Catalyst for preparing chlorotrifluoroethene from trichlorotrifluoroethane through catalytic hydrodechlorination and preparation method of catalyst

Abstract

The invention discloses a catalyst for preparing chlorotrifluoroethene from trichlorotrifluoroethane through catalytic hydrodechlorination and a preparation method of the catalyst. The method comprises steps as follows: SiO2 particles are roasted at a temperature of 400 DEG C; a mixed solution containing CoC12.6H2O or RhCl3.3H2O, CrCl3.6H2O or MnCl2.4H2O, KCl.6H2O or perrhenic acid and Ni (H2PO2).6H2O is prepared; the SiO2 particles are subjected to isometric impregnation and dried at a temperature of 60-80 DEG C for 12-16 h; dried substances are put into a tube furnace, nitrogen is introduced, the temperature is raised to 240-300 DEG C at the speed of 6-8 DEG C / min, the reaction pressure is 0-2 MPa, and the reaction time is 4 h; products are naturally cooled to the room temperature, and O2 containing 2% of N2 is introduced for passivating treatment for 4 h. The prepared catalyst contains 0.1%-15% of Co or Rh, 0.5%-22% of Cr or Mn and 0.1%-5% of alkali metal K or rare-earth metal Re. The catalyst has the advantages of high activity, good stability, good reaction selectivity, mild reaction condition and the like.

Description

technical field [0001] The invention relates to a catalyst for preparing trifluorochloroethane by catalytic hydrodechlorination of trifluorotrichloroethane. Background technique [0002] Chlorotrifluoroethylene (CTFE), also known as chlorotrifluoroethylene, is one of the important monomers for the synthesis of fluorine-containing materials. It can produce fluorine resins, fluorine coatings, fluorine rubber and chlorofluorolubricants through homopolymerization and copolymerization. These materials have Very good chemical inertness and high temperature resistance, widely used in cutting-edge technology, military navigation and electronics industry. The reduction dechlorination method of trifluorotrichloroethane zinc powder is a traditional technique for producing chlorotrifluoroethylene, which is relatively mature in industrial development, but still has many disadvantages: 1. the production equipment is huge, and the initial investment is more; 2. .Reaction selectivity is lo...

AI Technical Summary

Problems solved by technology

The reduction dechlorination method of trifluorotrichloroethane zinc powder is a traditional technique for producing chlorotrifluoroethylene, which is relatively mature in industrial development, but still has many disadvantages: 1. the production equipment is huge, and the initial investment is more; 2. .Reaction selectivity is low, and side reactions are many; 3. The amount of zinc powder used is much larger than the theoretical amount, and the generated zinc chloride is difficult to handle, and the recovery of solvent methanol and ethanol is difficult, which will cause relatively large pollution to the environment

[0006] The catalysts reported above all have defects such as low activity, easy deactivation and poor stability. It is particularly important to develop a new catalyst with high activity and strong stability.