Title:
METHODS FOR SEPARATION OF 1,3,3,3-TETRAFLUOROPROPENE FROM HYDROGEN FLUORIDE BY AZEOTROPIC DISTILLATION
Document Type and Number:
Japanese Patent JP2014193931
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide methods for the separation of E-HFC-1234ze and HF by azeotropic distillation.SOLUTION: A method for separating a mixture comprising HF and E-HFC-1234ze comprises: a step a. of feeding the mixture comprising HF and E-HFC-1234ze to a first distillation column; a step b. of removing an azeotrope composition comprising HF and E-HFC-1234ze as a first distillate and either i) HF or ii) E-HFC-1234ze as a first column bottoms composition; a step c. of decanting the first distillate to form 2 liquid phases, being i) an HF-rich phase and ii) an E-HFC-1234ze-rich phase; and a step d. of recycling a first liquid phase enriched in the same compound that is removed as the first column bottoms, back to the first distillation column, the first liquid phase being either i) the HF-rich phase or ii) the E-HFC-1234ze-rich phase.
Inventors:
JEFFREY P KNAPP
Application Number:
JP2014138832A
Publication Date:
October 09, 2014
Filing Date:
July 04, 2014
Export Citation:
Assignee:
DU PONT
International Classes:
C07C17/386; C07C21/18
Domestic Patent References:
| JP2010501579A | 2010-01-21 | |||
| JP2009513715A | 2009-04-02 | |||
| JPH02295938A | 1990-12-06 |
Foreign References:
| US20080051612A1 | 2008-02-28 |
Attorney, Agent or Firm:
Patent business corporation A valley and Abe patent firm
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