Preparation and recovery method of an ultra-low mercury catalyst with high catalytic activity

Abstract

The present invention provides a preparation method for an ultra-low mercury catalyst with high catalytic activity and a method for recycling it, including the selection of activated carbon, the preparation of adsorption liquid, and adsorption. The adsorption includes gas phase adsorption and liquid phase adsorption; the invention also provides the Catalyst recovery methods. The ultra-low mercury catalyst prepared by the invention contains, in terms of weight percentage, 1.4% mercury chloride, 2% barium chloride, 1.5% potassium chloride, 1.5% ammonium chloride platinum acid, 1% tetraammine platinum dichloride, 0.2% water, mechanical strength 97.3%, particle size 3~6mm (97.8%), bulk density 515g / l; high catalytic activity, acetylene conversion rate reaches 99.92-99.93%, vinyl chloride selectivity is nearly 100%, vinyl chloride The yield reaches 94.9-95.0%; the ultra-low mercury catalyst prepared by the invention has low unit consumption, low dosage and high catalytic efficiency; the catalyst recovery method of the invention has a high mercury chloride recovery rate and high purity.

Description

technical field [0001] The invention relates to the preparation and recovery method of an ultra-low mercury catalyst with high catalytic activity, belonging to the technical field of fine chemistry. Background technique [0002] At present, the industrial acetylene hydrochlorination reaction mainly uses high-mercury catalysts with a loading of mercuric chloride of 12% to 15%, and its consumption of mercury accounts for 60% of the domestic mercury consumption, and it is harmful to the environment and human beings. Serious hazard to health. [0003] In view of the scarcity of mercury resources and the pollution of the environment, as well as the increasingly stringent policies on the prevention and control of mercury pollution at home and abroad, there is an urgent need for breakthroughs in the improvement of the performance of mercury chloride and the research of high-performance and environmentally friendly catalysts to meet the needs of industrial production. At the same t...

AI Technical Summary

Problems solved by technology

[0005] (1) High mercury content and poor mechanical properties;

[0006] (2) For the synthesis reaction of vinyl chloride, the catalytic effect of the catalyst is not ideal, the catalytic activity is not high, the conversion rate of acetylene, the selectivity of vinyl chloride, and the yield of vinyl chloride are low;

[0007] (3) High unit consumption and large dosage;

[0008] (4) Low catalytic efficiency;

[0010] (6) It is used in the synthesis reaction of vinyl chloride, and the activation time of hydrogen chloride is longer;

[0011] (7) When the catalyst is recovered, the recovery rate of mercuric chloride is low, the purity is low, and the recovered activated carbon has poor performance