Method for preparing low mercury catalyst by using activated carbon with high carbon tetrachloride adsorption value

Abstract

The present invention provides a method for preparing a low mercury catalyst by using activated carbon with a high carbon tetrachloride adsorption value. The method comprises gas phase adsorption, absorption solution preparation and microwave absorption. The microwave absorption comprises first-stage microwave absorption. The first-stage microwave absorption is performed at the temperature of 60 DEG C, the microwave wavelength is 139 mm, the frequency is 2650 MHz, the power is 310 w, and the adsorption treatment lasts for 10 minutes. The method has the beneficial effects that the low mercury catalyst prepared by the method provided by the present invention comprises the following components in percentages by weight: 4.91% of chlorinated mercury, 4% of zinc chloride, 2% of palladium chloride, 2% of platinum chloride, 2% of tetrabutyl ammonium chloride, 2% of triphenylphosphine sulfonic acid potassium and 0.20% of water; the mechanical strength is 99.6%, the particle size is 3-6 mm (99.8%), and the bulk density is 516 g / L; and In the synthesis reaction of vinyl chloride, the conversion rate of acetylene reaches 99.98%, and the yield of the vinyl chloride reaches 97.3%.

Description

technical field [0001] The invention relates to a method for preparing a low-mercury catalyst by using activated carbon with a high carbon tetrachloride adsorption value, and belongs to the technical field of fine chemistry. Background technique [0002] In the reaction of acetylene hydrochlorination to prepare vinyl chloride, it has been reported at home and abroad that noble metals such as platinum, palladium, and gold are used as the main catalytic components. Although the activity is high, the stability is not as good as that of high mercury catalysts, and the cost is too high to be Realize industrial production, and when using tin, bismuth, copper, zinc and other base metal compounds as main catalyst components, the loss of its active components is more serious. [0003] The mercury chloride content of high-mercury catalysts is 10-12%. Due to the high mercury chloride content of high-mercury catalysts and high mercury consumption, they are now being phased out, and the ...

AI Technical Summary

Problems solved by technology

[0006] (1) The mechanical properties of the catalyst itself are poor;

[0007] (2) Used in the synthesis reaction of vinyl chloride, the conversion rate of acetylene is low, and the yield of vinyl chloride is low;

[0010] (5) Used in the synthesis reaction of vinyl chloride, the catalytic efficiency is low