METHOD AND DEVICE FOR PURIFYING 2,3,3,3-TETRAFLUOROPROPENE AND PROCESS FOR PRODUCING SAME

Title:

METHOD AND DEVICE FOR PURIFYING 2,3,3,3-TETRAFLUOROPROPENE AND PROCESS FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2013/099856

Kind Code:

A1

Abstract:

Provided are a method and a device for efficiently obtaining 2,3,3,3-tetrafluorpropene reduced in both organic-impurity content and water content. The method for purifying 2,3,3,3-tetrafluoropropene is a method for continuously purifying crude 2,3,3,3-tetrafluoropropene which contains water and organic impurities, the method comprising: using a device equipped with a distillation column having X stages (3≤X. The nearest stage from the column top is referred to as first stage.) and with a means for taking a distillate out of the top of the distillation column and for cooling and condensing the distillate; feeding the crude 2,3,3,3-tetrafluoropropene to the m-th stage of the distillation column (m is n+1≤m≤X, where n is 2≤n≤X-1.); returning at least some of the distillate cooled and condensed in the cooling/condensation means to the h-th stage of the distillation column (h is 1≤h≤n-1.); and withdrawing a liquid phase part present in the n-th stage of the distillation column to thereby obtain purified 2,3,3,3-tetrafluoropropene.

Inventors:

KAWAGUCHI SATOSHI (JP)
TAKAGI HIROKAZU (JP)
TSUZAKI MASAAKI (JP)
FUKUSHIMA MASATO (JP)
OKAMOTO HIDEKAZU (JP)

Application Number:

PCT/JP2012/083449

Publication Date:

July 04, 2013

Filing Date:

December 25, 2012

Export Citation:

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Assignee:

ASAHI GLASS CO LTD (JP)

International Classes:

C07C17/383; C07C21/18

Domestic Patent References:

WO2010024366A2	2010-03-04
WO2010024366A2	2010-03-04

Foreign References:

JP2009513719A

2009-04-02

Other References: