Mild thermolytic solvolysis of technical lignins in polar organic solvents to a crude lignin oil

作者: Panos D. Kouris , Dannie J. G. P. van Osch , Geert J. W. Cremers , Michael D. Boot , Emiel J. M. Hensen

DOI: 10.1039/D0SE01016B

关键词: EthanolSolventMethanolGel permeation chromatographyLigninCondensation reactionChemistryNuclear chemistryAlcoholSolvolysis

摘要: A mild thermal solvolysis process using alcohols for the valorization of technical Protobind soda lignin into crude oil (CLO) is presented. The solubilization results in lower molecular weight fragments (1250–1550 g mol−1cf. 2500 mol−1 parent lignin), while rejecting heavy compounds and other solid impurities. influence reaction temperature (100–350 °C), residence time (0.5–4 h), lignin : solvent ratio (1 : 15–1 : 2 w/v) alcohol solvent (methanol, ethanol, 1-propanol, 1-butanol, 1-octanol) on amount type products investigated. At a high loading (ratio < 1 : 5 under optimum conditions (T = 200 °C, t 0.5 condensation reactions consumption are minimized. Methanol exhibits highest solvolytic efficacy resulting an overall degree 61 wt%, which includes some heavier fractions originating from reactions. resulted 57 wt% 53 51 1-butanol 38 1-octanol. losses based GC-MS analysis obtained CLOs were 1.1 methanol, 1.4 ethanol 2.2 1-butanol. Hansen solubility parameters employed to discuss effect process. Gel permeation chromatography heteronuclear single quantum coherence NMR solubilized revealed cleavage β-O-4 bonds during solvolysis, explaining reduction. most favourable utilized 5 different biorefinery lignins. In all cases, this led CLO with fragments, polydispersity increased hydroxyl group content.

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