Method for preparing 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and tetrachloropropene, applied in 2 fields, can solve problems such as many reaction steps

Active Publication Date: 2011-04-06
山东华安近代环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method reaction step is more, has three-step reaction in all, and the second step reaction is a liquid phase reaction, needs to separate the intermediate product HCFC-244bb, as the raw material of the third step reaction

Method used

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  • Method for preparing 2,3,3,3-tetrafluoropropene
  • Method for preparing 2,3,3,3-tetrafluoropropene
  • Method for preparing 2,3,3,3-tetrafluoropropene

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 60 milliliters of chromium-based fluorination catalyst containing Al, Zn, Mg and Ni into a carbon steel pipe with an inner diameter of 38 mm. The preparation method of the catalyst is shown in Chinese patent CN1651137A. The temperature of the first reactor was raised to 260°C, and HF and 1,1,1,2,2-pentachloropropane (HCC-240ab) were introduced to react, the molar ratio of HF to HCC-240ab was controlled to be 10, and the contact time was 6 seconds, the reaction pressure is 0.1MPa, and after 20 hours of reaction, the reaction product is washed with water, washed with alkali, and dried with alkali to remove HCl and HF. The composition of the organic matter in the reaction product is analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 2

[0037] The operation was basically the same as in Example 1, except that the reaction temperature of the first reactor was changed to 220° C., the results are shown in Table 1.

Embodiment 3

[0039] The operation was basically the same as in Example 1, except that the reaction temperature of the first reactor was changed to 300° C., the results are shown in Table 1.

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Abstract

The invention discloses a method for preparing 2,3,3,3-tetrafluoropropene, comprising the following steps: a. in the presence of a fluorinated catalyst, hydrogen fluoride and 1,1,2,3-tetrafluoropropene enter into a first reactor to react; b. in the presence of the fluorinated catalyst, 2-chloro-3,3,3 trifluoropropene, 2-chloro-1,1,1,2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and hydrogen fluoride enter into a second reactor to react; c. the product flows obtained in the steps a and b enter into a first distillation tower to be separated; the tower top components are hydrogen chloride and 2,3,3,3-tetrafluoropropene which break away from the system and others are column reactor components; and d. the column reactor components in the step c enter into a second distillation tower to be separated; the column reactor components include 2-chloro-3,3,3 trifluoropropene and 2-chloro-1,1,1,2-tetrafluoropropane which are recycled to the second reactor; and the tower top components, including hydrogen fluoride and 1,1,1,2,2-pentafluoropropane, are recycled to the first reactor or/and the second reactor to be used.

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 preparation method of 1,1,1,2,2-pentachloropropene in the presence of fluorination catalyst Propane (HCC-240ab) or 2,3,3,3-tetrafluoropropene is used as raw material, and the preparation method of 2,3,3,3-tetrafluoropropene is obtained through two-step gas phase fluorination reaction. Background technique [0002] At present, 1,1,1,2-tetrafluoroethane (HFC-134a) is widely used in mobile air-conditioning refrigeration systems, because its greenhouse effect potential (GWP) is 1430, it will cause global warming, and it is necessary to develop new Substitutes to suit the needs of the environment. [0003] 2,3,3,3-Tetrafluoropropene, Ozone Depletion Potential (ODP) is zero, GWP is 4, atmospheric life is only 11 days, has excellent physical and chemical properties, and is considered to be an economical direct replacement for HFC-134...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/25
Inventor 王博吕剑张伟曾纪珺马洋博杜咏梅袁俊徐强封利民
Owner 山东华安近代环保科技有限公司
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