微波辐射-亚临界CO2调变催化纤维素制乙酰丙酸机理研究

项目名称： 微波辐射-亚临界CO2调变催化纤维素制乙酰丙酸机理研究

项目编号： No.21206162

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 化学工程及工业化学

项目作者： 章青

作者单位： 安徽师范大学

项目金额： 25万元

中文摘要： 针对纤维素水相转化合成化学品乙酰丙酸中目标产物收率低、不稳定及难调控等技术瓶颈，提出微波辐射-亚临界CO2联用体系中纤维素定向转化与产物可控的构思。采用微波辐射技术对纤维素预处理改性，提高纤维素的可及性与反应活性，并通过CO2与H2O耦合形成碳酸的动力学研究，结合有机多元酸的调变特性，构建中间关键产物的CO2与有机酸调变控制耦合反应，取代传统盐酸、硫酸等无机酸或固体酸催化剂，研究纤维素在反应体系中水解-脱水-再水解的分子历程与作用机制，并建立相关动力学模型，揭示纤维素定向转化与产物可控规律，在此基础上，利用水气变换转化，实现CO2的体系内循环，获得纤维素水相定向绿色转化乙酰丙酸技术新突破，为纤维素类生物质绿色转化成化学品及高品位液体燃料等领域的规模化利用提供理论依据和技术支撑。

中文关键词： 葡萄糖；纤维素；乙酰丙酸；催化；亚临界CO2

英文摘要： A new strategy of levulinic acid production from direct conversion of cellulose was proposed by using a microwave radiation method associated with the subcritical CO2 system in this project so as to solve the difficult technical problems such as uncontrollable transformation of cellulose, low yield and instability of levulinic acid. Herein, cellulose feedstock was firstly pretreated by microwave radiation technology to improve the accessibility and reactivity in the aqueous phase, and then transformed into levulinic acid under the subcritical CO2 system, following by investigating the kinetics of carbonic acid formation according to the reaction between CO2 and H2O as well as the modulation of organic acid, and therefore exhibiting a promising substitute for the use of traditional hydrochloric acid, sulfuric acid, inorganic acid or solid acid catalyst in the transformation of cellulose by the adjustment of the key intermediates of the coupling reaction between CO2 and organic acids. Meanwhile, the molecular mechanism of cellulose conversion would be elucidated in the process of hydrolysis, dehydration and hydrolysis, and then the nature of adjusted cellulose conversion and controlled product would be revealed by the combination of the establishment of a related dynamic model. In addition, taking account of the w

英文关键词： Glucose；Cellulose；Levulinic acid；Catalysis；Subcritical CO2