The stability of the anionic form of carboxylic acid is lower than that of the non-anionic form [31]. The decarboxylation of the anionic form is faster than that of the molecular form. The addition of alkali hydroxide can promote the dissociation of R-COOH into R-COO− and H+ [32]. In the current study, the addition of NaOH increased the yield of alkanes but reduced the ester yield. One rational explanation may be that the addition of NaOH enhanced the dissociation of fatty acid into anionic form. Then the decarboxylation of fatty acid, producing alkanes, was improved and the esterification reactions between fatty acid and ethanol, forming esters, were relatively weakened. Watanabe et al. studied the decomposition of stearic acid (C17H35COOH) under supercritical conditions and found that the addition of NaOH could accelerate the
decomposition process, and higher yields of alkanes were obtained [33].
The stability of the anionic form of carboxylic acid is lower than that of the non-anionic form [31]. The decarboxylation of the anionic form is faster than that of the molecular form. The addition of alkali hydroxide can promote the dissociation of R-COOH into R-COO− and H+ [32]. In the current study, the addition of NaOH increased the yield of alkanes but reduced the ester yield. One rational explanation may be that the addition of NaOH enhanced the dissociation of fatty acid into anionic form. Then the decarboxylation of fatty acid, producing alkanes, was improved and the esterification reactions between fatty acid and ethanol, forming esters, were relatively weakened. Watanabe et al. studied the decomposition of stearic acid (C17H35COOH) under supercritical conditions and found that the addition of NaOH could accelerate thedecomposition process, and higher yields of alkanes were obtained [33].
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