Optimization of Lignin Recovery from the Pre-Hydrolysate of Kraft-Based Dissolving Pulp Production Processes

Mazar, Adil and Jemaa, Naceur and Wafa Al Dajani, Waleed and Marinova, Mariya and Perrier, Michel (2021) Optimization of Lignin Recovery from the Pre-Hydrolysate of Kraft-Based Dissolving Pulp Production Processes. Applied Sciences, 11 (1). p. 454. ISSN 2076-3417

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Abstract

A pre-hydrolysate is an aqueous stream obtained during the production of hardwood kraft dissolving pulp. It is rich in sugars and contains dissolved organic matters. The purpose of this study is to investigate the optimization of lignin recovery from wood pre-hydrolysates and to characterize the extracted lignin. The optimal conditions for lignin extraction have been determined to be (a) a filtration temperature of 40 °C, (b) a sulfuric acid concentration of 8.5 kg·m−3, and (c) a coagulation time of 180 min. Using these conditions, high filtration rates have been obtained and the extracted lignin has a low content of impurities (8.3%), a low molecular weight (1270 Da), and a very low polydispersity (Mw/Mn = 1.22). Compared to kraft lignin, the pre-hydrolysate lignin has a much lower molecular weight and could be a potential candidate for niche applications. A high lignin recovery rate is possible (52% of the total lignin content in the pre-hydrolysate).

Item Type: Article
Subjects: STM Library > Engineering
Depositing User: Managing Editor
Date Deposited: 04 Feb 2023 05:26
Last Modified: 14 Mar 2024 04:24
URI: http://open.journal4submit.com/id/eprint/269

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