271/20

Attorney, Agent or Firm:

Kazuho Kawarada (1 person outside)

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