Method of extracting 5-hydroxymethyl furfural from ionic liquid

Abstract

A method of extracting 5-hydroxymethyl furfural from an ionic liquid. In the method, an extraction additive is added to a two-phase extraction system composed of an extraction agent and the ionic liquid containing 5-HMF to achieve high-effective transfer of the 5-HMF from an ionic liquid phase to an extract phase, wherein the extraction additive and the ionic liquid cannot form a two-phase system since the extraction additive is mutually soluble with the ionic liquid, but the extraction additive can significantly increase the distribution ratio of the 5-HMF in the extract phase. For example, with methyl isobutyl ketone (MIBK) as the extraction agent for extracting the 5-HMF from [BMIM]Cl, under same comparison conditions, the concentration ratios of the 5-HMF in the MIBK and the [BMIM]Cl are respectively 5.76:100 and 8.87:100 with addition of the extraction additive being methanol or ethanol, and without the extraction additive, the concentration ratio is only 0.96:100. The method effectively improves the extraction effect of the 5-HMF from the ionic liquid, thereby reducing the use amount of the extract phase.

Description

Technical field [0001] The invention belongs to the technical field of chemical extraction, and specifically relates to a method for extracting 5-hydroxymethyl furfural from an ionic liquid. Background technique [0002] At present, petrochemical energy is increasingly depleted, and the development and utilization of bio-energy are favored. Among them, the more prominent research is the catalytic conversion of cellulose, glucose, fructose, etc. into 5-hydroxymethylfurfural (5-HMF or HMF). 5-HMF is an important platform compound that converts biomass into biomass fuel or chemicals. It can be synthesized from biomass raw materials in ionic liquids, water or organic solvents. Among them, in ionic liquids, cellulose and sugars can be efficiently converted into 5-HMF under the action of metal salt catalysts, which have the most economical raw material extraction and high conversion efficiency, and occupy an important position in biomass conversion. However, due to the strong binding ...

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Problems solved by technology

Yuriy Roman-Leshkov et al, Science312, 1933 (2006) added dimethyl sulfoxide (DMSO) to the aqueous phase reaction and used methyl isobutyl ketone / isobutanol (MIBK / 2-Butanol) as the extractant, Separation of 5-HMF from the aqueous reaction system, but no report on the separation of 5-HMF from ionic liquids

Annegret Stark et al, J.Chem.Eng.Data57, 2985 (2012) studied the performance of MIBK, methanol, ethanol and other organic solvents to extract HMF from ionic liquids, and found that MIBK and other organic solvents that are immiscible with ionic liquids can extract HMF from Extract 5-HMF from ionic liquids, while organic polar small molecules such as methanol and ethanol do not have the ability to extract 5-HMF from ionic liquids because they are miscible with ionic liquids

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