الفهرس | Only 14 pages are availabe for public view |
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. |