Title:
PROCESS FOR PRODUCING DIFLUOROMETHANE
Document Type and Number:
WIPO Patent Application WO/1998/008789
Kind Code:
A1
Abstract:
A process for refining difluoromethane by removing hydrogen fluoride which is contained in difluoromethane and has been believed to be difficult to remove, which process comprises distilling a mixture of difluoromethane with hydrogen fluoride and bringing an azeotropic mixture of both compounds as a distillate into contact with sulfuric acid, whereby hydrogen fluoride contained in difluoromethane is absorbed by sulfuric acid.
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JPS58217402 | MANUFACTURE OF HYDROGEN FLUORIDE |
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Inventors:
TSUDA TAKEHIDE (JP)
SHIBANUMA TAKASHI (JP)
YAMADA YASUFU (JP)
SHIBANUMA TAKASHI (JP)
YAMADA YASUFU (JP)
Application Number:
PCT/JP1997/002961
Publication Date:
March 05, 1998
Filing Date:
August 26, 1997
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
TSUDA TAKEHIDE (JP)
SHIBANUMA TAKASHI (JP)
YAMADA YASUFU (JP)
TSUDA TAKEHIDE (JP)
SHIBANUMA TAKASHI (JP)
YAMADA YASUFU (JP)
International Classes:
C01B7/19; C07C17/38; C07C19/08; (IPC1-7): C07C19/08; C07C17/20; C07C17/38
Domestic Patent References:
WO1993021140A1 | 1993-10-28 |
Foreign References:
US3873629A | 1975-03-25 | |||
JPH06172228A | 1994-06-21 | |||
JPH07258125A | 1995-10-09 |
Other References:
See also references of EP 0924178A4
Attorney, Agent or Firm:
Aoyama, Tamotsu (IMP Building 3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka 540, JP)
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