Method for preparing fluorine-containing ethylene by catalytic cracking of 2-chloro-1,1-difluoroethane

A technology of difluoroethylene and difluoroethane, which is applied in the field of preparing fluorine-containing ethylene by catalytic cracking of 2-chloro-1,1-difluoroethane, can solve the problem of high reaction temperature, no industrial application value, high conversion rate and poor performance. Selectivity can not meet the requirements and other issues
CN110776394AActive Publication Date: 2020-02-11SHANGHAI 3F NEW MATERIAL TECH CO LTD +1
10 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI 3F NEW MATERIAL TECH CO LTD
Publication Date
2020-02-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention disclose a method for preparing fluorine-containing ethylene by catalytic cracking of 2-chloro-1,1-difluoroethane. The method comprises the following steps that (i), a catalytic crackingcatalyst is provided, wherein the catalyst comprises fluoride carried on active carbon, the weight ratio of the active carbon to the fluoride is 1 to (0.01-0.5), and the fluoride is selected from aluminum fluoride, chromium fluoride, potassium fluoride, magnesium fluoride, calcium fluoride, or a mixture of two or more of the aluminum fluoride, chromium fluoride, potassium fluoride, magnesium fluoride and calcium fluoride; (ii), the catalyst is loaded into a catalytic cracking reactor, a mixture of preheated inert gas and the 2-chloro-1,1-difluoroethane is introduced, and the catalyst is activated; and (iii), the mixture of preheated 2-chloro-1,1-difluoroethane and inert gas is introduced, the reaction temperature is 400-700 DEG C, space velocity is 200-3000h<-1>, pressure is 0.1-1.0Mpa, and 1,1-dichloroethylene is obtained.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for preparing fluorine-containing ethylene by catalytic cracking of 2-chloro-1,1-difluoroethane. The method of the invention has improved selectivity of fluorine-containing ethylene. Background technique

[0002] Fluorinated ethylene has always been the core raw material monomer of fluoropolymer products, such as 1-fluoroethylene, 1,1-difluoroethylene, chlorotrifluoroethylene, trifluoroethylene, tetrafluoroethylene, etc. The annual global production capacity of 1,1-difluoroethylene reaches tens of thousands of tons, which is used to produce PVDF resin and mixed copolymer to produce fluororubber. PVDF resin is used in the production of various films, high-performance materials, adhesives and high-quality coatings. Viton has good heat resistance, corrosion resistance, aging resistance and excellent mechanical properties. In addition, 1,2-difluoroethylene and 2-chloro-1-fluoroethylene can also be used as monomers of flu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More