Peracetic Acid Depolymerization of Biorefinery Lignin for Production of Selective Monomeric Phenolic Compounds

详细信息    查看全文

• 作者：Ruoshui Ma ; Mond Guo ; Kuan-ting Lin ; Prof. Dr. Vincent R. Hebert ; Prof. Dr. Jinwen Zhang ; Prof. Dr. Michael P. Wolcott ; Melissa Quintero ; Dr. Karthikeyan K. Ramasamy ; Dr. Xiaowen Chen and Prof. Dr. Xiao Zhang
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：July 25, 2016
• 年：2016
• 卷：22
• 期：31
• 页码：10884-10891
• 全文大小：1533K
• ISSN：1521-3765

文摘

Lignin is the largest source of renewable material with an aromatic skeleton. However, due to the recalcitrant and heterogeneous nature of the lignin polymer, it has been a challenge to effectively depolymerize lignin and produce high-value chemicals with high selectivity. In this study, a highly efficient lignin-to-monomeric phenolic compounds (MPC) conversion method based on peracetic acid (PAA) treatment was reported. PAA treatment of two biorefinery lignin samples, diluted acid pretreated corn stover lignin (DACSL) and steam exploded spruce lignin (SESPL), led to complete solubilization and production of selective hydroxylated monomeric phenolic compounds (MPC-H) and monomeric phenolic acid compounds (MPC-A) including 4-hydroxy-2-methoxyphenol, p-hydroxybenzoic acid, vanillic acid, syringic acid, and 3,4-dihydroxybenzoic acid. The maximized MPC yields obtained were 18 and 22 % based on the initial weight of the lignin in SESPL and DACSL, respectively. However, we found that the addition of niobium pentoxide catalyst to PAA treatment of lignin can significantly improve the MPC yields up to 47 %. The key reaction steps and main mechanisms involved in this new lignin-to-MPC valorization pathway were investigated and elucidated.