Kinetic models of candle shell alkaline hydrolysis in obtaining oxalic acid

Siswanto
Wahyusi, Kindriari Nurma
Panjaitan, Renova
Nurmawati, Ardika
Najakha, Ellen Oktavia Hanim

International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Vol. 3 No. 1 (2022): IJEISE

The kinetic reaction of alkaline hydrolysis of candlenut shells to produce oxalic acid was investigated. It was performed for the non-catalyzed solid-liquid heterogeneous reaction in a range time of 30 to 90 minutes and temperature of 60oC to 90oC. This study showed that the reaction fitted the pseudo-first-order model, confirmed from the determinant coefficient value of 0.9182 to 0.9751, and the kinetic constant, evaluated using Arrhenius' law, was k= 0.034751 e^(-140.23⁄T). The rate control mechanism based on the shrinking core model was diffusion control, validated from determinant coefficient near one, from 0.9246 to 0.9766.