Solid acid catalysis and supercritical extraction coupled furfural preparation and apparatus

Abstract

The invention discloses a solid-acid catalysis and supercritical extraction coupling preparation method of furfural and a device thereof, pertaining to the technical field of the preparation of biobased chemicals. The method adopts solid acid as a catalyst, such as superacid or molecular sieve, and uses supercritical CO2 (SCCO2) for on-line extraction and separation of products. In the whole preparation process of the furfural, raw material aqueous phase and supercritical fluid phase successively enter a tower for realizing the countercurrent contact multiple-extraction which is carried out in a catalysis filling extracting tower. In the whole process, the solid acid is easily separated from the product, can be recycled and has little corrosion to equipment. Discharge amount of the three wastes is small and operation is convenient and safe. Furthermore, the SCCO2 has low cost, no toxicity, good diffusivity performance and easily controllable solubility, and such a defect as mass transmission efficiency reduction in a heterogeneous catalytic reaction after the use of the solid acid can be overcome when the SCCO2 is used for on-line extraction of the furfural, so as to immediately remove coking precursors from a catalyst pore passage, thereby deferring the inactivation of the catalyst, realizing green and clean production technology and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of bio-based chemicals, and in particular relates to a furfural preparation method and device coupled with solid acid catalysis and supercritical extraction through catalytic dehydration and cyclization of xylose. Background technique [0002] Petroleum and other fossil resources have limited reserves and are non-renewable. In recent years, the price of crude oil has soared and environmental pollution has intensified, making it urgent for people to find new alternative resources. Biomass has the advantages of renewable, no net greenhouse gas emissions, and pollution-free use. Therefore, the preparation of chemicals, polymer materials, and bioenergy fuels using biomass as an alternative raw material for fossil resources has become a research hotspot. In the preparation of bioenergy fuels, biomass raw materials are generally made into platform compounds, and then many other chemicals are produce...

AI Technical Summary

Problems solved by technology

It is characterized in that, the furfural preparation method of described solid acid catalysis and supercritical extraction coupling is to use solid acid such as superacid or molecular sieve as catalyst, adopts supercritical carbon dioxide (SCCO 2 ) on-line extraction and separation of products, the entire furfural preparation process is carried out in a catalytic packing extraction tower, the solid acid is easy to separate from the product during the whole process, can be recycled, the equipment is less corrosive, the three wastes are less discharged, and the operation is convenient and safe, while SCCO 2 Inexpensive, non-toxic, excellent diffusion performance, easy to control solubility, SCCO 2 On-line extraction of furfural can also overcome the decrease in mass transfer efficiency in heterogeneous catalytic reactions after the use of solid acids, and immediately remove the coking precursors produced in the catalyst pores, thereby delaying the deactivation of the catalyst

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