Preparation method of vinylidene fluoride and preparation method of catalyst used by same

A vinylidene fluoride and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, preparation of halogenated hydrocarbons, etc., can solve difficult maintenance, poor product selectivity, and low conversion rate. and other problems, to achieve good economic and social benefits, improve selectivity and yield, and improve the effect of conversion rate

Active Publication Date: 2015-05-20
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Incineration treatment is to completely decompose trifluoromethane into hydrogen fluoride, carbon dioxide and other substances to avoid harm to the environment, but this method is very uneconomical because it cannot recover any by-products and consumes a lot of energy. After the world cancels carbon trading It is difficult for enterprises to maintain without financial support
At present, in view of factors such as cost, the conversion and utilization of trifluoromethane has not yet been industrialized
[0005] Trifluoromethane is very stable, and it is very d

Method used

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  • Preparation method of vinylidene fluoride and preparation method of catalyst used by same
  • Preparation method of vinylidene fluoride and preparation method of catalyst used by same
  • Preparation method of vinylidene fluoride and preparation method of catalyst used by same

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Pass trifluoromethane, methane and oxygen into the reactor without catalyst at a ratio of 1:1:0.25 (molar ratio), at a temperature of 850°C, a pressure of 2bar, and a space velocity of 5000h -1 Under the conditions of the reaction, the conversion rate of trifluoromethane is 52%, the conversion rate of methane is 48%, the selectivity of vinylidene fluoride is 67%, other main by-products are tetrafluoroethylene, and other small by-products are ethylene, ethane , difluoromethane, monofluoroethylene, trifluoroethylene and hexafluoropropylene.

Embodiment 2

[0030] Pass trifluoromethane, methane and oxygen at a ratio of 1:1:0.25 (molar ratio) into a reactor containing 50ml of lanthanum oxide catalyst, at a temperature of 850°C, a pressure of 2bar, and a space velocity of 5000h -1 react under the conditions. The conversion rate of trifluoromethane is 89%, the conversion rate of methane is 78%, the selectivity of vinylidene fluoride is 87%, other main by-products are tetrafluoroethylene, and other small by-products are ethylene, ethane, difluoromethane, a Fluoroethylene, trifluoroethylene and hexafluoropropylene.

Embodiment 3

[0032] Feed nitrogen, difluorochloromethane, methane and oxygen into a reactor containing 50ml of cerium oxide catalyst at a temperature of 700°C, a pressure of 2bar, and a space velocity of 5000h at a ratio of 20:2:2:1 (molar ratio). -1 react under the conditions. The conversion rate of difluorochloromethane is 100%, the conversion rate of methane is 38%, the selectivity of vinylidene fluoride is 57%, and other main by-products are trifluoromethane, acetylene, ethylene, tetrafluoroethylene, ethane, and other small by-products The products are ethylene, ethane, difluoromethane, monofluoroethylene, trifluoroethylene and hexafluoropropylene.

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Abstract

The invention discloses a preparation method of vinylidene fluoride and a preparation method of a catalyst used by the same. The preparation method of vinylidene fluoride comprises the following steps: mixing methane, oxygen and fluoroform or monochlorodifluoromethane or the mixed gas of fluoroform and monochlorodifluoromethane at any ratio or the mixed gas of multiple gases including fluoroform and monochlorodifluoromethane; adding O2 at a certain proportion, and reacting at a temperature of 550-1,050 DEG C under a total pressure of 1-10bar and at an air speed of 50-10,000h<-1>; and reacting in the presence of a catalyst to generate vinylidene fluoride. According to the method disclosed by the invention, the vinylidene fluoride with relatively high added value is generated under a catalytic action from several waste fluoroform raw materials which are cheap or need forced treatment, has relatively high added value, and brings good economic and social benefits.

Description

technical field [0001] The present invention relates to a preparation method for the production of vinylidene fluoride and the catalyst used therefor, in particular to a method of reacting methane, oxygen and trifluoromethane or chlorodifluoromethane in the presence of a catalyst to produce a vinylidene fluoride with high added value. A method for preparing vinylidene fluoride and a method for preparing a catalyst used therefor. Background technique [0002] Vinylidene fluoride is also called 1,1-difluoroethylene, and its molecular formula is CH 2 =CF 2 , is one of the important monomers in the fluorine chemical industry. Vinylidene fluoride is mainly used in the production of polyvinylidene fluoride (PVDF) and fluororubber (FKM). Polyvinylidene fluoride is a kind of thermoplastic engineering plastic with excellent comprehensive performance and wide application. It is mainly used in chemical equipment, electronic appliances, piezoelectric materials, lithium batteries and ...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/266B01J23/10B01J23/755B01J23/04B01J23/06B01J23/84B01J23/34
Inventor 韩文锋李雨臻唐浩东李瑛刘化章
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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