CONTINUOUS PREPARATION OF ORGANIC ISOCYANATE

Title:

CONTINUOUS PREPARATION OF ORGANIC ISOCYANATE

Document Type and Number:

Japanese Patent JPH08225510

Kind Code:

A

Abstract:

To obtain the subject isocyanate continuously and in a high yield by circulating a reaction mixture of a specific amine and phosgene through a bubbling column in an organic solvent.

This method for preparing an organic isocyanate is provided by circulating a reaction mixture through a bubbling column at approximately 60-100°C temperature for reacting at least one kind primary amine (e.g.: toluylenediamine) with phosgene in the presence of an inert organic solvent (e.g.; chlorobenzene) in (100:1)-(5:1) ratio of the quantity of the circulated amine product to the quantity of the supplied amine, to obtain the objective isocyanate. Further, e.g. in an additional catalysis process by performing the reaction in a loop reactor and installing the bubbling column at the inside or the outside of the reactor, at a temperature of completely decomposing carbamic acid chloride, it is preferable to react the amine hydrochloride contained in the reaction mixture with phosgene and to contain the primary amine as a 10-50 wt.% organic solvent solution.

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Inventors:

ROBERUTO BANKUBUITSUTSU
HERUBERUTO GEBAUAA
KURISUCHIYAN KEENITSUHI
ETSUKARUTO BUARUDAU

Application Number:

JP34432195A

Publication Date:

September 03, 1996

Filing Date:

December 06, 1995

Export Citation:

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Assignee:

BAYER AG

International Classes:

C07C263/10; C07C265/14; (IPC1-7): C07C265/14; C07C263/10

Domestic Patent References:

JPS5748954A	1982-03-20
JPS451447B1	1970-01-19
JPS3510774B1	1960-08-08
JPS5538337B1	1980-10-03

Other References:

工業反応装置-選定・設計・実例-, JPN4006019222, 1984, pages 262 - 267, ISSN: 0000785155
工業反応装置-選定・設計・実例-, JPNX007041249, 1984, pages 262 - 267, ISSN: 0000879656

Attorney, Agent or Firm:

Kazuho Kawarada (1 person outside)

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