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Int. J. Mol. Sci. 2017, 18(12), 2520; doi:10.3390/ijms18122520

Controlling the Molecular Weight of Lignosulfonates by an Alkaline Oxidative Treatment at Moderate Temperatures and Atmospheric Pressure: A Size-Exclusion and Reverse-Phase Chromatography Study

French National Centre for Scientific Research (CNRS), University Grenoble Alpes, Grenoble INP, LGP2, F-38000 Grenoble, France
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Received: 2 October 2017 / Revised: 14 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
(This article belongs to the Special Issue The Lignin Challenge: Exploring Innovative Applications)
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Abstract

The molecular weights of lignosulfonates (LSs) are modified by a rather simple process involving an alkaline oxidative treatment at moderate temperatures (70–90 °C) and atmospheric pressure. Starting from LSs with an average molecular weight of 90,000 Da, and using such a treatment, one can prepare controlled molecular weight LSs in the range of 30,000 to 3500 Da based on the average mass molecular weight. The LS depolymerisation was monitored via reverse-phase and size-exclusion chromatography. It has been shown that the combination of O2, H2O2 and Cu as a catalyst in alkaline conditions at 80 °C induces a high LS depolymerisation. The depolymerisation was systemically accompanied by a vanillin production, the yields of which reached 1.4 wt % (weight percentage on LS raw basis) in such conditions. Also, the average molecular weight and vanillin concentration were correlated and depended linearly on the temperature and reaction duration. View Full-Text
Keywords: lignosulfonates; depolymerisation; size-exclusion chromatography lignosulfonates; depolymerisation; size-exclusion chromatography
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Guizani, C.; Lachenal, D. Controlling the Molecular Weight of Lignosulfonates by an Alkaline Oxidative Treatment at Moderate Temperatures and Atmospheric Pressure: A Size-Exclusion and Reverse-Phase Chromatography Study. Int. J. Mol. Sci. 2017, 18, 2520.

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