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以实验室自制的杨木木屑液化油为原料,经过水分离与离心分离后得到水溶性和水不溶性杨木木屑液化油,利用石油醚等多种极性不同的有机溶剂对两种液化油进行分级萃取,同时考察不同种类双水相体系的分相能力;利用FT-IR分析样品中所含物质官能团的变化。结果表明:水溶性液化油中乙酸乙酯的萃取率最高可达22.50%,而水不溶性液化油中氯仿的相对萃取率最高可达13.50%,磷酸氢二钠与乙醇构成的双水相体系萃取率最高,使液化油中水含量降低71.80%,达到较好的改性效果。FT-IR分析结果表明:杨木木屑液化原油经过水分离后,大部分杂质及易老化的物质被除去,可提高杨木木屑液化油的纯度和利用率。
The laboratory-made poplar sawdust liquefied oil is used as a raw material, and the water-soluble and water-insoluble poplar sawdust liquefied oil is obtained through water separation and centrifugal separation. The two liquefied oils are subjected to various polar solvents such as petroleum ether Fractional extraction, at the same time to investigate different types of aqueous two-phase separation capabilities; use of FT-IR analysis of the material contained in the functional group changes. The results showed that the extraction rate of ethyl acetate in water-soluble liquefied oil was up to 22.50%, while the relative extraction rate of chloroform in water-insoluble liquefied oil was up to 13.50%. The aqueous two-phase system composed of disodium hydrogen phosphate and ethanol The highest rate, so that the water content of liquefied oil decreased 71.80%, to achieve better modification effect. FT-IR analysis results showed that most of the impurities and aging-prone substances were removed after the liquefied crude oil of poplar wood chips was separated by water, which could improve the purity and utilization rate of poplar sawdust liquefied oil.