A method for preparing furan compounds and liquid naphthenes by full utilization of primary biomass

Abstract

In a two-phase system of an organic phase and an aqueous phase, an inorganic neutral halogen salt serves as a catalyst, so that high-efficiency conversion from primary biomass to 5-hydroxymethylfurfural (HMF) and furfural can be realized. An aqueous solution containing the inorganic neutral halogen salt can be recycled after the reaction is ended; the upper organic phase is subjected to alkali treatment, so that a relatively pure organic solution containing the 5-hydroxymethylfurfural (HMF) and furfural and xylogen residues can be obtained; the obtained xylogen residues are further hydrogenated under the action of a noble metal or transition metal multifunctional catalyst so as to obtain the liquid naphthenes. The method disclosed by the invention has the advantages that usage of an acid catalyst is not involved in the dehydration reaction process, and the produced 5-hydroxymethylfurfural and furfural can be efficiently extracted into the upper organic phase after the reaction is ended; after the organic phase is washed with alkali liquor, the xylogen residues are obtained by acid neutralization, the liquid naphthenes are prepared by one-step hydrogenation, and the method is simple in operation, realizes total conversion of the primary biomass and has excellent industrial application prospects.

Description

technical field [0001] The invention relates to a method for preparing furan compounds and liquid naphthenes starting from the full utilization of primary biomass, and belongs to the field of the preparation of renewable chemicals synthesized from biomass. More specifically, it relates to a method for preparing 5-hydroxymethylfurfural, furfural and liquid naphthenes from raw biomass. Background technique [0002] With the rapid growth of the world economy, fossil fuel (especially oil) resources are becoming increasingly scarce, and their use has brought a series of social and environmental problems to human society. , low pollution and sustainable development, therefore, the research on synthetic fuels and fine chemicals from biomass and its derivatives, one of the renewable energy sources, has attracted widespread attention at home and abroad. [0003] Biomass, especially lignocellulose, is composed of three parts, including cellulose, hemicellulose and lignin, and their c...

AI Technical Summary

Problems solved by technology

In the above reaction, the inorganic metal salt plays the role of isomerizing glucose to fructose, but the catalyst and the product are difficult to separate, and the inorganic acid of the catalyst severely corrodes the reaction equipment and pollutes the environment, so it is difficult to avoid the disadvantages of the introduction of the inorganic acid

Moreover, the current production cost of ionic liquids is too high and does not have the advantage of low cost, thus limiting its further industrial application.

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