Mercuric chloride low-mercury catalyst and preparation method thereof

Abstract

The invention provides a mercuric chloride low-mercury catalyst and a preparation method thereof. The catalyst adopts active carbon as a carrier to adsorb mercuric chloride, and the formula of the catalyst comprises 8.0 to 10.0 percent of mercuric chloride, 8 to 13 percent of rare earth chloride assistant A, 5 to 25 percent of alkaline earth metal chloride assistant B, 10 to 20 percent of assistant C, and the balance of active carbon. The preparation method comprises the following steps: firstly, soaking the active carbon in hydrochloric acid solution at low temperature for standby; simultaneously dissolving the mercuric chloride, the assistant A, the assistant B and the assistant C together, and soaking the active carton in the solution; performing low-temperature pre-drying on an intermediate product; continuously drying the catalyst; and finally pumping a product at vacuum into a storage silo, packaging and leaving factory. The catalyst can reduce resource consumption and the pressure of treating mercury pollution; simultaneously the production cost is reduced, the poisoning resistance, reduction resistance and loss resistance are greatly improved, the catalytic performance of the catalyst is fully guaranteed, the using time can be prolonged and the using consumption can be reduced; and the catalyst is suitable for polyvinyl chloride manufacturers.

Description

technical field [0001] The present invention relates to catalysts containing halides, in particular to mercuric chloride catalysts, and also to methods for their preparation. Background technique [0002] Mercury chloride is well known as a catalyst for the synthesis of vinyl chloride. In the existing mercuric chloride catalyst, the content of mercuric chloride is usually 10.5% to 12.5%. When it is used to synthesize vinyl chloride, the recovered waste catalyst contains about 3% mercuric chloride, which shows that the catalytic process consumes more than 7.5%. If calculated according to the 10.5% mercuric chloride content in the original model, 75 kg of mercuric chloride will be consumed for every 1 ton of mercuric chloride catalyst used. If the production capacity of calcium carbide polyvinyl chloride in my country is 10Mt, 10kt of mercuric chloride catalyst is needed every year, and 750t of mercuric chloride is consumed. [0003] After searching, there are not many Chin...

AI Technical Summary

Problems solved by technology

Their mercuric chloride content is more than 10.5%, and there are problems of high consumption of mercuric chloride and serious pollution.

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