Method for pretreating and converting biomass into 5-hydroxymethyl furfural

Abstract

The invention discloses a method for pretreating and converting biomass into 5-hydroxymethyl furfural, and belongs to the field of biomass utilization. The method comprises the following steps: uniformly mixing biomass and imidazolium ionic liquids in proportion, applying ultrasonic waves with different frequencies at certain temperature, stirring for a certain time with magnetic force, obtaining regenerative biomass after water filtering and drying, taking ionic liquid as a solvent and solid acid as a catalyst, mixing the biomass, the catalyst and the solvent according to certain mass ratio, performing microwave heating, computing a yield, and finally recycling the solid acid and the ionic liquid. Considering the aspects of biomass pretreatment and converting the biomass into 5-HMF, the method adopts ultrasonic-ionic liquid pretreatment and microwave-solid acid / ionic liquid system to catalyze the biomass into 5-HMF, greatly improves the yield of 5-HMF, has the characteristics of high efficiency, low pollution and low energy consumption, meanwhile realizes the purpose of green recycling, and belongs to a novel method for converting the biomass into 5-HMF.

Description

technical field [0001] The invention belongs to the field of biomass utilization, and relates to a method for promoting microwave-solid acid / ionic liquid system conversion of biomass into 5-hydroxymethylfurfural (5-HMF) by using ultrasonic-ionic liquid pretreatment Background technique [0002] Petrochemical resources are depleting day by day, environmental pollution is becoming more and more serious, and the development of clean and renewable resources has become the theme of the world today. Lignocellulosic biomass resource is a kind of renewable resource, which is abundant in nature, but it is seriously discarded, and its complex fiber structure makes it difficult to degrade. How to effectively utilize biomass resources has become a key issue. [0003] Traditional pretreatment methods have disadvantages such as high cost, serious pollution, and huge energy consumption. As new pretreatment methods, ionic liquid and ultrasonic technology have received widespread attention, ...

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Problems solved by technology

[0015] Among the above-mentioned patents, patents (1)-(3) and (6)-(8) use acid methods to treat biomass in the pretreatment or hydrolysis biological process. This method will cause serious corrosion of equipment and there is still a safety hazard. Low reactivity and unrecoverable defects; the reaction conditions in patents (4), (5) and (6) to (10) require high temperature, the energy consumption demand is large, and the equipment requirements are also high; the patent (9) uses Catalysts of metal salts, after use, metal salts are likely to lead to residual heavy metal pollution of the product, and it takes a long time, the yield is low, and the energy consumption increases; the heating methods used in all the above patents are commonly used air heat transfer This heating method has disadvantages such as poor penetration, slow heat transfer, uneven heating of substances, etc.

[0016] At present, the combination of physical method, chemical method, biological method and physical chemistry method used for pretreatment of biomass has more or less disadvantages of high energy consumption, low efficiency, serious pollution, difficult recycling and high requirements for equipment, and it is difficult to carry out large-scale Applied to production, and in recent years, the use of ionic liquid and ultrasonic waves to pretreat biomass alone to improve its degradation rate, although it can play a certain effect, the overall utilization rate of biomass is still not high

In the conversion of biomass to 5-HMF, the above problems also exist, and the purpose of efficient utilization has not been achieved in terms of conversion rate.

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