Lignin is an attractive feed for biofuels and biobased chemicals. We here report the conversion of kraft lignin (Lignoboost) to liquids by hydropyrolysis using a zinc based (molten) salt in a semi-batch reactor. m-Cresol was used to dissolve and inject the lignin into the heated and pressurized reactor containing the molten salt. The liquid yield and fraction of organics in the liquid was optimized by varying the process parameters (hydropyrolysis temperature, pressure, hydrogen gas flow rate and salt to lignin ratio). The highest liquid yield of around 78 wt% was obtained using small amounts of salts (2.5 wt% of salts based on lignin input, 350 °C, 30 bar, 33 wt% lignin in m-cresol, hydrogen flow rate of 160 mL/min). A larger excess of salts gave a lower liquid yield, implying that catalytic amounts of salts are preferred. In addition, small amounts of salts are essential for depolymerization and the formation of lower molecular weight components, as was evident by comparing experiments with and without salts. The liquid product was shown to consist of low molecular weight phenolics like dimethyl- and ethyl-cresol, methyl guaiacol and oligomers (GC-MS, 2DGC-FID, NMR and GPC analysis). The product oil may have potential for biofuel production when coupled with a catalytic hydrotreatment step to obtain hydrocarbons or, after downstream processing and catalytic conversions, to important biobased chemicals like green phenol.

中文翻译：

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使用氯化锌基（熔融）盐有效解聚硫酸盐木质素


木质素是生物燃料和生物基化学品的一种有吸引力的原料。我们在这里报告了在半间歇反应器中使用锌基（熔融）盐通过加氢热解将硫酸盐木质素（Lignoboost）转化为液体。使用间甲酚溶解木质素并将其注入装有熔盐的加热加压反应器中。通过改变工艺参数（加氢热解温度、压力、氢气流速和盐与木质素之比）来优化液体产率和液体中有机物的分数。使用少量盐获得了约 78 wt% 的最高液体收率（基于木质素输入的 2.5 wt% 盐，350 °C，30 bar，间甲酚中的 33 wt% 木质素，氢气流量为 160 mL/分钟）。过量的盐导致较低的液体产率，这意味着优选催化量的盐。此外，少量的盐对于解聚和形成较低分子量组分是必需的，通过比较有盐和无盐的实验可以明显看出。液体产物由低分子量酚类物质组成，如二甲基甲酚和乙基甲酚、甲基愈创木酚和低聚物（GC-MS、2DGC-FID、NMR 和 GPC 分析）。当与催化加氢处理步骤相结合以获得碳氢化合物时，成品油可能具有生产生物燃料的潜力，或者在下游加工和催化转化后，生产重要的生物基化学品，如绿色苯酚。