Method for synthesizing and regenerating mercury-free catalyst for hydrochlorination of acetylene and application thereof

Abstract

The invention relates to a method for synthesizing and regenerating a mercury-free catalyst for hydrochlorination of acetylene and an application thereof, which belongs to the technical field of preparation of the mercury-free catalysts. The catalyst contains bismuth, phosphorous, a component for promoting catalysis and a carrier. The content of bismuth element accounts for 0.1-68.8wt% of the weight of the catalyst, the content of phosphorous element accounts for 0.1-40.8wt% of the weight of the catalyst, the content of the component for promoting the catalysis accounts for 0.1-63.6wt%, and the content of the carrier accounts for 50-99.5%. The coke-burning regeneration is carried out on the catalyst in hydrogen, water vapor, oxygen, air or other oxygen-containing oxidative atmosphere at the temperature of 300-600 DEG C after the inactivation. The catalyst is prepared by the impregnation method, the co-precipitation method or the spray granulation method. The catalyst provided by the invention has the advantages of good activity, high selectivity, high strength and regeneration, and can be used for producing vinyl chloride by the hydrochlorination of the acetylene.

Description

technical field [0001] The invention belongs to the catalyst preparation technology and application range, in particular to a hydrochlorination catalyst and its application, specifically, to a catalyst for producing vinyl chloride from acetylene and hydrogen chloride and its preparation and regeneration method. Background technique [0002] Polyvinyl chloride is one of the most widely used general-purpose plastics in the world due to its excellent performance in many aspects such as physical properties and chemical stability. Polyvinyl chloride is polymerized from vinyl chloride (VCM). The industrial preparation methods of vinyl chloride monomer are mainly acetylene carbide method and ethylene oxychlorination method. The acetylene calcium carbide method is more suitable for production in countries and regions with rich coal resources and shortage of oil resources because the raw material is coal. Since 2000, my country's PVC production capacity has increased by an average o...

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Problems solved by technology

In addition, the strength of activated carbon is also low, which makes it not suitable for large-scale fluidized bed production, but only small fixed bed production

[0006] Because acetylene hydrochlorination has great economic and energy advantages over ethylene oxychlorination, the world has been developing catalysts that can replace mercury chloride catalysts, and developed countries are even trying to use platinum, gold, etc. Noble metal catalysts are used to replace mercuric chloride catalysts, but the effect is still unsatisfactory

British Graham J.Hutchings et al. used HAuCl 4 As an active component, activated carbon is used as a carrier to prepare a catalyst with high activity, but the cost of the catalyst is very high, and the catalyst is deactivated, and the deactivated catalyst is not easy to regenerate

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