Structural modification of commercial lignosulphonates through laccase catalysis and ozonolysis

QC 20101210
Lignosulphonates are by-products from the sulphite pulping process, in which lignin is separated from cellulose by the addition of sulphonic acid groups to the alpha-position of lignin, thereby increasing the solubility of lignin in water. The predominant industrial utilisations of lignosulphonates are as dispersants, plasticisers and water-reducing agents in concrete preparation. The ability of lignosulphonates to function as a good plasticisers and water reducers is intimately linked with the purity of the lignosulphonate, its molecular weight and the number of charged groups present in the macromolecule. Currently, lignosulphonates are outrivaled by synthetic plasticisers termed superplasticisers due to their superior properties when used as additives to high-strength concrete. If lignosulphonates are to successfully compete with these superplasticisers, significant modifications are required. This paper describes a two-stage treatment of lignosulphonates in which the molecular weight is increased through laccase oxidation and carboxylic groups are introduced through ozonolysis. The technical significance of the results is also discussed.

TEKNIK OCH TEKNOLOGIER Materialteknik Pappers-, massa- och fiberteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Paper, Pulp and Fiber Technology hsv//eng
Lignosulphonates
Biotechnology
Plasticisers
Concrete
Cement
Laccase
Ozonolysis
Molecular weight
Carboxylic acids
Cellulose and paper engineering
Cellulosa- och pappersteknik

Li, JiebingKTH,Träkemi och massateknologi(Swepub:kth)u1rxxt8l (författare)
Gellerstedt, GöranKTH,Träkemi och massateknologi(Swepub:kth)u1pqzekk (författare)
Henriksson, GunnarKTH,Träkemi och massateknologi(Swepub:kth)u1lkf75c (författare)
KTHTräkemi och massateknologi (creator_code:org_t)

Ingår i:Industrial crops and products (Print): Elsevier BV32:3, s. 458-4660926-66901872-633X

Av författaren/redakt...: Areskogh, Dimitr ...; Li, Jiebing; Gellerstedt, Gör ...; Henriksson, Gunn ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Pappers massa oc ...

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