A Study on Crystallization of Oxalic Acid in Batch Cooling Crystallizer

C. Srinivasakannan, R. Vasanthakumar, K. Iyappan and P. G. Rao

Abstract
A study on batch cooling crystallizer, to assess the effects of various cooling modes on the crystal size distribution, is attempted for oxalic acid. The linear cooling mode is found to give narrow crystal size distribution and higher crystal size as compared to controlled cooling modes. The effect of various operating quantities such as the seed ratio, type of agitator, agitation rates, are carried out with linear cooling mode. The increase in seed ratio is found to reduce the mean crystal size. For turbine type agitator, increase in the agitation rate beyond 140 rpm is found to widen the crystal size distribution and lower the mean crystal size, where as for anchor type agitator, agitation rate beyond 100 rpm is found to decrease mean crystal size.

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Keywords
Batch crystallization, oxalic acid, crystal size distribution