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HFC-245fa refining method

A technology of hfc-245fa and refining method, which is applied in the field of removing unsaturated impurities in crude HFC-245fa, which can solve the problems that cannot be removed efficiently and conveniently, and achieve the effects of low cost, simple processing method and easy-to-obtain raw materials

Active Publication Date: 2013-01-23
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantage that the existing technology cannot efficiently and conveniently remove the unsaturated halogenated hydrocarbon impurities contained in HFC-245fa, the present invention provides a refining method for HFC-245fa, which effectively removes the impurities contained in the crude HFC-245fa by using an activated carbon adsorbent. 1-chloro-3,3,3-trifluoropropene (R1233zd), 1-chloro-1,3,3,3-tetrafluoropropene (R1224zd), 2-chloro-1,3,3,3-tetrafluoropropene Unsaturated impurities consisting of propylene (R1224xe) and other halogenated hydrocarbons containing unsaturated bonds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0040] Respectively untreated, 3mol / L nitric acid treatment and 3mol / L sodium hydroxide solution treated activated carbon as adsorbent, denoted as embodiment 1, 2, 3, filled with adsorbent internal diameter 20mm, long 40mm stainless steel tube In the process, the total weight is 50g and contains 720ppm R1233zd, 100ppm R1224zb, 105ppm R1224xe, and HFC-245fa crude product with a purity of 99.83%. -1 The space velocity enters the adsorption fixed bed from the top of the adsorbent. After the adsorbed gas was collected by condensation, the content of each component was analyzed by gas chromatography. The results are shown in Table 1.

[0041] Table 1

[0042] Example

Embodiment 4-7

[0044] Respectively with 1mol / L, 3mol / L, 6mol / L and the activated carbon that the hydrochloric acid of 8mol / L is processed is adsorbent, be recorded as embodiment 4,5,6,7, other conditions are identical with embodiment 1-3, result as table 2.

[0045] Table 2

[0046] Example

Embodiment 8-11

[0048] The active carbon that the potassium hydroxide solution of 1mol / L, 3mol / L, 6mol / L and 8mol / L is processed respectively is adsorbent, is recorded as embodiment 8, 9, 11, 11, and other condition embodiment 1-3 is identical , the results are shown in Table 3.

[0049] table 3

[0050] Example

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Abstract

The invention relates to a 1,1,1,3,3-pentafluoropropane (HFC-234fa) refining method. In the method, treatment by activated carbon adsorbent treated by an acid and / alkali is performed to effectively remove unsaturated impurities such as 1-chloro-3,3,3-trifluoropropene (R1233zd), 1-chloro-3,3,3-tetrafluoropropene (R1224zd) and 2-chloro-3,3,3-tetrafluoropropene (R1224xe) in the crude product of HFC-245 fa. The HFC-245fa refining method has the advantages of readily available raw materials, low cost, non-toxicity, environmental friendliness, simple treatment method and the like. The product HFC-245 fa is mainly used to replace HCFC-141b in polyurethane foaming.

Description

technical field [0001] The invention relates to a method for refining 1,1,1,3,3-pentafluoropropane (HFC-245fa), in particular to a method for removing unsaturated impurities in crude HFC-245fa. Background technique [0002] As a third-generation ODS substitute, HFC-245fa can not only be used as a blowing agent to replace 1,1-dichloro-1-fluoroethane (HCFC-141b), but also can be used as a refrigerant, cleaning agent, etc. widely. [0003] There are several synthetic methods of HFC-245fa, such as the international patent application WO96 / 01797, which discloses the preparation of hydrogen fluoride and 1,1,1,3,3-pentachloropropane (R240fa) liquid phase fluorination reaction in the presence of an antimony catalyst. Obtain HFC-245fa; US Patent No. 2,942,036 discloses a preparation method of HFC-245fa by hydrogenating 1,2,2-tri-chloropropane to obtain HFC-245fa. In the known preparation method of HFC-245fa, various unsaturated halogenated hydrocarbon impurities will be generated i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/08C07C17/38C07C17/389
Inventor 张波张建君葛忠华方小青
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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