水相循环对玉米秸秆水热液化成油特性影响的研究

以玉米秸秆为原料,以去离子水为介质,研究水相循环对玉米秸秆水热液化成油特性的影响。循环过程中不额外添加去离子水,对循环前后的水相产物、生物原油和固体产物进行对比研究发现,水相循环产生有机酸的富集效应,促进酮酚类的转化,两者共同作用提高生物原油和固体产物的产率和品质。具体表现为:水相循环对水相pH值影响较小(3. 62-3. 91),但可以使乙酸和丙酸等有机酸不断累积,同时使酮类、酚类化合物含量逐渐减少;水相循环可以使生物原油产率从20. 42%逐步提高至24. 31%,且可略提升油品质;水相循环可以使固体产物的碳含量由60. 94%提升至61. 74%。

Effect of aqueous phase recirculation on characteristics of bio-crude oil formation during hydrothermal liquefaction of corn stalk

The corn stalk was used as the raw material and the deionized water was used as the medium to study the effect of aqueous phase recirculation on characteristics of bio-crude oil formation during hydrothermal liquefaction of corn stalk. No additional deionized water was added during the recirculation. The results show that the aqueous phase recirculation can enrich the concentration of organic acids in aqueous phase and promote the conversion of ketophenols, which can improve the yield and quality of bio-crude oil and solid products. Specifically, the aqueous phase recirculation has little effect on the pH value of the aqueous phase (3.62-3.91), but the organic acids such as acetic acid and propionic acid are continuously accumulated and the content of ketones and phenols is gradually reduced. Also, the yield of bio-crude oil is gradually increased from 20.42% to 24.31%, the quality of bio-crude oil is slightly improved, and the carbon content of the solid product is increased from 60.94% to 61.74%.