Facile synthesis of vanillin from fractionated Kraft lignin

Research output: Contribution to journalArticleScientificpeer-review

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.
Original languageEnglish
Article number112095
JournalIndustrial Crops and Products
Volume145
Number of pages7
ISSN0926-6690
DOIs
Publication statusPublished - Mar 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 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

Cite this