Similarities in Recalcitrant Structures of Industrial Non-Kraft and Kraft Lignin.,ChemSusChem

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Similarities in Recalcitrant Structures of Industrial Non-Kraft and Kraft Lignin.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/cssc.202001219
Andrew W Tricker _{1,

2} , Michael J Stellato _{1,

2} , Thomas T Kwok _{1,

2} , Nicholas S Kruyer _{1,

2} , Zhongzhen Wang _{1,

2} , Sankar Nair _{1,

2} , Valerie M Thomas _{1,

3} , Matthew J Realff _{1,

2} , Andreas S Bommarius _{1,

2,

4} , Carsten Sievers _{1,

2,

4}

Affiliation

This work compares the structure of industrially isolated lignin samples from kraft pulping and three alternative processes: butanol organosolv, supercritical water hydrolysis, and sulfur dioxide/ethanol/water fractionation. Kraft processes are known to produce highly condensed lignin, with reduced potential for catalytic depolymerization, whereas the alternative processes have been hypothesized to impact the lignin less. The structural properties most relevant to catalytic depolymerization are characterized by elemental analysis, quantitative ¹³C and 2 D HQSC NMR spectroscopy, gel permeation chromatography, and thermogravimetric analysis. Quantification of the β‐O‐4 ether bond content shows partial depolymerization, with all samples having less than 12 bonds per 100 aromatic units. This results in theoretical monomer yields of less than 5 %, strongly suggesting the alternative fractionation processes generate highly condensed lignin structures that are no more suitable for catalytic depolymerization than kraft lignin. However, the different thermal degradation profiles suggest there are physicochemical differences that could be leveraged in other valorization strategies.

中文翻译：

工业非牛皮纸和牛皮纸木质素的顽固结构相似。

这项工作比较了牛皮纸制浆和三种替代方法的工业分离木质素样品的结构：丁醇有机溶剂，超临界水水解和二氧化硫/乙醇/水分馏。已知牛皮纸法可生产高度冷凝的木质素，催化解聚的潜力降低，而据推测，替代方法可减少对木质素的影响。与催化解聚最相关的结构性质是通过定量的元素分析来表征的¹³C和2 D HQSC NMR光谱，凝胶渗透色谱和热重分析。对β-O-4醚键含量的定量显示了部分解聚，所有样品每100个芳族单元的键数少于12个。这导致理论上的单体收率低于5％，这强烈表明，替代的分馏方法会产生高度缩合的木质素结构，这种结构不像牛皮纸木质素更适合催化解聚。但是，不同的热降解曲线表明存在其他理化策略可以利用的理化差异。

更新日期：2020-06-15

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