Composite metal chloride catalyst and its production process

Abstract

This invention is a complex metal chloride catalyst. Its carrier is active carbon with void ratio>=0.56cm3 / g, specific surface area>= 1000m2 / g, mechanical strength>=90%, and it is made by absorbing mercuric chloride and zinc chloride under condition of 92-96 degree centigrade. Computing as weight percentage, the mercuric chloride is 2-8%, zinc chloride 1-15%. Its advantage is that 1. Mercuric chloride content is low, but activity and stability is boosted 5-20% and 10-20% comparing to existing mercuric chloride catalyst. 2. Mercuric chloride using level can be reduced according to the boost of activity and stability and the catalyst activity is not reduced, and catalyst producing cost is reduced, mercury resource consumption is reduced. Otherwise, catalyst useful life can be prolonged, its dosage can be reduced, and catalyst replacing time is economized, so vinyl chloride producing cost is reduced. 3. Catalyst consumption is few, mercury drain is few. So the damage of drained mercury to environment and product is lightened.

Description

technical field [0001] The invention relates to a catalyst for the synthesis of vinyl chloride by addition reaction of hydrogen chloride gas and acetylene gas and its production process, in particular to a composite metal chloride catalyst and its production process. Background technique [0002] At present, domestic enterprises use hydrogen chloride gas and acetylene gas to carry out addition reaction to synthesize vinyl chloride. Most of the catalysts used are columnar activated carbon with a diameter of 3.5-4mm and L6-9mm as the carrier. Under the condition of 85-90℃, the activated carbon is impregnated in 8 to 24 hours in the mercuric chloride aqueous solution, absorb mercuric chloride by physical adsorption, and then dry it so that the water content in the activated carbon is less than 0.3%, and the mercuric chloride catalyst containing 10.5 to 12.5% ​​mercuric chloride is prepared. This catalyst has the following disadvantages: 1. High mercury c...

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Problems solved by technology

[0002] At present, domestic enterprises use hydrogen chloride gas and acetylene gas to carry out addition reaction to synthesize vinyl chloride. Most of the catalysts used are columnar activated carbon with a diameter of 3.5-4mm and L6-9mm as the carrier. Under the condition of 85-90℃, the activated carbon is impregnated in 8 to 24 hours in the mercuric chloride aqueous solution, absorb mercuric chloride by physical adsorption, and then dry it so that the water content in the activated carbon is less than 0.3%, and the mercuric chloride catalyst containing 10.5 to 12.5% ​​mercuric chloride is prepared. This catalyst has the following disadvantages: 1. High mercury content, resource consumption; 2. Poor thermal stability, fast sublimation loss, fast decay of catalytic ability, generally producing 1 ton of vinyl chloride will consume 1.4-1.7Kg of mercuric chloride Catalyst, and in the reactor of 2.5 tons system, the total catalytic time of the two reactors before and after is only 7000 hours; 3. Due to the rapid loss of mercury sublimation and high consumption during production, some mercury elements enter the air with the reaction gas to pollute the environment and Entering the product and causing serious harm to the product