Method for Purifying Trans-1,3,3,3-Tetrafluoropropene

• US 20140051896A1
• Filed: 06/27/2013
• Published: 02/20/2014
• Est. Priority Date: 06/28/2012
• Status: Active Grant

• Current Assignee: Central Glass Company Limited
• Original Assignee: Central Glass Company Limited
• Inventors: IMURA, Hideaki, TAKADA, Naoto, OKAMOTO, Masamune
• Granted Patent: US 9,174,897 B2
• Time in Patent Office: Days
• US Class Current: 570/179
• CPC Class Codes: C07B 2200/09 Geometrical isomers
• CPC Class Codes: C07C 17/38 Separation; Purification; Stabilisation; Use of additives
• CPC Class Codes: C07C 17/389 by adsorption on solids
• CPC Class Codes: C07C 19/08 containing fluorine
• CPC Class Codes: C07C 19/10 and chlorine
• CPC Class Codes: C07C 21/18 containing fluorine
• CPC Class Codes: C07C 21/22 containing carbon-to-carbon triple bonds

Abstract

Disclosed is a method for purifying a trans-1,3,3,3-tetrafluoropropene, in which a composition containing trans-1,3,3,3-tetrafluoropropene and at least one impurity selected from the group consisting of C₂H₃ClF₂, CF₃CH₂CHClF, CF₃CH₂CHF₂, CHF₂CH═CF₂, CF₃CH═CHCl, CF₃CH═CH₂, CF₃C≡CH, and cis-1,3,3,3-tetrafluoropropene is brought into contact with a solid adsorbent to reduce an impurity content thereof. By this method, it is possible to remove the impurity in trans-1,3,3,3-tetrafluoropropene by a simple operation.

Claims

1. A method for purifying a trans-1,3,3,3-tetrafluoropropene, comprising the step of bringing a composition containing trans-1,3,3,3-tetrafluoropropene and at least one impurity selected from the group consisting of C₂H₃ClF₂, CF₃CH₂CHClF, CF₃CH₂CHF₂, CHF₂CH═

CF₂, CF₃CH═

CHCl, CF₃CH═

CH₂, CF₃C≡

CH, and cis-1,3,3,3-tetrafluoropropene into contact with a solid adsorbent to reduce an impurity content thereof.

2. The purification method according to claim 1, wherein one of the impurities is cis-1,3,3,3-tetrafluoropropene or CF₃CH₂CHF₂.

3. The purification method according to claim 1, wherein the solid adsorbent is zeolite A or zeolite X.

4. A method for producing trans-1,3,3,3-tetrafluoropropene, comprising the step of purifying a trans-1,3,3,3-tetrafluoropropene by bringing a composition containing trans-1,3,3,3-tetrafluoropropene and at least one impurity selected from the group consisting of C₂H₃ClF₂, CF₃CH₂CHClF, CF₃CH₂CHF₂, CHF₂CH═

CF₂, CF₃CH═

CHCl, CF₃CH═

CH₂, CF₃C≡

CH, and cis-1,3,3,3-tetrafluoropropene into contact with a solid adsorbent to reduce an impurity content thereof.

5. A solid-liquid, heterogeneous mixture, comprising:

a composition containing trans-1,3,3,3-tetrafluoropropene and at least one organic matter selected from the group consisting of C₂H₃ClF₂, CF₃CH₂CHClF, CF₃CH₂CHF₂, CHF₂CH═

CF₂, CF₃CH═

CHCl, CF₃CH═

CH₂, CF₃C≡

CH, and cis-1,3,3,3-tetrafluoropropene, and

a solid adsorbent.