PROCESS FOR PRODUCING DIFLUOROMETHANE

Title:

PROCESS FOR PRODUCING DIFLUOROMETHANE

Document Type and Number:

WIPO Patent Application WO/1995/035271

Kind Code:

A1

Abstract:

A process for producing difluoromethane by fluorinating dichloromethane with hydrogen fluoride in a liquid phase in the presence of a fluorination catalyst under such conditions that the reaction is conducted under an absolute pressure of 1 - 10 kg/cm2 at a temperature in the range of 50 to 150 °C and the selected reaction temperature is a temperature at which hydrogen fluoride is not liquefied under the above-specified pressure. The above conditions serve to attain an extremely high conversion of dichloromethane and hydrogen fluoride and to minimize the amounts of by-products other than R30 by recycling unreacted starting materials, typically at most 0.1 % based on difluoromethane. Furthermore, the corrosion of the reactor scarcely occurs in the reaction of a highly corrosive antimony chloride fluoride with hydrogen fluoride, as long as the above conditions are kept.

Inventors:

TSUDA TAKEHIDE (JP)
YAMADA YASUFU (JP)
SHIBANUMA TAKASHI (JP)

Application Number:

PCT/JP1995/001122

Publication Date:

December 28, 1995

Filing Date:

June 07, 1995

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
TSUDA TAKEHIDE (JP)
YAMADA YASUFU (JP)
SHIBANUMA TAKASHI (JP)

International Classes:

C07B61/00; C07C17/20; B01J23/26; C07C17/21; C07C17/383; C07C19/08; (IPC1-7): C07C19/08; C07C17/20

Foreign References:

JPS52103392A	1977-08-30
JPH0717882A	1995-01-20

Other References: