Abstract

In this work, protic ionic liquid, 1-methylimidazolium hydrogen sulfate (HMIMHSO₄) and gamma-valerolactone (GVL) were explored with respect to their effects on levulinic acid production directly from cotton stalks and pine using the acidic catalyst, CrCl₃.6H₂O in a hydrothermal reactor. GVL as a biomass-derived solvent resulted in higher yields of levulinic acid compared to HMIMHSO₄ which was attributed to the higher lignin depolymerization capacity of the solvent and GVL’s capability for stabilization of the solvated protons. The increasing water content of the media from 10% to 20% enhanced the production and the yields. GVL gave the maximum levulinic acid concentration and yield from pine; 21.4 g/L and 78%, respectively when the reaction was conducted at 180 °C and 10% biomass loading with 20% water and 0.1 M CrCl₃.6H₂O for 4 h.

摘要

在这项工作中，质子型离子液体，1-甲基咪唑硫酸氢盐（HMIMHSO ₄）和γ-戊内酯（GVL）分别相对于它们的上乙酰丙酸直接从棉花秸秆生产和松效果使用酸性催化剂，探索的CrCl ₃ ·6H ₂ ○在水热反应器中。与HMIMHSO ₄相比，GVL作为生物质衍生的溶剂可提高乙酰丙酸的收率这归因于溶剂中较高的木质素解聚能力和GVL稳定溶剂化质子的能力。介质中的水分含量从10％增加到20％可以提高产量和产量。GVL给出了松树中最大的乙酰丙酸浓度和产量。当反应在180°C和10％生物量负载下，20％水和0.1 M CrCl ₃ .6H ₂ O进行4小时时，分别达到21.4 g / L和78％。