6533b859fe1ef96bd12b784d
RESEARCH PRODUCT
Characterization of Hardwood Soda-AQ Lignins Precipitated from Black Liquor through Selective Acidification
Gokarneswar SahooHemanathan KumarRaimo Alénsubject
Environmental Engineeringsoda-AQ pulpingCarbonationCharacterizationlcsh:BiotechnologyBioengineeringPrecipitation010402 general chemistry01 natural sciencescomplex mixturesLigninback liquorchemistry.chemical_compoundlcsh:TP248.13-248.65caracterizationHardwoodOrganic chemistryLigninFourier transform infrared spectroscopyWaste Management and DisposalSoda-AQ pulpinglgninAliphatic acids010405 organic chemistryPrecipitation (chemistry)Chemistryfungifood and beveragesCarbon-13 NMRBiorefinery0104 chemical sciencespecipitationBetula pendulaaiphatic acidsBlack liquorBlack liquorNuclear chemistrydescription
In the development of integrated biorefinery process alternatives to produce value-added by-products, various black liquors from sulfur-free pulping processes offer potential feedstocks for recovering their main chemical constituents, lignin and aliphatic carboxylic acids. In this study, lignin fractions were obtained from silver birch (Betula pendula) soda-anthraquinone black liquor by carbonation (pH to about 8.5) or by acidification (pH to about 2) with H2SO4 after carbonation or directly. These fractions were characterized by Fourier transform infrared (FTIR), ultraviolet (UV), energy dispersive X-ray fluorescence (ED XRF), and 13C nuclear magnetic resonance (13C NMR) spectroscopy. In addition, the molecular weight distributions of these lignin fractions were determined. All the experimental data clearly suggested that only small differences between the precipitated lignins existed, and thus, their equal chemical utilization seems possible. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-10-03 |