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在间歇式高温高压反应釜中,以Cu/Zn/Al金属氧化物为催化剂,对木质素在超临界甲醇中液化的影响因素进行研究,并对其液化反应动力学进行分析.结果表明,在反应温度340℃,反应时间3 h,催化剂添加量30 mg,料液比(木质素质量与甲醇体积比)为20∶1时,木质素液化转化率可达94.26%.采用一级化学反应动力学模型进行分析,木质素在超临界甲醇中液化反应的表观活化能为55.217 k J/mol,频率因子为50 513.7 s-1,反应动力学模型方程为dαdt=50 513.7e-55.217RT(1-α).
The influencing factors on the liquefaction of lignin in supercritical methanol were studied by using Cu / Zn / Al metal oxide as catalyst in batch-type high-temperature and high-pressure reactor, and the liquefaction kinetics was analyzed. Reaction temperature 340 ℃, reaction time 3 h, catalyst dosage 30 mg, liquid-to-liquid ratio (lignin mass to methanol volume ratio) of 20:1, the lignin liquefaction conversion rate can reach 94.26% .The first-order chemical reaction kinetics The apparent activation energy of lignin liquefaction reaction in supercritical methanol was 55.217 kJ / mol and the frequency factor was 50 513.7 s-1. The reaction kinetic model equation was dαdt = 50 513.7e-55.217RT ( 1-α).