Method for preparing GBL (Gamma-Butyrolactone) by taking furfural as raw material

Abstract

The invention discloses a method for preparing GBL (Gamma-Butyrolactone) by taking furfural as a raw material. The method comprises two steps of oxidizing the furfural to prepare 2(5H)-furanone and hydrogenating the 2(5H)-furanone to prepare the GBL, wherein the 2(5H)-furanone can be synthesized by the furfural by taking homogeneous-phase acid or solid acid as a catalyst and taking hydrogen peroxide as an oxidant under the conditions of mild temperature and pressure. The 2(5H)-furanone is further selectively hydrogenated to obtain the GBL under the effect of a metal catalyst in a hydrogen atmosphere. The GBL can be generated by commonly hydrogenating the 2(5H)-furanone serving as a main product and C4 binary acid serving as a byproduct of the oxidation of the furfural in situ under appropriate conditions. According to the method, high-efficiency conversion from the furfural serving as a biomass raw material to the GBL serving as a fine chemical product is realized; the method has a great application prospect.

Description

technical field [0001] The invention relates to a new method for preparing gamma-butyrolactone, more specifically a new route for preparing gamma-butyrolactone by using furfural as a raw material through catalytic oxidation and catalytic hydrogenation in series. Background technique [0002] γ-butyrolactone, also known as 1,4-butyrolactone, is an important organic intermediate that is widely used in the synthesis of fine chemicals, medicine, pesticides, spices and other fields. It is the raw material for the synthesis of fine chemicals such as α-pyrrolidone, N-methylpyrrolidone, vinylpyrrolidone, acetylbutyrolactone, and cyclopropylamine, and the intermediate for the synthesis of vitamin B1, ciprofloxacin, and other drugs. It is used in the synthesis of chlorophenoxybutyric acid herbicides, herbicides and insecticides. γ-butyrolactone is also a high-boiling point, strong solubility, good conductivity, non-toxic and safe proton-type strong solvent, which can be used as resin...

AI Technical Summary

Problems solved by technology

But unfortunately, most furfural conversion researches are still in the stage of organic synthesis in the laboratory, and the downstream products of furfural in industry are mainly traditional chemical products such as furfuryl alcohol, tetrahydrofurfuryl alcohol, furfur resin, furan, etc., which leads to excess production capacity of furfural, An important reason for the low profit of the industry

[0008] Some studies have reported organic experiments on the oxidation of furfural to 2(5H)-furanone, but there are problems such as slow reaction rate, low selectivity, and difficult separation of main and by-products, and the application of 2(5H)-furanone is limited, mainly Involved in organic synthesis, but has not yet developed a scalable downstream product

[0009] On the one hand, the traditional γ-butyrolactone synthesis process is complex and highly dependent on petrochemical raw materials; on the other hand, furfural has excess production capacity and single downstream products

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