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Preparation method of 2, 3, 3, 3-tetrafluoropropene

A technology of tetrafluoropropylene and tetrafluoroethylene, applied in the chemical field, can solve the problems of only 13%, not suitable for industrialization, and less HFO-1234yf

Active Publication Date: 2012-05-09
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DuPont's Marquis david M published Preparation of 2,3,3,3-tetrafluoropropene[p]CA690037.1964-07-07 in 1964, the method is mainly to prepare 2 by monochloromethane and tetrafluoroethylene as raw materials, 3,3,3-Tetrafluoropropene, this process produces 2,3,3,3-tetrafluoropropene without using a catalyst and at a temperature as high as 950°C. The result shows that the conversion rate is only 13%, so it is not suitable Realize industrialization
In the 1980s, Daikin Corporation also began to study the preparation of HFO-1234yf. At that time, HFO-1234yf was mainly used as a polymerized monomer and comonomer. The Daikin publication number was US73038947, and the basic method introduced was to use fluoroethanol as a raw material (general formula is R f CF 2 CH 2 OH) and thionyl chloride are reacted in N,N-dimethylformamide solution under the action of amino compound as catalyst to obtain R f CF 2 CH 2 Cl, then the resulting product R f CF 2 CH 2 Cl reacts with metal zinc to obtain the target product. Since the toxic organic solvent thionyl chloride is used in the reaction process, it is difficult to handle the organic solvent used after the reaction. In addition, the second step reaction yield in this patent is very low. Comprehensive consideration of this method is difficult to achieve industrialization
[0004] Domestic research on the preparation of HFO-1234yf is less, and there are almost no reports on the industrialization technology of HFO-1234yf

Method used

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Embodiment 1

[0029] A preparation method of 2,3,3,3-tetrafluoropropene, which uses tetrafluoropropene and a compound of the general formula CHXYZ as raw materials, and reacts in the presence of a catalyst to prepare 2,3,3,3-tetrafluoropropene. The compound of general formula CHXYZ is CH 3 Cl, the synthetic route is as follows:

[0030] CF 2 = CF 2 +CH 3 Cl→CF 3 CF=CH 2 +HCl

[0031] 20g of ZnF is filled in a SUS316 stainless steel tubular reactor device with an inner diameter of 2cm and a length of 40cm 2 / C catalyst, first feed nitrogen for replacement, then heat the device with steam to 450°C, continue nitrogen replacement for a period of time, stop nitrogen, start feeding monochloromethane and tetrafluoroethylene gas, and keep the internal pressure of the device at 0.3Mpa , wherein the flow rate of monochloromethane is 50ml / min, the flow rate of tetrafluoroethylene gas is 25ml / min, the temperature of the reaction tube is maintained at 450°C, the mixed gas after the reaction is co...

Embodiment 2

[0033] The reactor used in Example 1 is adopted, and the raw materials and operation steps are the same as those in Example 1. The reaction device is heated to 500°C by steam, and the constant temperature condition is maintained. The mixed gas after the reaction is collected at the outlet of the reaction device, and its components are analyzed by gas chromatography. , and the results are listed in Table 1.

Embodiment 3-5

[0035] Using the reactor used in Example 1, the raw materials, catalysts, and operating steps are the same as in Example 1, except that the steam heating reaction device is respectively heated to 550°C, 600°C, and 650°C, and the corresponding temperature is kept at a constant temperature. The reacted mixed gas was collected at the outlet of the device, and its components were analyzed by gas chromatography, and the results are listed in Table 1.

[0036] Table 1: Its component of embodiment 3-5 gas chromatography analysis

[0037]

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Abstract

The invention provides a preparation method of 2, 3, 3, 3-tetrafluoropropene. With a compound having a general formula of CHXYZ and tetrafluoroethylene as reaction raw materials, 2, 3, 3, 3-tetrafluoropropene is prepared through reaction under the action of a catalyst. The method of the invention adopts common substances as the reaction raw materials, overcomes the defect of uneasily available raw materials, and has the advantages of easy reaction operation, high yield, and high product purity. The prepared 2, 3, 3, 3-tetrafluoropropene has the advantages of zero ODP (ozone depression potential) and low GWP (global warming potential), and can be used as an ideal substitute of new generation automobile air-conditioner refrigerants.

Description

technical field [0001] The invention relates to a preparation method of HFO-1234yf refrigerant with excellent performance, more specifically a preparation method of 2,3,3,3-tetrafluoropropene (HFO-1234yf), which belongs to the field of chemical technology. Background technique [0002] In recent years, the problem of global warming has become increasingly serious, and reducing greenhouse gas emissions has become one of the focuses of global environmental protection. The "Montreal Protocol" has determined the phase-out schedule of HCFCs. At present, the substitutes of HCFCs are mainly HFCs and their mixtures, including R-32, R-134a, R-152a and so on. Although the ozone depletion potential (ODP) of HFCs is 0, it has a high greenhouse effect potential (GWP), and has been included in the annex of greenhouse gases by the "Kyoto Protocol". As the greenhouse effect becomes more and more serious, people pay more attention to environmental issues. From the perspective of environment...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/269
Inventor 韩春华张永明张恒陈越
Owner SHANDONG DONGYUE POLYMER MATERIAL
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