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Method for preparing 1, 1-difluoroethylene from R143a

A vinylidene fluoride, cracking reactor technology, applied in separation methods, dehydrohalogenation preparation, chemical instruments and methods, etc., can solve the problems of low selectivity and purity, inconvenient catalyst replacement, low reaction conversion rate, etc. Uniform temperature distribution, durable and reliable fixation, good catalytic effect

Active Publication Date: 2022-04-08
ZHEJIANG SANMEI CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The production process of R143a (1,1,1-trifluoroethane) to prepare 1,1-difluoroethylene can be carried out by catalytic cracking at low temperature, and the energy consumption is low. It is a commonly used 1,1-difluoroethylene Ethylene fluoride preparation process, but there are problems such as severe cracker corrosion, low reaction conversion rate, high impurity content, low selectivity and purity of 1,1-difluoroethylene, catalyst loss and easy deactivation, and catalyst replacement is inconvenient

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  • Method for preparing 1, 1-difluoroethylene from R143a
  • Method for preparing 1, 1-difluoroethylene from R143a
  • Method for preparing 1, 1-difluoroethylene from R143a

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Embodiment Construction

[0041] Such as Figure 1 to Figure 9 As shown, a method for preparing 1,1-difluoroethylene for R143a of the present invention comprises the following steps:

[0042] (a) Preparation: preparation of supported catalyst: the sheet-shaped activated carbon is boiled and washed with nitric acid for 1-2 hours to clean the pores of the activated carbon and play the role of pore expansion. Then wash it with deionized water, measure the pH value of the water with a pH meter, and stop washing when the pH value is 6.5-7; then soak the activated carbon in the metal chloride solution for 8-10 hours, and filter it at 100-110 ° C Dry it in a desiccator for 8-10 hours before use. The metal chloride is selected from barium chloride, ferric chloride, and copper chloride, which can promote the cracking of R143a. The metal chloride solution is preferably 20% by mass fraction. CuCl 2 solution, the impregnation method is used to prepare the catalyst, which is easy to operate, and solves the curren...

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Abstract

The invention discloses a method for preparing 1, 1-difluoroethylene from R143a, which comprises the following steps: (a) preparing; (b) cracking; and (c) impurity removal. The method is simple in process, easy to operate and control, convenient in catalyst replacement, good in catalytic effect, high in reaction conversion rate, high in final product selectivity and low in impurity content, and ensures the purity of the final product.

Description

technical field [0001] The invention belongs to the technical field of 1,1-difluoroethylene preparation, and in particular relates to a method for preparing 1,1-difluoroethylene with R143a. Background technique [0002] 1,1-Difluoroethylene (also known as vinylidene fluoride or VDF) is one of the important varieties of fluorine-containing olefins, mainly used in the production of polyvinylidene fluoride resin, fluororubber and fluorine-containing copolymers such as vinylidene fluoride-hexafluoro Propylene, vinylidene fluoride-vinylidene fluoride, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene, etc. In addition, fluorine rubber obtained by copolymerization of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene has become an indispensable and substitute in modern industry, especially in high-tech fields, because of its excellent high temperature resistance, oil resistance, solvent resistance and physical and mechanical properties. One of the basic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C17/38C07C21/18B01J8/02B01D53/26B01D53/04B01D46/10
Inventor 王晓东何胜何伟国张晓亮张东徐建华
Owner ZHEJIANG SANMEI CHEM IND