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INVESTIGATION OF THE LIGNIN HYDROGENOLYSIS PROCESS IN DIFFERENT SOLVENTS

Esther Sulman

Abstract

In this work, we investigated the solvent effect on the process of lignin hydrogenolysis using polymer-based catalyst 3%Ru/HPS. Liquid products of lignin hydrogenolysis process in a variety of solvents include a large number of individual compounds belonging to different classes of organic substances. These products include the substances resulting from the conversion of the solvents, and the typical products of the conversion of lignin (benzene and phenol derivatives). The main derivatives of phenol are methoxyphenols (about 80%). In water yields of phenols and its derivatives were 72% in 2-propanol 47.2% and 4.5% in ethanol. Benzene derivatives in water amounted to 6.2, 8.0 in 2-propanol and 2.1 in ethanol. Other products are ethers and esters, fatty alcohols, acids, aldehydes, ketones, acetals, alkanes, and alkenes. Despite the fact that the total amount of benzene and phenol derivatives was higher for water, 2-propanol is more promising solvent because of the greater conversion. Carrying out the reaction in a 2-propanol medium shown the highest yield of liquid products and a high degree ofconversion, probably because it is thermally unstable and decomposes with theevolution of hydrogen. Lately, this type of hydrogen donor solvents is increasinglybeing used in hydrotreating processes of biomass, including lignin. Maximumconversion of feedstock reaches 67.5% in an environment of 2-propanol and 67% inethanol. The maximum conversion in the water under the same conditions reached only30%. Experiments in supercritical carbon dioxide have also been conducted, but thepresence of a supercritical solvent reduces the yield of benzene and phenol.

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DOI resolver: doi.org/10.5593/sgem2019/4.1/s17.036

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