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Overall crystal growth kinetics for ammonium nitrate crystals in a laboratory scale draft tube baffled agitated Crystallizer have been determined from the batch experiments performed in the integral mode. The effects of supersaturation, temperature, crystal slze, slurry voidage, stirrer speed, and impurity were investigated. Three different methods, viz. polynomial fltting, initial derivatives, and optimization procedures, in general gave comparable results for the growth kinetics. I n a conventional method using the polynomial fitting of desupersaturation curves the order of growth process was about 0.75 and activation energy about 25 kJ/mol. Growth rates in the present study appear to have significant bulk diffusion contribution.

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A lemary rolid-llqukl dlagram of the ryrtem p c r e d , 2,6xyknd, and f.ri-bulyl alcohol b prepared. f i -B u l y i alcohol can be used as an extraneous agent for the uparatlon of p-crerd from ilr mlxture with 2,6xylenoi by adductlve cryrtallltallon in a muilktage process, both of these compounds being close-boiling componenls of the mlxture.

No abstract