离子液体催化亚临界水液化与超临界水气化碱木质素的协同机理研究

水热法处理造纸黑液是生物质能利用领域的研究热点，而提高黑液中碱木质素的转化效率是难点。研究表明，利用亚临界水液化和超临界水气化两步处理法，可以有效提高生物质水热转化效率。据此，本项目拟制备并筛选出一种功能化离子液体，作为亚临界水液化反应的“绿色”催化剂和溶剂，实现液化反应的强化；然后，通过对液化产物的定性和定量分析，研究离子液体催化亚临界水液化碱木质素的反应机理，实现反应选择性的定向调控以促进后续气化反应；再以液化产物在超临界水中的气化规律为基础，协同调控液化和气化参数，重点研究亚临界水液化与超临界水气化参数的最优匹配原则，最终总结出两步反应间的协同机理。该项目的实施有望为碱木质素的低温高效气化提供理论依据和新的突破点，从而推动造纸黑液的无害化与资源化利用进程。

Recently, studies on hydrothermal conversion of black liquor have become a research hotspot in the field of biomass energy utilization, but improving the gasification efficiency of black liquor alkali lignin is difficult. Researches show that hydrothermal conversion efficiency of biomass can be improved, when combining subcritical water liquefaction and supercritical water gasification process. Based on this, this project will screen a kind of ionic liquids, as a "green" catalyst and solvent in subcritical water liquefaction reaction, which will enhance subcritical water liquefaction reaction. Then, qualitative and quantitative analysis of liquefied products will be conducted to study the mechanism of subcritical water liquefaction reaction of alkali lignin catalyzed by ionic liquids, and the directional regulation of liquefaction reaction selectivity will be realized to promote subsequent gasification reaction. And based on gasification law of liquefied products in supercritical water, liquefaction and gasification reaction parameters will be coordinately controlled to obtain the optimal matching parameters between the two step reactions. At last, coordinated mechanisms between subcritical water liquefaction and supercritical water gasification will be revealed to promote gasification of alkali lignin. The project is expected to provide a new breakthrough and theoretical basis for efficient gasification of alkali lignin in relatively low temperature, in order to push forward on harmlessness and resource utilization of black liquor.