Abstract
In this paper, a two-phase system, formed by oxalic acid/choline chloride-based deep eutectic solvent (DES) and chosen extractants, was used as a dissolution–reaction–separation system, and metal chloride was used as a catalyst to study the degradation of cellulose to produce 5-hydroxymethylfurfural (5-HMF) and glucose. The effects of the amount of organic solvent and the reaction temperature on product yield, the repeated recycling of DES, the comparison between a two-phase system and a homogeneous system, and the mechanism of cellulose degradation to 5-HMF were investigated. The results show that ethyl n-butyrate has the best extraction effect on 5-HMF. Compared with the homogeneous system, the yield of 5-HMF and glucose in the two-phase system is significantly improved. At a temperature of 140 °C and a reaction time of 120 min, the yields of glucose and 5-HMF reached the maximum, which were 23.5% and 29.8%, respectively. After DES was reused three times, the yields of glucose and 5-HMF decreased greatly, indicating that the recycling rate of DES was low.
Highlights
College of Marine Science and Biological Engineering, Qingdao University of Science & Technology, Guangxi Key Laboratory of Polysaccharide Materials and Modification, School of Chemistry and Chemical
A small amount of 5-HMF was added to an equal amount of deep eutectic solvent (DES), and a sufficient amount of tetrahydrofuran (THF), ethyl butyrate, methyl isobutyl ketone (MIBK), ethyl acetate, and toluene were added, shocked it until fully dissolved, left to stand and the clock was started
Due the to the addition of a large number of organic boiling point,that which affects the experimental results, temperature is decreased, and if we reduce solvents, and considering that the organic will evaporate to carry part of 5-HMF after the temperature, cellulose dissolution is slow solvents and the product yield is delayed
Summary
College of Marine Science and Biological Engineering, Qingdao University of Science & Technology, Guangxi Key Laboratory of Polysaccharide Materials and Modification, School of Chemistry and Chemical. The effects of the amount of organic solvent and the reaction temperature on product yield, the repeated recycling of DES, the comparison between a two-phase system and a homogeneous system, and the mechanism of cellulose degradation to 5-HMF were investigated. 5-HMF is a very important new type of platform compound [1]. It contains a variety of functional groups, and has good reactivity. It is widely used in the manufacture of polymer materials [2], fine chemicals [3], biofuel processing [4,5,6], and other fields
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
