Esterification of acetic acid with n-butanol over manganese nodule leached residue

Manganese nodule leached residue (MNLR) was obtained as waste material after selective extraction of Cu, Co and Ni from Indian Ocean manganese nodule. MNLR was washed with water to remove sulphate and other impurities present in its surface. The catalytic activity of the waste material was tested for liquid phase esterification of acetic acid with n-butanol. The effect of reaction time, catalyst amount, temperature and mole ratio of reactants on esterification was studied to optimize the reaction conditions. Water-washed manganese nodule leached residue (WMNLR) calcined at 400 °C shows highest catalytic activity with 76.6% conversion having 100% selectivity towards n-butyl acetate. Esterification reaction follows first order kinetics with respect to acid and 0th order with respect to n-butanol. Conversion of C1–C4 aliphatic acids with n-butanol follows the following order: formic > acetic > proponoic > n-butyric.

Manganese nodule leached residue (MNLR) a solid waste after selective extraction of Cu, Co and Ni from Indian Ocean manganese nodule and washed with water to remove sulphate and other impurities present in its surface. The catalytic activity of the waste material was tested for liquid phase esterification of acetic acid with n-butanol. Water-washed leached residue calcined at 400 °C shows highest catalytic activity with 76.6% conversion and 100% selectivity for n-butyl acetate. A gradual rise in the conversion was seen with increase in duration of the reaction period. As seen from the above figure, 4 h of reaction time completes 76.6% of the reaction where as at the end of 7 h only 80% of the reaction is complete. The selectivity towards n-butyl acetate on the other hand remains same, i.e. 100% at 7 h. Figure optionsDownload as PowerPoint slide