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

Perez, Eduardo; Tuck, Christopher O.; Poliakoff, Martyn

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.

Citation

Perez, E., Tuck, C. O., & Poliakoff, M. (in press). Valorisation of lignin by depolymerisation and fractionation using supercritical fluids and conventional solvents. Journal of Supercritical Fluids, https://doi.org/10.1016/j.supflu.2017.07.033

• Journal Article Type: Article
• Acceptance Date: Jul 28, 2017
• Online Publication Date: Aug 9, 2017
• Deposit Date: Nov 9, 2017
• Publicly Available Date: Aug 10, 2018
• Journal: Journal of Supercritical Fluids
• Print ISSN: 0896-8446
• Electronic ISSN: 1872-8162
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1016/j.supflu.2017.07.033
• Keywords: lignin valorization, fractionation, supercritical water oxidation, supercritical extraction
• Public URL: https://nottingham-repository.worktribe.com/output/877322
• Publisher URL: http://dx.doi.org/10.1016/j.supflu.2017.07.033