AZEOTROPIC MIXTURE COMPOSED OF 1,1-DIFLUOROETHANE AND HYDROGEN FLUORIDE AND PROCESS FOR PRODUCING 1,1-DIFLUOROETHANE

Title:

AZEOTROPIC MIXTURE COMPOSED OF 1,1-DIFLUOROETHANE AND HYDROGEN FLUORIDE AND PROCESS FOR PRODUCING 1,1-DIFLUOROETHANE

Document Type and Number:

WIPO Patent Application WO/1994/022796

Kind Code:

A1

Abstract:

The invention provides a minimum-boiling-point azeotropic binary mixture substantially composed of hydrogen fluoride (HF) and 1,1-difluoroethane (HFC-152a). Also provided is a process for producing HFC-152a comprising the steps of distilling a mixture containing HFC-152a and HF, drawing an azeotropic mixture out of the column top, and recovering either HFC-152a-free HF or HF-free HFC-152a from the column bottom, thereby recovering more effectively either HFC-152a-free HF or HF-free HFC-152a.

Inventors:

TSUDA TAKEHIDE (JP)
KOMATSU SATOSHI (JP)

Application Number:

PCT/JP1994/000558

Publication Date:

October 13, 1994

Filing Date:

April 05, 1994

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
TSUDA TAKEHIDE (JP)
KOMATSU SATOSHI (JP)

International Classes:

C01B7/19; C07C17/38; C07C17/383; C07C17/386; C07C19/08; (IPC1-7): C07C19/08; C07C17/38

Foreign References:

DE2310749A1	1974-09-12
JPH02196734A	1990-08-03

Other References: