Title:
METHOD FOR PURIFYING 2,3,3,3-TETRAFLUOROPROPENE
Document Type and Number:
WIPO Patent Application WO/2015/053339
Kind Code:
A1
Abstract:
Provided is a method for efficiently purifying 2,3,3,3-tetrafluoropropene (HFO-1234yf) from a mixture that includes HFO-1234yf and a fluorine compound, the boiling point of which is near that of HFO-1234yf. This method for purifying HFO-1234yf includes: (a) a step for preparing a distillation composition that contains a fluorine compound (excluding HFO-1234yf), the boiling point of which is between -14°C and -30°C inclusive, HFO-1234yf, and chloromethane; (b) a step for subjecting the distillation composition to a distillation in which an azeotropic composition of HFO-1234yf and chloromethane, and a fraction containing an azeotrope-like composition are formed; and (c) a step for obtaining, from said fraction, purified HFO-1234yf having a higher concentration of HFO-1234yf than said fraction.
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Inventors:
TAKEUCHI YU (JP)
OTSUKA TETSUO (JP)
FURUTA SHOJI (JP)
OTSUKA TETSUO (JP)
FURUTA SHOJI (JP)
Application Number:
PCT/JP2014/076995
Publication Date:
April 16, 2015
Filing Date:
October 08, 2014
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C07C17/386; C07C21/18
Domestic Patent References:
| WO2011030026A1 | 2011-03-17 | |||
| WO2013154059A1 | 2013-10-17 |
Foreign References:
| JP5149456B1 | 2013-02-20 | |||
| CN102442880A | 2012-05-09 | |||
| US2931840A | 1960-04-05 | |||
| JP2008506793A | 2008-03-06 |
Attorney, Agent or Firm:
SENMYO, Kenji et al. (JP)
Spring name Kenji (JP)
Spring name Kenji (JP)
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