Catalyst containing rare-earth metal for preparing vinyl acetate using acetylene method and preparation method and use thereof

Abstract

The invention belongs to the field of vinyl acetate synthesized by a fixed bed type acetylene gas phase method, in particular to a catalyst for preparing vinyl acetate by a rare earth metal-bearing acetylene method as well as a preparation method thereof, and the rare earth metal-bearing catalyst is applied to the synthesis of vinyl acetate which takes acetic acid and acetylene as raw materials by adopting the fixed bed type gas phase method. The zinc acetate and lanthanum acetate are dissolved with methanol, then active carbon is dipped in the methanol solution containing the zinc acetate and lanthanum acetate under agitation, the zinc acetate and lanthanum acetate are loaded on the active carbon through an impregnation method, and the catalyst is obtained after drying. The content of the loaded active component zinc acetate is 10 to 40wt% of the total weight of catalyst, and the content of the loaded active component lanthanum acetate is 0.1 to 5wt% of the total weight of catalyst. The catalyst takes the active carbon as a carrier, and adopts two metallic salts of the loaded zinc acetate and the lanthanum acetate, and the catalyst containing lanthanum acetate has the advantage of low initial temperature of reaction compared with the usual active carbon zinc acetate catalyst.

Description

technical field [0001] The invention belongs to the field of fixed-bed acetylene gas-phase synthesis of vinyl acetate, in particular to a catalyst for the preparation of vinyl acetate by the acetylene method containing rare earth metals and a preparation method thereof, and the application of the catalyst containing rare earth metals to acetic acid and acetylene as raw materials. Vapor phase synthesis of vinyl acetate. Background technique [0002] Vinyl acetate is one of the most widely used organic chemical raw materials and one of the most important downstream products of acetic acid. It is mainly used in the production of polyvinyl acetate, polyvinyl alcohol and copolymers with ethylene, vinyl chloride and acrylonitrile. These products are It is widely used in the production fields of coatings, dyes, adhesives, chemical fibers, films and various resins. With the development of science and technology, new application areas are still expanding. [0003] In 1922, Muqaen o...

AI Technical Summary

Problems solved by technology

[0004] The catalyst used in the synthesis of vinyl acetate by acetylene vapor phase method is Zn(CH 3 COO) 2 / C, an important disadvantage of this catalyst is that the production capacity is not high

In order to improve the production capacity of the catalyst, scholars at home and abroad have done a lot of research work, mainly focusing on the research and development of catalyst active components with high activity, such as Japanese scholars (Saburo Miyazawa "Journal of Industrial Chemistry". V 61.NO614 ( 1958)) proposed a two-component oxide (V 2 o s -ZnO and Fe 2 o 3 ) or three-component oxide (16 ZnO·32 Fe 2 o 3 ·V 2 o 3 ) as the active component of the catalyst, although at 250 °C has a higher 3 COO) 2 The production capacity of / C catalyst, but it has not been industrialized due to high reaction temperature, high cost, and rapid decline in activity, etc.

Domestic Jilin Chemical Fiber Research Institute has conducted research on ZnO-ZnCl 2 The / C catalyst has been studied and achieved good pilot test results, but due to the environmental pollution and ZnCl in the preparation process of the catalyst 2 Corrosion to equipment limits the promotion of this catalyst

Chen Shu et al on the loading of active components on Zn(CH 3 COO) 2 The influence of the / C catalyst on the production capacity has been studied, but the influence of the structure and properties of activated carbon on the performance of the catalyst has been studied less

[0005] At present, the disadvantages of activated carbon / zinc acetate catalysts are mainly related to the reaction temperature. For example, when the reaction temperature is high, the zinc acetate supported on the surface of the activated carbon sublimates, resulting in a reduction in the activity of the catalyst. The phenomenon of catalyst deactivation caused by sublimation loss becomes more and more obvious

In addition, when the reaction temperature is high, the thermal decomposition reaction of zinc acetate will occur, resulting in carbon deposition on the surface of the catalyst, which will affect the catalyst activity and the service life of the catalyst.