Hydrolytic depolymerization of hydrolysis lignin: Effects of catalysts and solvents

被引：75
|
作者：
Mahmood, Nubla [1 ]
Yuan, Zhongshun [1 ]
Schmidt, John [2 ]
Xu, Chunbao [1 ]
机构：
[1] Univ Western Ontario, Dept Chem & Biochem Engn, ICFAR, London, ON N6GA 5B9, Canada
[2] FPInnovat, Pointe Claire, PQ H9R 3J9, Canada
来源：
BIORESOURCE TECHNOLOGY | 2015年 / 190卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Hydrolysis lignin; Depolymerization; Water; Water-ethanol mixture; Acid/base; LIGNOCELLULOSIC BIOMASS; CHEMICAL FEEDSTOCKS; LIQUEFACTION; CELLULOSE; POLYOLS;
D O I：
10.1016/j.biortech.2015.04.074
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Hydrolytic depolymerization of hydrolysis lignin (HL) in water and water-ethanol co-solvent was investigated at 250 degrees C for 1 h with 20% (w/v) HL substrate concentration with or without catalyst (H2SO4 or NaOH). The obtained depolymerized HLs (DHLs) were characterized with GPC-UV, FTIR, GC-MS, H-1 NMR and elemental analyzer. In view of the utilization of depolymerized HL (DHL) for the preparation of rigid polyurethane foams/resins un-catalyzed depolymerization of HL employing water-ethanol mixture appeared to be a viable route with high yield of DHL similar to 70.5 wt.% (SR yield of similar to 9.8 wt.%) and with M-w as low as similar to 1000 g/mole with suitable aliphatic (227.1 mg KOH/g) and phenolic (215 mg KOH/g) hydroxyl numbers. The overall % carbon recovery under the selected best route was similar to 87%. Acid catalyzed depolymerization of HL in water and water-ethanol mixture lead to slightly increased M-w. Alkaline hydrolysis helped in reducing M-w in water and opposite trend was observed in water-ethanol mixture. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：416 / 419
页数：4
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