Growth rates of boric acid have been measured both in the absence and in the presence of electrical field at 1.00 DC voltage as a function of supersaturation in a laboratory-scale fluidized bed crystallizer at the temperature range of 20°C to 52°C. The values of overall rate coefficient (K_G), diffusion rate coefficient (k_d), reaction rate constant (k_r) and reaction order (r) were determined by trail and error method at different temperatures. In the absence of electrical field increasing the temperature causes to increase the values of K_G, k_d, k_r and r. Activation energies are also determined for K_G, k_r and k_d separately. The effect of electrical field on the crystallization steps were determined by similar route. It was observed that electrical field caused to decrease the values of kinetic parameters (K_G, k_d, k_r and r) by increasing temperature.

Keywords: crystallization, boric acid, electrical field, activation energy, mass transfer coefficient, surface reaction constant, reaction rate order

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