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研究了水解木质素在高压釜中的间歇催化液化。通过分析产物的分布、碳氢含量和碳基的转化率及收率,证明氢氧化钠是水解木质素在超临界乙醇溶液中液化的高效催化剂,当氢氧化钠催化剂含量为0.06g/mL时,原料碳基转化率可高达93.53%,总油分碳基收率则高达94.96%。同时,实验表明氢氧化钠催化剂的催化效果要优于氢氧化钠/硫化钠复合催化剂的催化液化效果,硫化钠的加入无助于水解木质素在超临界乙醇溶液中的液化。结果的分析显示水解木质素在超临界乙醇溶液中的液化过程非常复杂,包括水解木质素单元的降解反应脱氧反应和木质素单元的支链脱落等过程。
The batch catalytic liquefaction of hydrolyzed lignin in an autoclave was investigated. By analyzing the product distribution, hydrocarbon content and carbon-based conversion rate and yield, sodium hydroxide is proved to be an efficient catalyst for liquefaction of hydrolyzed lignin in supercritical ethanol solution. When the content of sodium hydroxide catalyst is 0.06g / mL , The carbon conversion of raw materials can be as high as 93.53%, the total yield of carbon-based oil as high as 94.96%. At the same time, experiments show that the catalytic effect of sodium hydroxide catalyst is superior to the catalytic liquefaction effect of sodium hydroxide / sodium sulfide composite catalyst, and the addition of sodium sulfide does not help liquefaction of hydrolyzed lignin in supercritical ethanol solution. The analysis of the results shows that the liquefaction process of hydrolyzed lignin in supercritical ethanol solution is very complicated, including the process of deoxygenation of degradation reaction of lignin units and the branching off of lignin units.