Benign Fractionation of Lignin with CO2-Expanded Solvents of Acetic Acid + Water

Adam S. Klett, A. Mark Payne, Thanaphong Phongpreecha, David B. Hodge, Mark C. Thies

Research output: Research - peer-reviewArticle

Abstract

(Graph Presented) Kraft lignin was fractionated by molecular weight (MW), using CO2-expanded solutions of acetic acid/water in a 90/10 wt/wt ratio. In particular, as CO2 pressures were increased from 7 bar to 48 bar, expanding the liquid-solvent phase and reducing its dielectric strength, lignin fractions decreasing in MW from 15 000 to 1250, with polydispersity index (PDI) values decreasing from 3.7 to 1.6, were obtained. The recovered lignin fractions were similar, in terms of chemical functionality. With the use of gas-expanded liquids (GXL), only one solvent composition is required, and recovery and reuse of the biorenewable CO2 + acetic acid-water solution is facilitated through pressure release and recompression. The process was demonstrated for the recovery of seven lignin fractions to demonstrate its versatility and effectiveness, but simpler operation with recovery of just a low MW lignin fraction and a high MW lignin fraction is more consistent with anticipated applications.

LanguageEnglish (US)
Pages9778-9782
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume56
Issue number34
DOIs
StatePublished - Aug 30 2017

Profile

Lignin
Carbon Monoxide
Fractionation
Acetic Acid
Water
Acetic acid
Molecular weight
Recovery
Liquids
Polydispersity
Gases
Chemical analysis
Kraft lignin

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Benign Fractionation of Lignin with CO2-Expanded Solvents of Acetic Acid + Water. / Klett, Adam S.; Payne, A. Mark; Phongpreecha, Thanaphong; Hodge, David B.; Thies, Mark C.

In: Industrial and Engineering Chemistry Research, Vol. 56, No. 34, 30.08.2017, p. 9778-9782.

Research output: Research - peer-reviewArticle

Klett, Adam S. ; Payne, A. Mark ; Phongpreecha, Thanaphong ; Hodge, David B. ; Thies, Mark C./ Benign Fractionation of Lignin with CO2-Expanded Solvents of Acetic Acid + Water. In: Industrial and Engineering Chemistry Research. 2017 ; Vol. 56, No. 34. pp. 9778-9782
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