Black liquor (BL) from the kraft pulping process has been treated at elevated temperatures (380 °C) in a batch reactor to give high yields of a bio oil comprising monomeric phenolic compounds that were soluble in organic solvents and mineral oil and a water fraction with inorganic salts. The metal content in the product was <20 ppm after a simple extraction step. A correlation between concentration, temperature, and reaction time with respect to yield of desired product was found. At optimal reaction conditions (treating BL with 16 wt % dry substance at 380 °C for 20 min), the yield of extractable organics was around 80% of the original lignin with less than 7% of char. The product was analyzed by gel permeable chromatography, mass spectroscopy, nuclear magnetic resonance, elemental analysis, and inductively coupled plasma. It was found that a large fraction composed of mainly cresols, xylenols, and mesitols. This process provides a pathway to convert a major waste stream from a pulp mill into a refinery feed for fuel or chemical production, whereas at the same time the inorganic chemicals are recovered and can be returned back to the pulp mill.

中文翻译：

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在不使用催化剂或封端剂的情况下，对稀薄的黑酒进行水热加工可生产高产率的生物油

来自牛皮纸制浆工艺的黑液（BL）已在间歇式反应器中在升高的温度（380°C）下进行了处理，以提供高产率的生物油，该生物油包含可溶于有机溶剂和矿物油中的单体酚类化合物以及水馏分与无机盐。经过简单的萃取步骤后，产品中的金属含量小于20 ppm。发现浓度，温度和反应时间与所需产物的产率之间的相关性。在最佳反应条件下（在380°C下用16 wt％的干物质处理BL 20分钟），可萃取有机物的产率约为原始木质素的80％，而炭含量不到7％。通过凝胶渗透色谱，质谱，核磁共振，元素分析和电感耦合等离子体对产物进行分析。据发现，大部分由甲酚，二甲苯酚和麦索糖醇组成。该过程提供了一种途径，可以将纸浆厂的主要废物流转化为用于燃料或化学生产的炼厂原料，而与此同时，无机化学物质可以回收并可以返回到纸浆厂。