Nowadays, black liquor, the liquid residue from cooking step in pulp industry is burnt to produce energy for the plant. But as the pulp mills have energy in excess, higher added values applications for black liquor may be looked for. Hydrothermal treatment offers a good opportunity as it is well suited for this kind of wet feedstock. It may be used to depolymerize organic compounds or produce syngas for biofuels applications. The objective of this study is to combine phenols and biofuel production by extracting the small organic molecules formed at moderate temperature prior to complete gasification of black liquor. Hydrothermal experiments from 225 °C to 600 °C have been performed on sulfur-free black liquor in batch reactor. At 280 °C phenol, guaiacol and syringol were found in their highest quantity: 5% of the initial lignin (which represented 6 wt% of the liquid black liquor) could be converted into these three compounds.

如今，黑液，即纸浆行业蒸煮步骤中的液体残留物，被燃烧为工厂提供能源。但由于纸浆厂的能源过剩，可能会寻找更高附加值的黑液应用。水热处理提供了一个很好的机会，因为它非常适合这种湿原料。它可用于解聚有机化合物或生产用于生物燃料应用的合成气。本研究的目的是通过在黑液完全气化之前提取在中等温度下形成的小有机分子，将苯酚和生物燃料生产结合起来。已在间歇式反应器中对无硫黑液进行了 225°C 至 600°C 的水热实验。在 280 °C 下，苯酚、愈创木酚和丁香酚的含量最高：