Depolymerized real lignin products are very complex mixtures. Comprehensive assessment of the decomposition efficiency and characterizing of depolymerized products still remain extremely challenging. In this study, based on depolymerization solution of commercially available sodium lignosulfonate under mild conditions, an improved method was well established for characterization of real lignin depolymerized products using GC–MS, which enabled the detection of main 37 lignin-based aromatic products. The effects of acid-catalyzed temperature, time and catalyst/lignin ratio on the depolymerization products were systematically investigated. The result revealed that ~ 25 wt% of lignosulfonate was depolymerized into lignin-derived aromatic products under optimized mild acid-catalyzed reaction conditions of 130 °C for 60 min with a catalyst/lignin ratio of 2.334. Most of the identified products were common commercial compounds, while the obtained bisphenols were potential compounds for new applications such as bio-based polymer building blocks. Preliminary studies also highlight that the depolymerization behavior seems to present selectivity to some extent during these specified acid-catalyzed reaction.

中文翻译：

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使用气相色谱-质谱法在酸催化条件下表征木质素磺酸盐解聚产物

解聚的真正木质素产品是非常复杂的混合物。对解聚产物的分解效率和表征的综合评估仍然极具挑战性。在本研究中，基于市售木质素磺酸钠在温和条件下的解聚溶液，建立了一种使用 GC-MS 表征真正木质素解聚产物的改进方法，该方法能够检测主要的 37 种木质素基芳烃产物。系统研究了酸催化温度、时间和催化剂/木质素比对解聚产物的影响。结果表明，在优化的温和酸催化反应条件下，约 25 wt% 的木质素磺酸盐在 130°C 的温和酸催化反应条件下解聚为 60 分钟，催化剂/木质素比为 2.334。大多数确定的产品是常见的商业化合物，而获得的双酚是新应用的潜在化合物，如生物基聚合物构建块。初步研究还强调，在这些特定的酸催化反应过程中，解聚行为似乎在一定程度上表现出选择性。