Mechanical mixing roasting preparation method for aluminum fluoride catalyst and application thereof

Abstract

The invention discloses a mechanical mixing roasting preparation method for an aluminum fluoride catalyst and an application thereof in preparing trifluoroethylene by cracking 1,1,1,2-tetrafluoroethane. The preparation method comprises the following steps: mixing aluminum salt and fluorine-containing polymer, uniformly stirring and placing into a muffle furnace for calcining, thereby acquiring the aluminum fluoride catalyst. The aluminum fluoride catalyst compounded according to the method has higher catalytic activity and stability in the reaction for preparing trifluoroethylene by cracking 1,1,1,2-tetrafluoroethane; the catalyst preparation process is simple; the operation steps are few; the equipment requirement is low; the efficiency is high; and the repeatability is high.

Description

[0001] The invention belongs to the technical field of metal fluoride catalyst preparation, and in particular relates to a method for preparing an aluminum fluoride catalyst by mechanical mixing and roasting. The aluminum fluoride catalyst obtained by the method is cracked in 1,1,1,2-tetrafluoroethane Application in the preparation of trifluoroethylene. Background technique [0002] Hydrochlorofluorocarbons (CFCS) are a very important class of compounds in industry, and they are widely used in many fields such as refrigerants, cleaning agents, foaming agents, aerosols, and aerosol propellants. Among them, HFC-134a has been the most widely used as a refrigerant since the 20th century, but chlorofluorocarbons are very stable and have a serious destructive effect on the atmospheric ozone layer. At the same time, they are a greenhouse gas that seriously endangers human health and the living environment. , Therefore, the use of HFC-134a is gradually replaced by other refrigerants. ...

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Problems solved by technology

Its preparation process is cumbersome, produces organic waste liquid, and pollutes the environment

Similarly, in CN105597795A, nano-aluminum fluoride is prepared by adopting aluminum fluoride salts such as hydrofluoric acid and an organic alcohol phase, and the procedure is cumbersome

CN106277004A describes the preparation of aluminum fluoride catalysts by reacting aluminum hydroxide with hydrofluoric acid and fluorosilicic acid respectively. This process requires strict control of the solution temperature, harsh preparation conditions, and rare equipment

However, the anhydrous sol-gel fluorination method (Kemnitz E, AngewandteChemie International Edition, 2003, 42(35): 4251-4254) uses expensive organic metals as metal sources and anhydrous organic solvents as fluorine sources. And this method must be operated under anhydrous conditions, the process is complicated, and it is difficult to apply to industrial production

[0005] The preparation of metal fluorides based on the roasting method is not common, and the preparation of aluminum fluoride has not been reported

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