Abstract In this study, the influence of the degree of unsaturation of the triglyceride on the composition of the products of the thermal cracking process, in particular the formation of aromatic compounds, was investigated. Experiments were performed using triglyceride sources with different degrees of unsaturation, maintaining the same operational conditions. Analysis of the products revealed that a greater amount of aromatic compounds is formed during the thermal cracking of biomass with a higher degree of unsaturation. The aromatics content in the liquid product decreased by 14% in the cracking of biomass with the lowest unsaturated content. A correlation between the aromatics content and the iodine index of the sample was proposed, as a simple way to estimate the aromatics content in bio-oil. It was also observed that the reactions for carboxyl removal were favorable in the case of saturated compounds, the acidity index reducing from 210.9 to 139.0 gKOH/g in the biomass with the lowest unsaturated content. However, long-chain paraffinic compounds were present in the products, which suggests that a catalyst or more severe conditions might be necessary for the biomass cracking.

中文翻译：

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甘油三酯不饱和度对生物油中芳烃含量的影响

摘要 在这项研究中，研究了甘油三酯的不饱和度对热裂解过程产物组成的影响，特别是芳族化合物的形成。使用具有不同不饱和度的甘油三酯源进行实验，保持相同的操作条件。对产物的分析表明，在生物质热裂解过程中形成了更多的芳香族化合物，具有更高的不饱和度。在不饱和含量最低的生物质裂解过程中，液体产物中芳烃含量降低了 14%。提出了芳烃含量与样品碘指数之间的相关性，作为估算生物油中芳烃含量的简单方法。还观察到，在饱和化合物的情况下，脱羧反应是有利的，酸度指数从 210.9 降低到 139.0 gKOH/g，在具有最低不饱和含量的生物质中。然而，产物中存在长链烷烃化合物，这表明生物质裂解可能需要催化剂或更苛刻的条件。