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Method for producing trifluoroethylene

A technology of trifluoroethylene and a manufacturing method, which is applied in chemical instruments and methods, halogenated hydrocarbon preparation, halogenated hydrocarbon disproportionation preparation, etc., can solve the problems of increased amount of by-products, long reaction time, blockage of polymer by-products, etc. Achieve the effect of reducing cost and small greenhouse effect coefficient

Inactive Publication Date: 2016-02-17
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the production methods using the catalyst process described in Patent Documents 1 to 3 have many economic disadvantages, such as catalyst preparation, replacement of catalyst in a catalyst-filled reactor accompanied by catalyst deactivation, catalyst waste or reactivation, catalyst Possibility of filling the reactor with clogging by polymer by-products, long reaction times, etc.
In addition, in the methods shown in Patent Document 1 and Patent Document 3, hydrogen reduction is excessively performed, and the amount of by-products generated increases, so that high-purity HFO-1123 cannot be obtained in a sufficiently high yield.

Method used

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  • Method for producing trifluoroethylene
  • Method for producing trifluoroethylene
  • Method for producing trifluoroethylene

Examples

Experimental program
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Effect test

example 1

[0079] use figure 1 In the reaction apparatus shown, crude HFO-1123 was obtained by reacting as follows from a raw material gas composed of R31, R22, and TFE.

[0080] R31 was continuously introduced into a stainless steel tube preheater 2a in an electric furnace set at a furnace temperature of 300°C, and R31 was preheated to 300°C. In addition, R22 was continuously introduced into a preheater 3a made of stainless steel tubes in an electric furnace set at 300°C to preheat R22 to 300°C. Then, TFE was continuously introduced into a preheater 4a made of stainless steel tube in an electric furnace whose temperature was set at 300°C, and TFE was preheated to 300°C.

[0081] The steam (steam) heated by the heating steam generator 5a which is an electric furnace whose inner temperature is set to 850°C was supplied to the reactor 1 whose internal temperature was controlled to be 850°C under 0.04 MPa. And, these raw material gas components (R31, R22 and TFE) after preheating are supp...

example 2

[0097] The reaction was performed under the same conditions as in Example 1, except that the preset temperature of the electric furnace for heating steam was 800°C, and the internal temperature of the reactor was controlled at 800°C. 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.

example 3

[0099] The reaction was carried out under the same conditions as in Example 1, except that the set temperature of the electric furnace for heating steam was 750°C, and the internal temperature of the reactor was controlled at 750°C. 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.

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Abstract

Provided is an economically advantageous method for efficiently and at a high purity producing HFO-1123, which is industrially useful, by means of a synthesis reaction that uses easily acquired starting materials, does not use a catalyst, and accompanies pyrolysis, in a manner such that the generation is suppressed of by-products difficult to separate by means of distillation from HFO-1123, particularly HFO-1132(E). The method for producing HFO-1123 from R31, R22, and TFE has (a) a step for supplying R31, R22, and TFE to a reaction vessel in a separate or pre-mixed manner, (b) a step for supplying a heat medium to the reaction vessel, and (c) a step for generating HFO-1123 by contacting R31, R22, TFE, and the heat medium together in the reaction vessel in the state of the temperature of within the reaction vessel being controlled to 400-950 DEG C.

Description

technical field [0001] The present invention relates to a method for producing trifluoroethylene, and relates to a method for producing trifluoroethylene with good productivity by using chlorofluoromethane, chlorodifluoromethane, and tetrafluoroethylene as raw materials. Background technique [0002] In the present specification, for halogenated hydrocarbons, the abbreviation of the compound is written in parentheses after the name of the compound. In addition, in this specification, an abbreviation is used instead of a compound name as needed. Trifluoroethylene (HFO-1123) has a small greenhouse effect coefficient (GWP), so it is used as an alternative to the greenhouse effect gas difluoromethane (HFC-32) or 1,1,1,2,2-pentafluoroethane (HFC-125 ) new refrigerants have been highly anticipated in recent years. [0003] As a method for producing HFO-1123, a method of reducing chlorotrifluoroethylene (CTFE) by hydrogen in the presence of a palladium or platinum catalyst (for e...

Claims

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Application Information

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IPC IPC(8): C07C17/37C07C21/18
CPCC07C17/269C07C17/37C07C21/18
Inventor 竹内优古田昇二
Owner ASAHI GLASS CO LTD
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