METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132)

Title:

METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132)

Document Type and Number:

WIPO Patent Application WO/2020/213474

Kind Code:

A1

Abstract:

The present invention provides a method for purifying HFO-1132 with high purity, by suppressing isomerization and loss of HFO-1132.　Specifically, the present invention provides a method for purifying 1,2-difluoroethylene (HFO-1132), the method including, in the following order: step 1 for reducing the amount of water from a composition containing trans-1,2-difluoroethylene (HFO-1132(e)) and water, by bringing the composition into contact with a zeolite having an average pore diameter of 2-4 Å; and step 2 for recovering a purified product in which HFO-1132(E) and HFO-1132(Z) containing a reduced amount water are included in an amount of less than 0.1% by volume.

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Inventors:

USUI TAKASHI (JP)
TAKAHASHI KAZUHIRO (JP)
IWAMOTO TOMOYUKI (JP)

Application Number:

PCT/JP2020/015656

Publication Date:

October 22, 2020

Filing Date:

April 07, 2020

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)

International Classes:

C07C21/18; C07C17/389

Domestic Patent References:

WO2015125877A1

2015-08-27

Foreign References:

JP2013241348A	2013-12-05
RU2078070C1	1997-04-27

Other References:

CRAIG, NORMAN C.: "Thermodynamics of cis-trans Isomerizations. The 1,2-Difluoroethylenes", J. AM. CHEM. SOC., vol. 83, 1961, pages 3047 - 3050, XP055663370
See also references of EP 3957622A4

Attorney, Agent or Firm:

SAEGUSA & PARTNERS (JP)

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