Catalyst and application thereof in preparation of heptafluoropropane

Abstract

The invention discloses a catalyst. The catalyst is prepared from a mixture of at least three selected from the group consisting of metal fluorides and metal oxides, clay which is fully soaked in hydrofluoric acid, dried and crushed, and rice husk carbon which is fully soaked in hydrofluoric acid and dried according to a mass ratio of 1: (1-3): (1-3). The invention also discloses application of the catalyst in preparation of heptafluoropropane. The raw materials used by a fluorination catalytic system in the invention are cheap and easily available; cost is low; no polymer is enriched in the reaction process; the service life of the catalyst is greatly prolonged; a preparation method for the catalyst is simple in process, low in equipment requirement and mild in reaction conditions, and the conversion rate of the raw materials reaches 95% or above; and the fluorination catalytic system is non-decomposable and non-flammable in a dry environment, and can be continuously used.

Description

technical field [0001] The invention relates to a catalyst and the application of the catalyst, belonging to the technical field of industrial catalysis. Background technique [0002] As a substitute for Halon 1301, heptafluoropropane (HFC-227) has gradually become the main variety of indoor fire extinguishing agent. Heptafluoropropane is a colorless and odorless gas at room temperature, non-conductive, non-corrosive, no environmental restrictions, and has a short atmospheric storage period. Although heptafluoropropane is relatively stable at room temperature, it will decompose at high temperature and produce hydrogen fluoride, which is harmful to human body. Other combustion products include carbon monoxide and carbon dioxide. Since heptafluoropropane does not contain chlorine or bromine, it will not damage the atmospheric ozone layer, so it is used to replace Halon 1301 and Halon 1211, which are harmful to the environment, as raw materials for fire extinguishing agents. ...

AI Technical Summary

Problems solved by technology

Although heptafluoropropane is relatively stable at room temperature, it will decompose at high temperature and produce hydrogen fluoride, which is harmful to human body

However, the catalytic chlorofluorination process in this method is relatively complicated, and the recycling of raw materials is also difficult to industrialize, and the technology is relatively difficult.