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以Cu/Zn/Al氧化物为催化剂,利用间歇式高温高压反应釜,超临界甲醇为液化介质,进行木质素液化研究。分别考察液化温度、液化时间、料液比(木质素质量与甲醇体积之比)和催化剂添加量对木质素转化率的影响。试验结果表明,木质素高效液化条件为:液化温度340℃,液化时间3 h,料液20∶1(mg/m L),催化剂添加量为木质素质量37.5%,转化率达到94.26%。通过FT-IR、GC-MS对木质素液化产物组分检测分析表明,其组分复杂,主要成分为醚类、酯类、酚类、醇类。
A Cu / Zn / Al oxide catalyst was used to study the liquefaction of lignin using a batch high temperature and high pressure reactor with supercritical methanol as the liquefaction medium. The influence of liquefaction temperature, liquefaction time, ratio of solid to liquid (ratio of lignin mass to methanol volume) and amount of catalyst on lignin conversion were investigated. The results showed that the lignin efficient liquefaction conditions were: liquefaction temperature 340 ℃, liquefaction time 3 h, feed solution 20:1 (mg / m L), dosage of catalyst was lignin 37.5% and conversion rate 94.26%. By FT-IR, GC-MS analysis of components of lignin liquefaction products showed that the composition is complex, the main components of ethers, esters, phenols, alcohols.