Structural changes and pyrolysis behavior of lignins derived from black liquor of soda-anthraquinone (SAL) and soda-oxygen pulping (SOL) for wheat straw at similar delignification rates have been investigated. The lignin was first isolated through acid precipitation and then was characterized by various analytical techniques, including elemental analysis, gel permeation chromatography, Fourier transform infrared spectroscopy,¹³C–¹H heteronuclear single quantum correlation spectra analysis, and thermogravimetry mass spectrometry. At similar delignification rates, the pulping process for gaining quality pulp, SOL contained more (β-O-4) structure and hydroxyl and carbonyl groups, which provided promising results for depolymerization and pyrolysis. SOL showed superior pyrolysis properties including higher combustibility gas formation and lower pyrolysis temperature. Small group organic products like acetic acid and furural could be released from SOL at 100 °C lower temperature, while more methane could be produced in a larger temperature range.

中文翻译：

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苏打氧和苏打-AQ制浆后黑液中的小麦秸秆木质素的比较研究：结构变化和热解行为

研究了在相似的脱木素率下，苏打蒽醌黑液（SAL）和苏打氧制浆（SOL）衍生的木质素的结构变化和热解行为。木质素首先通过酸沉淀法分离，然后通过各种分析技术进行表征，包括元素分析，凝胶渗透色谱，傅里叶变换红外光谱，¹³ C– ¹H异核单量子相关光谱分析和热重分析质谱。在相似的脱木素速度下，制浆过程获得优质纸浆，SOL包含更多的（β-O-4）结构以及羟基和羰基基团，这为解聚和热解提供了有希望的结果。SOL显示出优异的热解性能，包括更高的可燃气体形成和更低的热解温度。较低温度下100°C可以从SOL中释放出乙酸和糠醛之类的小型有机产品，而在较大温度范围内可以产生更多的甲烷。