Valorisation of lignin by depolymerisation and fractionation using supercritical fluids and conventional solvents

Perez, Eduardo and Tuck, Christopher O. and Poliakoff, Martyn (2017) Valorisation of lignin by depolymerisation and fractionation using supercritical fluids and conventional solvents. Journal of Supercritical Fluids . ISSN 1872-8162

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Abstract

A procedure for Lignosulphonate valorisation is investigated. An attempt has been made to obtain diverse value-added products maximizing the atom economy. This procedure is carried in sequential steps starting with an oxidative depolymerization in supercritical water. Next, the reaction mixture is fractionated according to its solubility in water and in ethyl acetate. Several analytical methods - CHN elemental analysis, aqueous GPC and 31P-NMR - were used to determine the composition of these fractions and to assess their suitability for different applications. Water-insoluble fractions were converted to a lignin-derived hydrochar for the synthesis of active carbon of superior quality. Monomers were recovered from bio-oil fraction by supercritical carbon dioxide extraction and the remaining oil is proposed as a potential starting material for the synthesis of polyurethane foams.

Item Type: Article
Keywords: lignin valorization, fractionation, supercritical water oxidation, supercritical extraction
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number: 10.1016/j.supflu.2017.07.033
Depositing User: Poliakoff, Martyn
Date Deposited: 09 Nov 2017 13:40
Last Modified: 09 Nov 2017 13:44
URI: http://eprints.nottingham.ac.uk/id/eprint/48002

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