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Comparison of Two Acid Hydrotropes for Sustainable Fractionation of Birch Wood.
- Source :
-
ChemSusChem [ChemSusChem] 2020 Sep 07; Vol. 13 (17), pp. 4649-4659. Date of Electronic Publication: 2020 Jun 29. - Publication Year :
- 2020
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Abstract
- This study reports on a comparative study of acid hydrotropic fractionation (AHF) of birch wood using maleic acid (MA) and p-toluenesulfonic acid (p-TsOH). Under the same level of delignification, lignin dissolved by MA is much less condensed with a higher content of ether aryl β-O-4 linkages. Lignin depolymerization dominated in MA hydrotropic fractionation (MAHF) and resulted in a single lower molecular weight peak, in contrast to the competitive depolymerization and repolymerization in p-TsOH AHF with a bimodal distribution. The less condensed MA-dissolved lignin facilitated catalytic conversion to monophenols. Carboxylation of residual lignin in fractionated cellulosic water-insoluble solids (WISs) enhanced enzymatic saccharification by decreasing nonproductive cellulase binding to lignin. At a low cellulase loading of 10 FPU g <superscript>-1</superscript> glucan, saccharification of WIS-M <subscript>T120</subscript> from MAHF at 120 °C was 95 % compared with 48 % for WIS-P <subscript>T85</subscript> from p-TsOH AHF at 85 °C under the same level of delignification of 63 %. Residual lignin carboxylation also facilitated nanofibrillation of WIS for producing lignin-containing cellulose nanofibrils (LCNFs) through an enhanced lignin lubrication effect, which substantially decreases fibrillation energy. LCNFs from only one pass of microfluidization of WIS-M <subscript>T120</subscript> have the same morphology as those from WIS-P <subscript>T85</subscript> after three passes. MA also has a lower solubility and higher minimal hydrotropic concentration, which facilitated acid recovery. MA is U.S. Food and Drug Administration (FDA)-approved as an indirect food additive, affording significant advantages compared with p-TsOH for biorefinery applications.<br /> (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1864-564X
- Volume :
- 13
- Issue :
- 17
- Database :
- MEDLINE
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 32463990
- Full Text :
- https://doi.org/10.1002/cssc.202001120