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A kind of preparation method of 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and trifluoropropene, which is applied in the direction of dehydrohalogenation preparation, organic chemistry, etc., can solve the problems of unsuitable preparation of target products and low conversion rate, and achieve easy industrial application, high conversion rate and low risk Effect

Active Publication Date: 2018-12-28
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it turns out that when X is a fluorine atom, that is, R f When it is a perfluoroalkyl group, its conversion rate is very low, only about 20%, so it is not suitable for the preparation of the target product HFO-1234yf
[0004] There are relatively few domestic researches on HFO-1234yf, mainly including Changshu Sanaifu Zhonghao Chemical New Material Co., Ltd., Xi'an Modern Chemical Research Institute and Sinochem Group. The main work done is only some overviews of foreign existing technologies. However, no practical research and exploration has been done on the development of low-cost, low potential risk, high reaction yield and easy realization of industrialized process routes.

Method used

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Embodiment 1

[0033] A kind of preparation method of 2,3,3,3-tetrafluoropropene, comprises steps as follows:

[0034] In the 500ml SUS316 reactor that is used as the first reactor, load 1.85g catalyst I (SbCl 5 , CrCl 3 and ZnCl 2 Mixed according to the mass ratio of 1:2:1) and 388.5g of the reaction substrate 2-chloro-3,3,3-trifluoropropene, wherein the reactor used as the first reactor is a jacketed device, and the heating method is a resistance wire Heating, the thermocouple measures the temperature of the reaction mixture, inserts the thermocouple into the reaction mixture, and controls the temperature of the reaction through a temperature controller, so that the temperature in the first reactor is controlled at 40°C; HF gas is blown into the first reactor , its flow rate is controlled by a ball valve and a mass flow meter, so that the feed amount is 120g, and the mechanical stirring is started while HF is blown in. The product mixed flow from the first reactor is condensed at 20°C by...

Embodiment 2

[0036] As described in Example 1, the difference is that the reaction temperature in the first reactor is changed to 50° C., and others are the same as in Example 1. The product component analysis from the first reactor and the second reactor are all passed through gas chromatography. , and the obtained analysis results are listed in Table 1.

Embodiment 3

[0038] As described in Example 1, the difference is that the reaction temperature in the first reactor is changed to 60°C, and others are the same as in Example 1, and the product component analysis from the first reactor and the second reactor are all passed through gas chromatography , and the obtained analysis results are listed in Table 1.

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Abstract

The invention relates to a preparation method of 2, 3, 3, 3-tetrafluoropropene. The preparation method comprises the following steps: (1) mixing 2-chloro-3, 3, 3-trifluoropropene and a catalyst I to obtain a mixed material, introducing HF into the mixed material under the condition of stirring, carrying out reaction for 0.5-1 minute at the temperature of 0-100 DEG C, removing HF, and drying to obtain an intermediate product; and (2) mixing the intermediate product obtained in the first step and a catalyst II, carrying out reaction for 1.5-2 minutes at the temperature of 300-500 DEG C under the condition of stirring, removing HF and HCI, and drying to obtain 2, 3, 3, 3-tetrafluoropropene. The preparation method is simple in process, small in dangerousness, high in selectivity reaching up to above 85 percent, high in conversion rate reaching up to above 93 percent, low in cost, low in energy consumption, low in requirements for equipment with the reaction temperature to be only 300-500 DEG C and easy in industrial application.

Description

technical field [0001] The invention relates to a method for synthesizing hydrofluoroolefins, specifically a C 3 A method for preparing hydrofluoroolefins, more specifically a method for preparing 2,3,3,3-tetrafluoropropene (HFO-1234yf), belongs to the technical field of organic chemicals. technical background [0002] Hydrofluoroolefin 2,3,3,3‐tetrafluoropropene (referred to as HFO-1234yf) has zero ozone depletion potential (ODP = 0), low greenhouse effect potential (GWP = 4), and is used as an alternative to many refrigerants. Among the products, 2,3,3,3‐tetrafluoropropene stands out. DuPont's Marquis david M published Preparation of 2,3,3,3-tetrafluoropropene[p]CA690037.1964-07-07 in 1964, and the US patent document US2931840A introduced 2,3,3,3-tetrafluoropropene The preparation method, all adopts monochloromethane and tetrafluoroethylene (volume ratio is 1:1) or monochloromethane and difluorochloromethane (volume ratio is 1:2) as raw materials, 700-900 ℃ in the specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/18C07C17/25
Inventor 韩春华徐强任国亮都荣礼王鑫
Owner SHANDONG DONGYUE CHEM