KINETICS OF GLYCEROL ACETYLATION WITH ACETIC ACID IN THE PRESENCE OF NATURAL ALUMOSILICATES MODIFIED WITH ARENESULFONIC ACID FRAGMENTS
DOI:
https://doi.org/10.15421/jchemtech.v33i2.322096Keywords:
glycerol, acetylation, alumosilicates, acetins, kinetics, catalysisAbstract
The kinetics of glycerol acetylation with acetic acid in the presence of natural aluminosilicates of the domestic deposit modified with arenesulfonic acid fragments, namely: bentonite, clinoptilolite and trepel, were studied. It was found that the selectivity of products depends on nature of catalyst and the reaction conditions, instead, in the presence of samples modified with nitric acid (H-samples), the main product is monoacetin. The main factors that allow regulating the activity of such catalysts and the efficiency of acetylation process are established. For example, the studied reaction refers to the processes of self-catalysis and in this case the molecule of acetic acid appear as a reactant and as a catalyst. The conversion of glycerol reaches 80 % and the main product is monoacetin (>60 %). Therefore, the main function of the catalyst in this reaction is to increase the selectivity of di- and triacetin. Regardless of the catalysts mass fraction, the glycerol conversion doesn´t change (~100 %), but changes depending on the reaction temperature and the mole ratio of reactants. According to their catalytic activity, the studied catalysts can be placed in following order: AS-Bent > AS-Tr > AS-CLI.
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