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Lignin enhances cellulose dissolution in cold alkali

Costa, Carolina (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,FSCN
Medronho, Bruno (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,University of Algarve, Portugal,FSCN
Eivazi, Alireza (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,FSCN
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Svanedal, Ida, 1979- (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,FSCN
Lindman, Björn (author)
Lund University,Lunds universitet,Mittuniversitetet,Institutionen för kemiteknik,FSCN,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,University of Coimbra
Edlund, Håkan, 1966- (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,FSCN
Norgren, Magnus, 1967- (author)
Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,FSCN
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 (creator_code:org_t)
Elsevier BV, 2021
2021
English.
In: Carbohydrate Polymers. - : Elsevier BV. - 0144-8617 .- 1879-1344. ; 274
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Aqueous sodium hydroxide solutions are extensively used as solvents for lignin in kraft pulping. These are also appealing systems for cellulose dissolution due to their inexpensiveness, ease to recycle and low toxicity. Cellulose dissolution occurs in a narrow concentration region and at low temperatures. Dissolution is often incomplete but additives, such as zinc oxide or urea, have been found to significantly improve cellulose dissolution. In this work, lignin was explored as a possible beneficial additive for cellulose dissolution. Lignin was found to improve cellulose dissolution in cold alkali, extending the NaOH concentration range to lower values. The regenerated cellulose material from the NaOH-lignin solvents was found to have a lower crystallinity and crystallite size than the samples prepared in the neat NaOH and NaOH-urea solvents. Beneficial lignin-cellulose interactions in solution state appear to be preserved under coagulation and regeneration, reducing the tendency of crystallization of cellulose. 

Subject headings

NATURVETENSKAP  -- Kemi -- Polymerkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Keyword

Cellulose amphiphilicity
Dissolution
Lignin
NaOH (aq.) solvent
Cellulose amphiphilicity
Dissolution
Lignin
NaOH (aq.) solvent

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ref (subject category)
art (subject category)

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