Abstract
This study presents an efficient and controlled catalytic valorization of a real side product of the agroforestry industry,i.e., sodium lignosulfonate (LS), in a continuous flow system to either monomers or oligomers.
Highlights
lignocellulosic biomass (LCB) is industrially processed on the Gt scale per year, and about 4 Gt of wood products are made every year, with about 1 Gt ending in pulp and paper factories.[16,17]
The LS was found to contain 7.0 wt% of sulfur (Table 1). This S content is comparable to the reported industrial sulfite process by Borregaard.[21,43]
Na was found to be the major sulfonate counter ion with 10 wt%, combined with the presence of Ca and Mg traces (Table 1). The presence of these Ca and Mg ions points to the usage of mixed sulfite salts
Summary
In the last few centuries, extensive exploitation of fossil resources has led to the current global environmental challenges that we are facing.[1,2,3,4] A transition toward more sustainable and renewable resources and production processes for energy and commodities is in great demand.[5,6,7,8,9,10,11] Among the renewable resources, lignocellulosic biomass (LCB) is one of the most promising feedstock since it is abundant, cheap, and intrinsically sustainable as it is produced via photosynthesis by plants.[12,13,14] LCB is a complex solid composite, made of three biopolymers: cellulose, hemicellulose, and lignin.[13,15,16] Currently, LCB is industrially processed on the Gt scale per year, and about 4 Gt of wood products are made every year, with about 1 Gt ending in pulp and paper factories.[16,17] Within the scope of the current article, it is important to note that only the sugar fractions are valorized, e.g. as pulp.
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