SO2-Ethanol-Water (SEW) Pulping: I. Lignin Determination in Pulps and Liquors

Quantitative determination of lignin in SO₂-ethanol-water (SEW) pulps and spent liquors is described. The methods developed for conventional sulfite pulping are successfully applied to the SEW process. Linear correlations between Klason/total lignin content and kappa number are found over a wide pul...

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Bibliographic Details
Published inJournal of wood chemistry and technology Vol. 31; no. 3; pp. 233 - 249
Main Authors Iakovlev, Mikhail, van Heiningen, Adriaan
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.07.2011
Subjects
Acid-soluble lignin
Beech
biorefinery
delignification
Dissolution
ethanol
kappa number
Klason lignin
lignin determination
organosolv pulping
Pulping
Reduction
SEW pulping
Sodium
Straw
sulfur dioxide
Sulfuric acid
Wood
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Summary:Quantitative determination of lignin in SO₂-ethanol-water (SEW) pulps and spent liquors is described. The methods developed for conventional sulfite pulping are successfully applied to the SEW process. Linear correlations between Klason/total lignin content and kappa number are found over a wide pulp yield range for spruce, beech, and wheat straw. Lignin content of the spruce spent SEW liquors is determined using either hydrogen peroxide to remove SO₂ and dilution by 3% sulfuric acid or simply by dilution with 0.1M sodium hydroxide. The recommended wavelength is 280 nm. The experimentally found values for the extinction coefficient of dissolved lignin in 3% sulfuric acid and in 0.1M NaOH are 19 and 23 L/(g·cm), respectively. The interference of furanic compounds is eliminated by reduction with sodium borohydride.
Bibliography:http://dx.doi.org/10.1080/02773813.2010.523161
ObjectType-Article-2
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ISSN:1532-2319
0277-3813
1532-2319
DOI:10.1080/02773813.2010.523161