In this study, pinewood sawdust was liquefied in either ethanol/water co-solvents (50/50, wt./wt.) or pure water at 300 °C for 30 min and 10 wt% of feedstock loading, with or without the use of Na₂CO₃ or NaOH as a catalyst. The physical and chemical properties of liquefaction products (bio-crude oil and solid residue) were comprehensively characterized by FT-IR, GC-MS, elemental, GPC and TGA analyses. The results showed that the highest biomass conversion of approx. 98% was obtained in ethanol/water mixed solvents and without catalyst, along with a maximum yield of bio-crude oil (~48 wt%). The HHV of crude oil was within the range of 26–30 MJ/kg. The results indicated that the beneficial effect of ethanol on the bio-crude oil yield might be compromised by adding Na₂CO₃ or NaOH into the liquefaction system under investigated reaction conditions. As suggested by GPC analysis, the bio-crude oil obtained in ethanol/water co-solvents from both non-catalytic and catalytic liquefaction contained a slightly higher molecular weight than that obtained in pure water. Additionally, TGA results indicated that the boiling point distribution of bio-crude oil was only affected by ethanol addition, whereas, the effect of the catalyst was found to be minor.

在这项研究中，松木锯末在300°C的乙醇/水共溶剂（50/50，wt./wt。）或纯水中液化30分钟，进料量为10 wt％，无论是否使用Na ₂ CO ₃或NaOH作为催化剂。通过FT-IR，GC-MS，元素，GPC和TGA分析对液化产物（生物原油和固体残渣）的理化性质进行了全面表征。结果表明，最高的生物量转化率约为。在无催化剂的乙醇/水混合溶剂中获得98％的生物原油，最大产率（〜48 wt％）。原油的HHV在26-30 MJ / kg的范围内。结果表明，添加Na ₂可能会损害乙醇对生物原油产量的有利影响。在研究的反应条件下将CO ₃或NaOH注入液化系统。正如GPC分析所建议的那样，在乙醇/水共溶剂中从非催化液化和催化液化中获得的生物原油的分子量都比在纯水中获得的分子量稍高。另外，TGA结果表明，生物粗油的沸点分布仅受乙醇添加的影响，而发现催化剂的作用很小。