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Production method for 2,3,3,3-tetra-fluoropropene

A technology of tetrafluoropropene and its manufacturing method, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as unrealistic, high VdF ratio, insufficient supply of raw material components, etc., and achieve great effect, cost reduction effect

Active Publication Date: 2014-11-26
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the method shown in Patent Document 2, with the increase of the residence time, there is a possibility that the formation of high boilers as byproducts and the carbonization of the raw material may cause clogging of the reactor. Special corrosion-resistant devices (platinum-covered reaction tubes, etc.) are required, which is completely unrealistic in consideration of industrial manufacturing
[0008] In the method described in Patent Document 1, the raw material components cannot be sufficiently supplied to the reaction, for example, the conversion rate of methyl chloride is 17%, and an efficient reaction cannot be realized.
In addition, the ratio of VdF in the obtained product is high, so it is difficult to say that HFO-1234yf can be efficiently produced

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0078] use figure 1 In the reaction apparatus shown, the raw material gas composed of R22 and R40 was as follows to obtain crude HFO-1234yf.

[0079] R40 was continuously introduced into the stainless steel tube preheater 2a in the electric furnace whose temperature in the furnace was set to 500°C, and R40 was heated to 500°C. In addition, R22 was continuously introduced into a preheater 3a made of stainless steel tubes in an electric furnace whose temperature in the furnace was set to 500°C, and R22 was heated to 500°C.

[0080] The heated steam (steam) was supplied at 0.04 MPa to the reactor 1 whose inner temperature was controlled at 850° C. by the heating steam generator 4 a which is an electric furnace whose inner temperature was set at 850° C. Further, the raw material gas components (R40 and R22) heated in advance and adjusted to the above-mentioned temperature are supplied to the reactor 1 under the following conditions; , and with respect to the total gas supply amo...

Embodiment 2～4

[0106] The reaction was carried out under the same conditions as in Example 1 except that the molar ratio (R40 / R22) of the supplied amount of R40 and the supplied amount of R22 was changed as shown in Table 1. Next, the gas of the reaction mixture taken out from the outlet of the reactor was treated in the same manner as in Example 1, and the obtained outlet gas was analyzed in the same manner as in Example 1. The results are shown in Table 1 together with the reaction conditions.

Embodiment 5

[0112] Same as Example 1, use figure 2 In the reaction apparatus shown, crude HFO-1234yf was obtained from the raw material gas composed of R22 and R40 as shown below.

[0113] R40 was continuously introduced into a stainless steel tube in an electric furnace whose temperature in the furnace was set to 600°C, and R40 was heated to 600°C. In addition, R22 was continuously introduced into a stainless steel tube in an electric furnace whose furnace temperature was set to 300°C, and R22 was heated to 300°C.

[0114] The raw material gas components (R40 and R22) heated in advance and adjusted to the above-mentioned temperature and steam (steam) heated by an electric furnace with the furnace temperature set at 750° C. were supplied to the reactor under the following conditions; The above conditions are: the molar ratio of the supply amount of the raw material components is set to R40 / R22=3, and the supply ratio of water vapor (water vapor / (R40+R22+water vapor) is expressed in volu...

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Abstract

Provided is an economic method for efficiently producing, in a sufficiently controlled state and in one reaction involving thermal decomposition, industrially useful HFO-1234yf, using readily procurable raw materials. Provided is a method for producing 2,3,3,3-tetra-fluoropropene from a raw material composition including chlorodifluoromethane and chloromethane, using a synthesizing reaction involving thermal decomposition, said method characterized by having: a step (a) in which chloromethane is premixed with chlorodifluoromethane at a ratio of 0.01-3.0 mols chloromethane to 1 mol of chlorodifluoromethane and supplied to a reaction vessel, or same are supplied separately thereto; a step (b) in which a heat medium is supplied to the reaction vessel; and a step in which the heat medium is brought in contact with the chlorodifluoromethane and the chloromethane inside the reaction vessel, and 2,3,3,3-tetra-fluoropropene is generated.

Description

technical field [0001] The present invention relates to a method for producing 2,3,3,3-tetrafluoropropene, especially the production of 2,3,3,3-tetrafluoropropene by a single reaction from chlorodifluoromethane and methyl chloride as raw materials Methods. Background technique [0002] As a new refrigerant to replace the greenhouse gas 1,1,1,2-tetrafluoroethane (HFC-134a), 2,3,3,3-tetrafluoropropene (HFO-1234yf) has received great expectations in recent years . In addition, in this specification, the compound abbreviation of a halogenated hydrocarbon is described in the parentheses after a compound name, However, In this specification, the abbreviation may be used instead of a compound name as needed. [0003] As a method for producing HFO-1234yf, it is known, for example, to desorb 1,1-dichloro-2,2,3,3,3-pentafluoropropane (HCFC-225ca) in an aqueous alkali solution in the presence of a phase transfer catalyst. A method in which 1,1-dichloro-2,3,3,3-tetrafluoropropene (CF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/269C07C21/18
CPCC07C17/269C07C21/18
Inventor 古田昇二竹内优
Owner AGC INC
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