A kind of preparation method of mercury-free catalyst for the synthesis of vinyl chloride by acetylene method

Abstract

The invention discloses a method for preparing a mercury-free catalyst for the synthesis of vinyl chloride by acetylene method. In the method, the active components of the catalyst are highly dispersed and bonded to the surface of the carrier by carrying out surface modification treatment on the catalyst carrier and applying ultrasonic loading technology. On the group, a firm load is formed in the internal pores of the carrier, so that while improving its catalytic performance and stability, it can greatly reduce the loading of the required active components and reduce the cost of the catalyst. The method is especially suitable for preparing supported noble metal catalysts. The supported noble metal catalysts prepared by the method of the present invention can reach and exceed the catalytic activity of the currently used mercuric chloride catalysts in the case of a very small amount of loading. And stability, has industrial application value, and is of great significance in environmental protection and promoting the sustainable development of my country's polyvinyl chloride industry.

Description

technical field [0001] The invention relates to a method for preparing a mercury-free catalyst, in particular to a method for preparing a mercury-free catalyst used in the reaction of synthesizing vinyl chloride by acetylene method. Background technique [0002] Polyvinyl chloride (PVC) is one of the top five engineering plastics in the world. It is widely used in various industries. With the acceleration of social development, the application field of PVC has been expanded unprecedentedly. Vinyl chloride monomer is the raw material for polymerization into polyvinyl chloride. At present, the synthesis methods of vinyl chloride monomer mainly include ethane method, ethylene method and acetylene method. Although the ethylene method using petroleum as raw material is mostly used in foreign countries at present, with the depletion of petroleum resources and the continuous soaring of world crude oil prices, the acetylene method has once again received widespread attention. In o...

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Problems solved by technology

[0005] Non-noble metal catalysts undoubtedly have obvious advantages over noble metal catalysts in terms of cost. Researchers have also carried out a lot of research work in this field, and tried many transition metal elements and their combinations such as tin, bismuth, barium, potassium, iron, copper, Calcium, manganese, etc., or due to their chemical nature such as their electronic structure, their catalytic activity and service life, there is still a huge gap from the realization of industrialization

[0006] The excellent catalytic activity of noble metal catalysts in the synthesis of vinyl chloride by the acetylene method has been confirmed by many researchers, but its industrial application is seriously hindered due to its relatively expensive raw material cost compared with mercury catalysts

Most of the previous research on noble metal catalysts focused on the selection of additive elements, the selection of different types of supports, and the modulation of loading capacity, etc., and the preparation methods are generally simple equal-volume impregnation or multiple-volume impregnation. , modification is also limited to simple treatment such as pickling, so although the above research has made some progress, the catalyst involved requires a high content of precious metals, and the cost is still too expensive, so it is difficult to effectively solve the current problem of my country's PVC industry. Actual demand

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