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Preparation method of 2,3,3,3-tetrafluoropropylene

A technology of tetrafluoropropene and trifluoropropene, which is applied in the field of chemical synthesis, can solve the problems of low production of tetrafluoropropene and difficulty in catalyst preparation, and achieve the effects of good conversion rate, wide industrial application prospect and high yield

Active Publication Date: 2019-03-08
ZHEJIANG SANMEI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this preparation method is that it consumes the toxic substance CF 3 CF 2 CH 3 , the disadvantage is the low yield of 2,3,3,3-tetrafluoropropene
The preparation method has a high conversion rate, but the catalyst CrO x f y more difficult to prepare

Method used

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  • Preparation method of 2,3,3,3-tetrafluoropropylene
  • Preparation method of 2,3,3,3-tetrafluoropropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] To the Monel tube reactor Ⅰ with a length of 1.5m and an inner diameter of 100mm, the catalyst SbF 3 -SbF 5 -AlCl 3 / C, the temperature of reactor I is set to 220°C, and the pressure is set to 4bar; the CH 2 ClF and CF 2 = CHCl is mixed at a molar ratio of 10:1 and passed into the reactor Ⅰ, and the residence time is controlled to be 10s. The reaction product is cooled by circulating water at 20°C to recover the liquid product, and the gas product is recycled to the reactor Ⅰ.

[0029] The HCFC-243db is sent to the preheater through the metering pump, then enters the vaporization mixer, and then enters the CrF 3 The catalyst is placed in the Reactor II of a Hastelloy corrosion-resistant nickel-based alloy tube with a length of 1 m and an inner diameter of 60 mm. Control the reaction temperature to 320° C., the reaction pressure to 5 bar, and the residence time to 60 s. The reaction product is washed with alkali and water at 40°C, and after drying, the gas product H...

Embodiment 1-5

[0032] Add the catalyst SbF 3 -SbF 5 -AlCl 3 / C, where Sb 3+ , Sb 5+ 、Al 3+ The molar ratio is 1:1:1, and 2-chloro-1,1-difluoroethylene (CF 2 =CHCl) and chlorofluoromethane (CH 2 ClF), the product should be made into HCFC-243db after alkali washing, water washing and rectification. The reaction conditions and reaction results are shown in Table 1.

[0033] Table 1: Preparation of HCFC-243db.

[0034]

[0035]

Embodiment 6-10

[0037] After the HCFC-243db made in Examples 1-5 is transported to the preheater by a metering pump, it is passed into the monel tube reactor II with a length of 1.5m and an inner diameter of 100mm, and the reactor II is filled with catalyst Cr 2 o 3 - Ni / C, wherein the mass ratio of Cr to Ni is 2:1. Anhydrous HF gas was introduced into the reactor II, and the reaction product was washed with alkali, washed with water, and rectified to obtain HFO-1234yf. The reaction conditions and results are shown in Table 2.

[0038] Table 2: Preparation of HFO-1234yf by Step 2(a).

[0039]

[0040] The reaction total conversion rate in conjunction with embodiment 1 and embodiment 6 is 32.7%, the reaction total conversion rate in conjunction with embodiment 2 and embodiment 7 is 41.2%, the reaction total conversion rate in conjunction with embodiment 3 and embodiment 8 is 49.5% , The total reaction conversion rate combined with Example 4 and Example 9 was 52.2%, and the total reaction ...

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Abstract

The invention discloses a preparation method of 2,3,3,3-tetrafluoropropylene. 1,1-difluoro-2-vinyl chloride and chlorofluoromethane are subjected to an addition reaction in presence of a catalyst to generate 1,1,1-trifluoro-2,3-dichloropropane, and 2,3,3,3-tetrafluoropropylene is prepared under catalysis of 1,1,1-trifluoro-2,3-dichloropropane through three routes. 1,1-difluoro-2-vinyl chloride which is harmful to human bodies and the environment is used as an initial material, and the environment is protected. A continuous tubular reactor is adopted for the reaction in the method, reaction conditions are easy to control, and equipment is simple to operate; conversion rate in each step of the preparation method is high, yield of the target product is higher, and the method has extensive industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of 2,3,3,3-tetrafluoropropene. Background technique [0002] As a new generation of refrigerant, 2,3,3,3-tetrafluoropropene has good cooling effect, small greenhouse effect, short atmospheric life, low flammability, and low toxicity. It can be widely used in refrigeration appliances such as automobiles, air conditioners, and refrigerators. It can also be used in fire extinguishing agent, foaming agent, foaming agent, grinding and polishing machine and other fields. However, compared with similar alternatives, the production cost of 2,3,3,3-tetrafluoropropene is high and the price is high. [0003] U.S. Patent US7560602B2 discloses the CF 3 CF 2 CF 2 CHCl 2 As a raw material, first hydrodechlorination to generate CF 3 CF 2 CH 3 , and then remove HF to obtain 2,3,3,3-tetrafluoropropene. The advantage of this preparation method is that it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C17/20C07C17/00C07C21/18
CPCC07C17/00C07C17/206C07C17/25C07C17/278C07C19/10C07C21/18
Inventor 徐庆瑞王晓东徐煜陈成凯吴陈兴吴业铧胡胜伟李飞占林喜
Owner ZHEJIANG SANMEI CHEM IND
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