原料粒径及研磨预处理对秸秆液化产物的影响研究

摘要

Influences of grain size and grind on conversion rate and yield of ethyl levulinate were analyzed,and the influence of the grain size of the raw material on the liquefied intermediate product was also studied.The reaction condition was catalyst of 10％,temperature of 190 ℃C,reaction time of 60 min,solid-to-liquid ratio of 1 ∶ 15,took the wheat straw as raw material and the autoclave as reaction device.Finally,the liquefaction products obtained were analyzed,and the effects of different grain sizes and grinding time on the liquefaction effect were examined.The results showed that top yield of EL was 20.53％ at 40-60 mesh,and the conversion was 69.67％.Under the different grind time,the maximum of conversion was 72.33％ at 11 h,the yield of EL increased slightly with increasing of milling time.Under the optimum conditions,the proportion of ethyl levulinate in the liquefied product was 53.86％.%主要研究原料粒径及研磨预处理对液化转化率和乙酰丙酸乙酯(ethyl levulinate,EL)得率的影响,同时还研究了原料粒径对液化中间产物的影响,在催化剂用量为10％,反应温度为200℃,反应时间为60 min,固液比为1∶15的条件下,以小麦秸秆为原料在高压釜中密封液化,最后对所得液化产物进行分析,考察不同粒径和研磨时间对液化效果的影响.结果表明:不同粒径大小下,40～60目时的乙酰丙酸乙酯的得率最高,可达20.53％,此时的转化率为69.67％;不同研磨时间下,llh时的液化率最高为72.33％.而乙酰丙酸乙酯的得率随研磨时间的增加略有升高;最佳条件下,乙酰丙酸乙酯在液化产物中所占的比例为53.86％.