超临界甲醇中木质素催化液化研究

CATALYTIC LIQUEFACTION RESEARCH OF LIGNIN IN SUPERCRITICAL METHANOL

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。

Direct liquefaction of lignin under the condition of supercritical methanol using Cu/Zn/Al oxides as catalysts was carried out in a pressurized batch reactor. The effects of liquefaction temperature, liquefaction time, ratio of lignin to methanol, and dosage of catalyst on the lignin conversion are investigated. The experimental results from orthogonal matrix showed that the optimum liquefaction conditions were reaction temperature of 340℃, liquefaction time of 3 h, lignin methanol ratio of 20：1 （mg/mL） , and the catalyst dosage of 37.5%, which results in an overall conversion of 94.26% for lignin. The analysis with FT-IR and GC-MS indicated that the liquefaction product is a complex mixture with ethers, esters, phenols and alcohols as the main ingredients.