STUDYING THE ACETYLATION PROCESSOF SULFATE LIGNIN IN THE “THIONYL CHLORIDE - TOLUENE - SULFURIC ACID” ENVIRONMENT
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DOI:
https://doi.org/10.25712/ASTU.2072-8921.2022.4.2.018Keywords:
lignin structural units, lignin modification, acylation, acetylation,quantum-chemical calculation, acylating mixture, dimeric structures.Abstract
Lignin is the second most common existing biopolymer. However, its complex network, irregular structure, and complicated composition significantly limit the application scope of this material. One of the options is acylation - the introduction of an acyl group of carboxylic acids (in particular, acetic acid) into lignin macromolecules. We believe this option allows obtaining products with a given set of properties: thermoplasticity, adsorption activity, biological activity, etc. The paper considered the following aspects of the acylation/acetylation reaction: (1) proposed a quantum-chemical substantiation of whether the process is possible; (2) checked the possibility of conducting the process on model compounds; (3) examined the obtaining of acetylated products of sulfate lignin. We also determined the optimal conditions for the process and confirmed the structure of the obtained products.
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