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在低温条件下将生物油的不稳定组分醛酮类等通过氧化酯化联立提质,制备获得以酯、醇、醚为主要成分的稳定含氧燃料。采用Amberlyst-36离子交换树脂为催化剂、H_2O_2为氧化剂,最优条件100℃,12.5%(质量分数)Amberlyst-36离子交换树脂和醇油质量比为1∶1,生物油的酸值从40.88 mg NaOH/g降至14.82 mg NaOH/g,水分含量从36.37%降至17.54%,热值由14.46 MJ/kg升至25.13 MJ/kg,粘度从18.49 mm~2/s降为7.04 mm~2/s,C元素含量从38.42%增至51.01%,O元素从52.75%减至39.86%。相比较于酯化提质,H_2O_2的存在使体系中不稳定的醛酮类进一步转化为稳定的目标产物,氧化酯化提质油中酯、醇、醚的相对含量为84.2%,比酯化提质油高19.6%,酸类、醛酮类的相对含量降至0.08%、5.12%,比酯化提质油分别少2.60%、4.23%,最后利用水和CH_2Cl_2对氧化酯化提质油萃取分离得到高附加值的糖类及其衍生物。
Under the condition of low temperature, aldehydes and ketones, which are unstable components of bio-oil, are upgraded by oxidation and esterification to obtain stable oxygen-containing fuel containing ester, alcohol and ether as main components. Using Amberlyst-36 ion exchange resin as catalyst and H_2O_2 as oxidant, the optimum conditions were as follows: the mass ratio of Amberlyst-36 ion exchange resin to alcohol oil was 12.5% (mass fraction) at 100 ℃, the acid value of bio-oil was 40.88 mg The value of NaOH / g dropped to 14.82 mg NaOH / g, the moisture content decreased from 36.37% to 17.54%, the calorific value increased from 14.46 MJ / kg to 25.13 MJ / kg and the viscosity decreased from 18.49 mm2 / s to 7.04 mm2 / s, C element content increased from 38.42% to 51.01%, O element reduced from 52.75% to 39.86%. Compared with the esterification, the presence of H 2 O 2 further transformed the unstable aldehydes and ketones in the system into a stable target product. The relative content of ester, alcohol and ether in the esterified oil was 84.2% The relative content of acids and aldehydes and ketones dropped to 0.08% and 5.12%, respectively, 2.60% and 4.23% less than that of esterified oil respectively. Finally, the relative content of acids and aldehydes and ketones was reduced by esterification of oil with CH_2Cl_2 Extraction and separation of high value-added sugars and their derivatives.