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Physiochemical characterization of synthetic bio-oils produced from bio-mass: a sustainable source for construction bio-adhesives

机译：由生物质生产的合成生物油的理化特性：建筑生物胶粘剂的可持续来源

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This paper investigates physicochemical properties of four different types of bio-oil produced through hydrothermal liquefaction (HTL) and vacuum pyrolysis including wood pallet, corn stover, miscanthus and swine manure. It should be noted that the term bio-oil in this paper is used to refer to synthesized oil from post processing of biomass. Accordingly, swine manure was processed under HTL conditions of 340 degrees C, 10-12 MPa with 15 min residence time. Bio-oils from miscanthus, corn stover and wood pellet were produced at 450 degrees C under vacuum pyrolysis. Furthermore, in this paper the merit of applying each of these bio-oils as a precursor for producing bio-adhesive was studied using physiochemical and rheological characterization. Chemical functional groups and individual compounds were identified with GC-MS, NMR and FT-IR, while molecular weight distribution determined using GPC showed that wood pellet bio-oil has the lowest molecular weight followed by those from corn stover, miscanthus and swine manure. In addition, boiling point distributions of different fractions of bio-oils were analyzed. Furthermore, TLC-FID was used to determine different fractions of bio-oils based on their solubility in comparison with those of petroleum. It was shown that overall bio-oils from woody bio-mass have higher amount of alcoholic compounds as evidenced by the presence of strong peaks related to ether and alcohols in FTIR spectra; in addition, the TLC-FID analysis showed presence of higher fraction of fused poly aromatic rings referred to "asphaltene" in bio-oils produced from woody biomass compared to bio-oils from swine manure. The results of our characterization show the importance of feedstock composition and their effect on the characteristics of bio-oils as well as their applicability for use in bio-adhesives production.
机译：本文研究了通过水热液化（HTL）和真空热解产生的四种不同类型的生物油的理化性质，包括木板，玉米秸秆，桔梗和猪粪。应该注意的是，本文中的生物油一词是指生物质后处理后的合成油。因此，在340℃，10-12MPa的HTL条件下以15分钟的停留时间处理猪粪。在450℃真空热解下，生产了来自桔属，玉米秸秆和木质颗粒的生物油。此外，在本文中，通过理化和流变学特性研究了将每种生物油用作生产生物粘合剂的前驱体的优点。化学官能团和单个化合物通过GC-MS，NMR和FT-IR进行鉴定，而使用GPC测定的分子量分布表明，木质颗粒生物油的分子量最低，其次是玉米秸秆，桔梗和猪粪。此外，分析了不同比例的生物油的沸点分布。此外，TLC-FID用于根据与石油的溶解度确定生物油的不同馏分。研究表明，木质生物质中的整体生物油中酒精化合物的含量更高，这在FTIR光谱中存在与醚和醇有关的强峰即可证明。此外，TLC-FID分析表明，与猪粪肥相比，木质生物质产生的生物油中存在更高比例的被称为“沥青质”的稠合多芳环。我们表征的结果表明了原料组成的重要性及其对生物油特性的影响，以及它们在生物胶粘剂生产中的适用性。

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