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Method for producing 1-chloro-1,2-difluoroethylene

一种二氟乙烯、氯氟乙烷的技术，应用在1－氯－1,2－二氟乙烯的制造领域，能够解决再利用氯化物、成本高等问题

Pending Publication Date: 2019-03-01
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has been pointed out that there are problems such as the use of zinc as a catalyst, the production of insoluble waste that is complicated to deal with in the reaction equivalent, and the need to perform the reaction in a batch manner, resulting in high cost.
However, in this method, there is a problem that a reactant for carrying out the dehydrochlorination reaction is required in an equivalent amount, and chlorides and the like cannot be reused in the reaction in an equivalent amount.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] 20.0 g of the activated carbon-supported palladium catalyst (supported amount: 0.5% by mass) was filled in a tubular Hastelloy reactor having an inner diameter of 15 mm and a length of 1 m. The reactor was maintained at atmospheric pressure (0.1MPa) and 150°C, hydrogen gas was supplied at a flow rate of 60cc / min (the flow rate at 0°C and 0.1MPa, the same below), and chlorotrifluoroethylene (CTFE) gas was supplied at a flow rate of 60cc / min The flow rate of , and nitrogen was supplied to the reactor at a flow rate of 480 cc / min for 2 hours. The reactor outlet gas was analyzed by gas chromatography (GC). As a result, the conversion rate of CTFE was 64%, CHF 2 CHFCl: 62%, CHF 2 CH 2 F: 25%, CH 2 FCH 2 F: 5%, others: 8% selectivity to get CHF 2 CHFCl.

Embodiment 2

[0145] 20.0g of γ-alumina catalyst (specific surface area 400m 2 / g) was filled in a tubular Hastelloy reactor with an inner diameter of 15 mm and a length of 1 m. The reactor was maintained at atmospheric pressure (0.1MPa) and 350°C, CHF 2 CHFCl gas was supplied to the reactor at a flow rate of 4 cc / min, and nitrogen gas was supplied to the reactor at a flow rate of 20 cc / min for 2 hours. The reactor outlet gas was analyzed by GC, the result was CHF 2 CHFCl conversion rate 82%, CHF=CFCl: 80%, CHF=CHF: 11%, others: 9% selectivity to get CHF=CFCl.

Embodiment 3

[0147] Magnesium fluoride catalyst 20.0g (specific surface area 15m 2 / g) was filled in a tubular Hastelloy reactor with an inner diameter of 15 mm and a length of 1 m. The reactor was maintained at atmospheric pressure (0.1 MPa) and 450° C. CHFCl CHFCl gas was supplied to the reactor at a flow rate of 4 cc / min, and nitrogen gas was supplied to the reactor at a flow rate of 20 cc / min for 2 hours. The gas at the outlet of the reactor was analyzed by GC. As a result, CHFC=CFCl was obtained at a selectivity of CHFCl CHFCl conversion rate of 56%, CHF=CFCl: 82%, CHF=CHF: 12%, and others: 6%.

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PUM

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Abstract

The present invention provides a method for producing a 1-chloro-1,2-difluoroethylene at low cost and with high efficiency. More specifically, the present invention provides a method for producing a 1-chloro-1,2-difluoroethylene, said method comprising a step of dehydrohalogenating a chlorofluoroethane represented by general formula (1): CFClX1-CHFX2, wherein X1 and X2 are different from each other and independently represent H, F or Cl, provided that either one of X1 and X2 represents H.

Description

technical field [0001] The present invention relates to a method for producing 1-chloro-1,2-difluoroethylene. Background technique [0002] 1-Chloro-1,2-difluoroethylene (CFCl=CHF; HCFO-1122a) is promising as a refrigerant with a low global warming coefficient (GWP) (see Patent Document 1). [0003] As a method for producing 1-chloro-1,2-difluoroethylene, for example, a halogenated ethane represented by the formula: CFClX-CHFX (wherein each X represents Cl, Br or I) is known as a raw material, A method of performing a dehalogenation reaction in the presence of a catalyst such as zinc; a method of reducing 1,2-dichloro-difluoroethylene (CFCl=CFCl) using a silane compound, etc. (see Patent Document 2 and Non-Patent Document 1 to 3). However, it has been pointed out that this method has problems such as the use of zinc as a catalyst, the generation of insoluble waste which is complicated to deal with in the reaction equivalent, and the need to perform the reaction in a batch ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C21/18C07B61/00
CPCC07B61/00C07C17/25C07C17/354C07C21/18C07C19/12
Inventor 加留部大辅大石训司
Owner DAIKIN IND LTD
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