Kinetic studies on lime causticization using locally sourced soda
ash and hydrated lime
*Ameh, A.O., Ahmed, A.S.
and Aderemi, B.O.
Department of
Chemical Engineering, Ahmadu Bello University, Zaria.
alewoameh@yahoo.com
Abstract
Lime causticization was
studied to develop the governing rate equation for the reaction.
Under heterogeneous reaction conditions, the reaction was found to
be limited by mass transfer. With thorough mixing
(pseudo-homogeneous reaction) a rate equation was developed at
optimized reaction time. The determining of initial rates method
gave the order of reaction with respect to lime and soda ash to be
1.4 and 1.2 respectively. The overall rate equation was however
found to follow a shift-order model; which indicates product
inhibition characteristics of the reaction:
krCA
rA
=
1+KMrCA
