Kinetic data obtained from acid demineralization (using 1.25 N hydrochloric acid solution) of
deproteinized exoskeleton of shrimp was fitted to the shrinking core models for heterogeneous
reactions. The element of interest was calcium which was the most abundant element in the
deproteinized shrimp (66.27%) and the mostly affected by the demineralization. Experimental kinetic
data was fitted to the shrinking core model for fluid-particle reactions. Chemical reaction controlled
mechanism gave the best predictive model, as depicted by the fit (R2 = 0.92), with a time of complete
reaction of 3 h.