Method for preparing mercury-free catalyst for preparing chloroethylene by acetylene hydrochlorination

Abstract

The invention provides a new method for preparing a noble metal catalyst for chloroethylene reaction with acetylene. In the method, active carbon and molecular sieve are used as carriers, ruthenium trichloride of noble metal chloride is used as an active center, the active center is carried on the carriers by adopting an immersion method, and the novel catalyst is obtained by means of drying and the like; the catalyst shows high activity and selectivity in the application in preparing the chloroethylene by acetylene hydrochlorination; and the method has the characteristics of simple process, short production period, safe and environment-friendly raw materials and low equipment cost. Compared with the current widely-applied carried mercuric chloride catalyst, the ruthenium trichloride active center has the advantages that: although the price is relatively high, the consumption of the ruthenium trichloride active center is extremely low in the preparation, so the cost is low; and because of extremely low toxicity, the catalyst can be taken as a good substitute for a mercury-containing catalyst.

Description

technical field [0001] The invention proposes a new method for a noble metal catalyst applied to the reaction of preparing vinyl chloride from acetylene. The method adopts activated carbon as a carrier, takes precious metal chloride ruthenium trichloride as an active center, adopts an impregnation method to load the active center on the carrier, and obtains a novel catalyst by drying and other means; the feature of the present invention is that the process adopted is simple , the production cycle is short, the raw materials used are safe and environmentally friendly, and the cost of equipment required is low. Compared with the currently widely used supported mercury chloride catalyst, the active center ruthenium trichloride used is relatively expensive, but the amount used in the preparation is extremely low, so the cost is also low. With low toxicity and extremely low toxicity, it can be regarded as an excellent substitute for mercury-containing catalysts. In the application...

AI Technical Summary

Problems solved by technology

The purpose is to propose a new catalyst that can replace mercury in view of the high toxicity of the existing mercury-containing catalysts and its great harm to the environment, so as to reduce the environmental hazards of industrial production of vinyl chloride