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Process development for tall oil lignin production.

Jonathan A Diaz-Baca1, Pedram Fatehi1

  • 1Green Processes Research Centre and Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B5E1, Canada.

Bioresource Technology
|March 6, 2021
PubMed
Summary

This study details a new method for producing tall oil lignin (TOL) and compares its properties to kraft lignin (KL). The novel TOL exhibits unique characteristics, including high sulfur content, making it suitable for vulcanization and epoxy resin applications.

Keywords:
Biomass fractionationBiorefiningKraft pulpingTall oil

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Area of Science:

  • Biomass Valorization
  • Pulping Chemistry
  • Green Chemistry

Background:

  • Kraft pulping generates lignin as a byproduct.
  • Tall oil soap (TOS) is a byproduct of the kraft pulping process.
  • Lignin valorization is crucial for biorefinery sustainability.

Purpose of the Study:

  • To investigate the production and characterization of tall oil lignin (TOL) using the LignoTall process.
  • To compare the physicochemical properties of TOL with kraft lignin (KL) produced via LignoForce technology.
  • To assess the potential applications of TOL based on its unique properties.

Main Methods:

  • Production of TOL from TOS using the LignoTall process.
  • Characterization of TOL and KL using various analytical techniques.
  • Comparison of molecular weight, elemental composition, and functional group content.

Main Results:

  • TOL and KL exhibited significantly different characteristics despite originating from the same source.
  • TOL demonstrated higher molecular weight, O/C elemental ratio, sulfur content, and carboxylate-OH content compared to KL.
  • TOL had lower methoxy group content than KL.
  • TOL contained 7.3% sulfur and 0.56 mmol/g carboxylate-OH.

Conclusions:

  • Production methods significantly impact lignin properties.
  • The high sulfur content of TOL is beneficial for vulcanization processes.
  • The high carboxylate-OH content of TOL makes it suitable for epoxy resin production.
  • TOL represents a promising bio-based material for industrial applications.