Catalyst for 1,1-difluoroethane producing vapor process

Abstract

The catalyst for preparing 1, 1-difluoroethane includes Cr element and one or two other metal elements of Co, Mn, Zn, Fe, Mg, Al and Ni in the molar ratio of 1 to 0.001-0.6, as well as F element and O element. The Cr base catalyst has less environmental pollution, high activity, high stability, long service life, no tendency of polymerizing 1, 1-difluoroethane, great contact area, fast reaction, high space time yield and easy regeneration. When the reaction is controlled in 150-200 deg.c, the reaction pressure has no influence on the variety of the reaction products, and the reaction products have less side products. The catalyst is prepared through a simple co-precipitation process.

Description

technical field

[0001] The present invention relates to a catalyst for producing 1,1-difluoroethane by gas phase method. Background technique

[0002] 1,1-Difluoroethane, the current international common name HFC-152a, is a widely used fluorine-containing organic compound, which can be used as a refrigerant and spray as a raw material for the production of fluoroplastics, especially its ozone-destroying The potential value (ODP) is 0, and the global warming potential value (GWP) is 0.02. As a substitute for CFC, it is attracting more and more attention. The conventional production method of 1,1-difluoroethane is to use vinyl chloride as a raw material for production, and it is also useful to use acetylene as a raw material for production.

[0003] In the disclosed patent documents, the methods for producing with vinyl chloride as raw materials all adopt the liquid phase method for production. In the patent 97192750, the catalyst used in the production of difluoroethane by ...

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