الفهرس 
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Abstract
The present study represents an attempt to gain an approximate idea about the kinetics of calcium carbonate dissolution in dilute hydrochloric acid. Variables studied were acid concentration, temperatures, surfact¬ant, concentration and solution flow rate. A batch unstirred reactor and a continuous flow reactor were used to conduct the present study. A. Results obtained using a batch reactor:¬
1. The rate of calcium carbonate dissolution in hydrochloric’ acid (0.01-0.2 M) using a batch unstirred reactor under different conditions fit the equation. In C0 IC = t
2. The rate constant (K) creases almost linearly with hydrochloric acid concentration.
3. The mass transfer coefficient increases with increasing the concentration of the surface active agent (triton x 100).
4. The rate of CaC03 dissolution in HCI increases with increasing solution temperature with an activation energy of 8.9 K cal/mole
B. Results obtained using a continuous flow reactor:¬
1: The mass transfer coefficient of CaC03 dissolution in HCl increases with increasing solution velocity and Reynolds number according to the equations:¬
K=a1 V1.2
and
K = a2 Re1.2
2: The mass transfer coefficient increases with increasing triton concentration. It can be concluded from the present study that dissolution of CaC03 in HCl under the present set of conditions is a diffusion controlled reaction.