Method and system for continuously preparing 5-hydroxymethylfurfural and derivative thereof

Abstract

The invention relates to a method and a system for continuously preparing 5-hydroxymethylfurfural (5-HMF) and a derivative 5-alkoxymethylfurfural (5-AMF) thereof with hexose or hexose-containing biomass as a material. The method takes the characteristic of thermal instability in a target product into full consideration and utilizes the characteristic of distinct polarity difference between the product and the material, a reaction unit and an extraction unit are separated in the process of preparing the 5-HMF and the 5-AMF, the biomass material reacts along with a polar reaction phase under high temperature and existence of a catalyst, the produced product flows out of reaction environment in time, and after being cooled, the product is extracted and retained by a non-polar extraction phase under normal temperature and pressure. The insufficiently reacting material or a polar intermediate product is retained in the polar reaction phase, and enters the reaction unit again to form circulation until the reaction is sufficient. In order to increase the distribution ratio and extraction efficiency of the product, a certain amount of inorganic salt can be added into a polar solvent. The method and the device effectively increase the selectivity and yield of the target product, and remarkably reduce the energy consumption of the whole preparation process. Material resources applicable to the method and the system are wide, including soluble monosaccharide, insoluble lignocellulose and the like. Pickiness about catalysts is avoided, and homogenous and heterogeneous catalysts which are commonly used in such reaction are all applicable to the method and the system.

Description

technical field [0001] The invention relates to the fields of chemistry and chemical industry, in particular to a continuous preparation of platform compound 5-hydroxymethylfurfural (5-HMF) and its derivative 5-alkoxymethanol using hexose or biomass containing hexose as raw material A method and apparatus for furfural (5-AMF). Background technique [0002] 5-Hydroxymethylfurfural (5-HMF) is an important biomass-based platform compound, which can replace the current petrochemical raw materials for the preparation of high-quality fuel oil, polymer monomers, pharmaceutical intermediates, etc. It has important application potential in production. 5-HMF can be produced from hexose or carbohydrates containing hexose through hydrolysis, isomerization, dehydration and other reactions. Carbohydrates containing hexose sugars, such as cellulose, inulin, starch, etc., are widely found in nature, and the annual renewable amount is huge. 5-HMF and low-carbon alcohols, such as methanol,...

AI Technical Summary

Problems solved by technology

[0004] There are active structures such as aldehyde groups, cyclic ethers, and dienes in the molecular structure of 5-HMF and alkoxymethylfurfural, which are aromatic, and can undergo hydration and polymerization at high temperatures or in the presence of catalysts (such as acids, alkalis, etc.) Side reactions such as levulinic acid and humins (humins) are generated, which seriously affects the high yield generation of the target product

In summary, there is also a lack of 5-hydroxymethylfurfural (5-HMF) and derivative 5-alkoxymethylfurfural (5-alkoxymethylfurfural) and its derivatives 5-hydroxymethylfurfural (5-HMF) that can be continuous, low-cost, and have commercial application prospects. AMF) preparation technology

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