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Preparation method of 2,3,3,3-tetrapion propylene

A technology of tetrafluoropropene and tetrafluoropropane, which is applied in the preparation of dehydrohalogenation, organic chemistry, etc., can solve the problems of easy coking and deactivation of catalysts, frequent regeneration of catalysts, short continuous production cycle, etc. The effect of continuous production cycles

Active Publication Date: 2013-09-25
山东华安近代环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst is a solid acid catalyst and the target product is olefin, the catalyst is easily coked and deactivated during the reaction, and its life is short. The catalyst needs to be regenerated frequently, resulting in a short continuous production cycle.

Method used

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  • Preparation method of 2,3,3,3-tetrapion propylene
  • Preparation method of 2,3,3,3-tetrapion propylene

Examples

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Effect test

Embodiment 1

[0019] HCFC-244bb is thermally cracked under the conditions of normal pressure, reaction temperature 450°C, and residence time 60 seconds. The conversion rate of HCFC-244bb is 90.3%, the selectivity of HFO-1234yf is 32.2%, and the selectivity of HFO-1233xf is 57.7% %.

Embodiment 2

[0021] The same operation as in Example 1, except that the reaction temperature is 900° C., the residence time is 0.01 second, the conversion rate of HCFC-244bb is 99.5%, the selectivity of HFO-1234yf is 63.4%, and the selectivity of HFO-1233xf is 15.7%.

Embodiment 3

[0023] The same operation as in Example 1, except that the reaction temperature is 750° C., the residence time is 0.1 second, the conversion rate of HCFC-244bb is 97.8%, the selectivity of HFO-1234yf is 58.5%, and the selectivity of HFO-1233xf is 28.2%.

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Abstract

The invention provides a preparation method of 2,3,3,3-tetrapion propylene. The 2,3,3,3-tetrapion propylene is prepared through thermal cracking in the presence of dissolved gases by using 2-chlorine-2,3,3,3-tetrafluoro propane as a raw material, wherein the dissolved gases are nitrogen, water vapor or HF; the molar rate of the dissolved gases to the 2-chlorine-2,3,3,3-tetrafluoro propane is 0 to 20:1, the reaction temperature is from 450 to 900 DEG C, and the contact time is from 0.01 to 60 seconds. The preparation method provided by the invention does not need catalysts in the reaction process, and overcomes the defects of easy coking and inactivation, and short continuous production period of the catalysts of the prior art.

Description

technical field [0001] The present invention relates to a kind of preparation method of 2,3,3,3-tetrafluoropropene (HFO-1234yf), especially a kind of 2-chloro-2,3,3,3-tetrafluoropropane (HCFC-244bb) thermal Cracking to obtain 2,3,3,3-tetrafluoropropene preparation method. Background technique [0002] 2,3,3,3-Tetrafluoropropene has zero ozone depletion potential and low greenhouse effect gas, so it is considered as an ideal substitute for HFC-134a. US Patent US20090043136 discloses a preparation method of HFO-1234yf, which uses HCFC-244bb as a raw material, and synthesizes HFO-1234yf by removing HCl at 200°C-600°C under the action of a catalyst. Since the catalyst is a solid acid catalyst and the target product is olefin, the catalyst is easily coked and deactivated during the reaction process, and its lifespan is short. The catalyst needs to be regenerated frequently, resulting in a short continuous production cycle. Contents of the invention [0003] The purpose of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/18C07C17/25
Inventor 张伟吕剑曾纪珺王博郝志军封利民袁俊石磊
Owner 山东华安近代环保科技有限公司
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