Method for preparing cyclopentanone through furfural water liquid hydrogenation rearrangement

Abstract

The invention discloses a method for preparing cyclopentanone through furfural water liquid hydrogenation rearrangement. According to the method, the cyclopentanone is prepared by catalyzing one-step hydrogenation rearrangement of the furfural water liquid by loading Ru and Cu bimetals doped on the MCM-41 through TiO2 doping, the highest selectivity of the cyclopentanone reaches 98.79%, the corresponding furfural conversion rate is 99.75%, namely, the yield is as high as 98.54%, meanwhile, the mass fraction of furfural in the furfural water liquid to be reacted can be remarkably improved and reaches 10-15%, and the method is suitable for industrial production. Therefore, enrichment and batch treatment of reaction products are facilitated. The method has the advantages of short process route, simple reaction equipment and operation method, mild reaction conditions, short reaction time, simple and easily available catalyst, low cost, good stability, pure product, easy separation and purification, reduction of the content of precious metals, effective increase of the mass fraction of the reactant furfural, and realization of industrial production. The expected economic benefit is very considerable, and the method has great significance in application of industrial production.

Description

technical field [0001] The invention relates to the preparation of cyclopentanone, in particular to a method for preparing cyclopentanone by furfural aqueous liquid hydrogenation rearrangement. Background technique [0002] The energy crisis has been continuously sounding the alarm for human development. The efficient use of renewable biomass resources can effectively make up for energy shortages, reduce human dependence on fossil energy, and indirectly reduce the pollution of fossil energy. It has an important sustainable The scientific significance and application prospects of sexual development have attracted the attention of scientific and technological workers around the world in recent years. As a new type of biomass energy, furfural widely exists in agricultural and forestry wastes such as corncobs, bagasse, and cottonseed hulls. In recent years, the annual output of furfural in my country has exceeded 300,000 tons, accounting for more than 80% of the world's total pr...

AI Technical Summary

Problems solved by technology

However, the hydrogenation conversion of furfural to cyclopentanone requires the participation of a highly active hydrogenation catalyst and the participation of protons in an aqueous environment. The process is difficult to realize. Due to the harsh conditions and complex reactions, this process has not yet been industrialized, and further research is needed. Exploration and Development

[0006] In 2011, Xu Jie from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences [CN 103159606A] explored the use of various metal catalysts loaded on different supports for the hydrogenation of 15% furfural aqueous solution, and found that Ru-Ce / SiO 2 The catalytic performance is the best, the conversion rate is as high as 97%, the selectivity of cyclopentanone can reach 74%, and the yield is only 72%. The catalyst is used for low-concentration furfural aqueous solution, and the yield can only reach 72% under the best conditions, the product purity is not ideal, and the catalyst cost is high; in 2013, Xiao Guomin [CN103111299A] of Southeast University invented activated carbon and carbon nanotube loading Catalysts composed of Ni, Cu, Co, Mg and other metals treat 20% furfural aqueous liquid hydrogenation, and the yield of cyclopentanone is as high as 92% under the best conditions, but the amount of catalyst used is large and the cost of catalyst is high; Chinese Academy of Sciences Guangzhou Energy Zhang Qi [CN 201210371531A] of the research institute also used a pure metal catalyst for furfural aqueous solution with a concentration of 5%, and the generated product contained cyclopentanone and cyclopentanol, and the total yield of the two was only 52%. The effect is not good and the product is difficult to separate; in 2014, Wei Ruiping [CN 104069886A] of Southeast University used a 15% Pt-10% Co / HY type catalyst to treat 20% furfural aqueous solution, and the yield was as high as 96%, and proposed a porous Y type The unique pores of molecular sieves are not easy to deposit carbon, but the proportion of precious metals is as high as 15%, and the catalyst is expensive; there are many similar recent patent reports, and the main research contents are listed in Table 1

There are many similar reports, focusing on the catalyst composition of this system, the regulation of active components, the influence of additives, the influence of solvent, the influence of temperature and pressure, etc., but there is no ideal catalyst that can be used for furfural addition. Hydrogen rearrangement to cyclopentanone

Images