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

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 ...

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 difficult to activate it. In previous studies, it was found that the conversion rate is still low even with a catalyst below 500 °C, and the conversion rate above 800 °C can meet the requirements of industrialization, but the product selectivity is poor. Product separation and Purification costs are high and there is no benefit

[0006] The catalytic activation of methane is also a difficult problem. Although many scientists use various means and methods to convert it into high value-added products, there is still no large-scale industrialization method so far.

Images