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1-chloro-2,3,3,3-tetrafluoropropene manufacturing method

A manufacturing method, the technology of tetrafluoropropene, applied in the direction of organic chemical methods, chemical instruments and methods, dehalogenation preparation, etc., can solve the problems of unrecorded methods, and achieve the effect of easy implementation and high selectivity

Active Publication Date: 2018-11-09
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above Patent Document 1 describes the conditions and method for obtaining HFO-1234yf as the target substance in high yield in the method of reducing 1214ya with hydrogen, but does not describe the method for obtaining 1224yd as a by-product with good efficiency.
That is, in the method of Patent Document 1, although a certain amount of 1224yd is produced, a large amount of HFO-1234yf which is an overreduced form of 1224yd and its further reduced form are produced as by-products 1,1,1 ,2-Tetrafluoropropane (CF 3 CHFCH 3 , HFC-254eb) problems

Method used

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Embodiment

[0095] The present invention will be described in detail below by showing Examples and Comparative Examples. However, the present invention is not limited to the following description. Examples 1-4 are examples, and Examples 5-8 are comparative examples.

[0096] First, the palladium catalyst-supporting carrier used in each example was prepared as follows. Palladium catalyst-carrying carriers (X1) to (X3) are palladium catalyst-carrying carriers of the present invention, and palladium catalyst-carrying carriers (Cf1) to (Cf3) are palladium catalyst-carrying carriers for comparative examples. In addition, in the preparation of each palladium catalyst supporting carrier, palladium-supported activated carbon (N.E. Chemkit Co., Ltd.); hereinafter referred to as "palladium-supported activated carbon (A)"). The specific surface area of ​​the palladium catalyst (palladium simple substance) supported in the palladium-supported activated carbon (A) is 198m as measured by the above-m...

preparation example 1

[0098] Palladium-supported activated carbon (A) was heat-treated at a temperature of 750°C for 10 hours in nitrogen to obtain a specific surface area of ​​supported palladium of 6 m 2 / g of the palladium catalyst carrier (X1).

preparation example 2

[0100] Except that the heat treatment temperature in Preparation Example 1 was changed to 600°C, the specific surface area of ​​supported palladium was 20m2 in the same manner as in Preparation Example 1. 2 / g of the palladium catalyst carrier (X2).

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Abstract

In a method for obtaining 1-chloro-2,3,3,3-tetrafluoropropene(1224yd) by reducing 1,1-dichloro-2,3,3,3-tetrafluoropropene(1214ya), provided is a method for efficiently manufacturing 1224yd, wherein generation of by-products such as 2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoropropane that are over-reductants is suppressed. This 1-chloro-2,3,3,3-tetrafluoropropene manufacturing method is characterized by reacting, in a gaseous phase, 1,1-dichloro-2,3,3,3-tetrafluoropropene with hydrogen in the presence of a palladium catalyst-supporting carrier in which a palladium catalyst having a specific surface area of 40 m2 / g or less is supported on a carrier.

Description

technical field [0001] The present invention relates to a method for producing 1-chloro-2,3,3,3-tetrafluoropropene. Background technique [0002] 1-Chloro-2,3,3,3-tetrafluoropropene (CF 3 CF=CHCl, HCFO-1224yd. The following is also recorded as 1224yd. ) is substituted 3,3-dichloro-1,1,1,2,2-pentafluoropropane (CF 3 -CF 2 -CHCl 2 , HCFC-225ca) and 1,3-dichloro-1,1,2,2,3-pentafluoropropane (CClF 2 -CF 2 -CClFH H , HCFC-225cb) and other novel chlorofluorocarbons that can be used for cleaning agents, refrigerants, blowing agents, solvents, and aerosol applications, etc., with low greenhouse effect potential (GWP) and low environmental load on the earth. [0003] In this specification, the compound abbreviation of a halogenated hydrocarbon is described in the parentheses after a compound name, and the abbreviation is used instead of a compound name in this specification as needed. [0004] 1224yd has a Z form and an E form as geometric isomers depending on the position o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/23C07C21/18C07B61/00
CPCC07C17/23C07C21/18C07B61/00B01J21/18B01J23/42
Inventor 野村真吾冈本秀一高木洋一
Owner AGC INC
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