Facile synthesis of vanillin from fractionated Kraft lignin

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http://hdl.handle.net/10138/314136

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Zhang , R , Maltari , R , Guo , M , Kontro , J , Eronen , A & Repo , T 2020 , ' Facile synthesis of vanillin from fractionated Kraft lignin ' , Industrial Crops and Products , vol. 145 , 112095 . https://doi.org/10.1016/j.indcrop.2020.112095

Title: Facile synthesis of vanillin from fractionated Kraft lignin
Author: Zhang, Rui; Maltari, Riku; Guo, Ming; Kontro, Jussi; Eronen, Aleksi; Repo, Timo
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Microbiology
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2020-03
Language: eng
Number of pages: 7
Belongs to series: Industrial Crops and Products
ISSN: 0926-6690
URI: http://hdl.handle.net/10138/314136
Abstract: More than 90 % of global lignin production comes from Kraft pulp mills but due to shortage of economical viable methods to valorise lignin, it is commonly burned for energy. Therefore, finding new routes to utilize Kraft lignin (KL) as a renewable raw material for the chemical industry is of significant economic and environmental importance. Herein we report a novel, two-step procedure for facile synthesis of vanillin from technical KL by combining solvent fractionation and catalytic oxidation reaction. From the studied green solvents, 1-propanol was the most attractive for one-step, single solvent fractionation as it afforded uniform, low molecular weight lignin fractions (Mw=1300 g·mol−1, Mn=580 g·mol−1) with yield of 46 wt%. Using this homogeneous lignin as a raw material, CuSO4 catalyzed oxidation reaction proceeds smoothly, and under optimized conditions a high vanillin yield of 10.9 wt% was achieved. The method reported herein is promising as it facilitates straightforward and high yield vanillin synthesis from commercially available technical KL.
Subject: ANTIOXIDANT
CATALYTIC-OXIDATION
Catalytic oxidation
DEPOLYMERIZATION
Kraft lignin
MECHANISM
PHENOLIC DERIVATIVES
PRECIPITATION
PRETREATMENT
SOFTWOOD
SOLVENT FRACTIONATION
Single solvent fractionation
VALUABLE CHEMICALS
Vanillin synthesis
116 Chemical sciences
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