Seeding of DTB and Oslo crystallizers

Additional measures are required to continuously produce these coarse crystallized masses [5]. This applies to both basic types of coarse grain crystallizers, the DTB and the fluidized bed crystallizer. It is indeed observed that in the case of coarse grain crystallizers with fines dissolving the mean crystal size of the discharged product can become subject to cyclical fluctuations beyond an average crystal size of about 2 mm. This results from the fact that the effective nucleation BefF. which is the sum total of 

This behavior of the coarse grain crystallizers is undesirable because the sales returns for the coarse crystallized masses often exceed by a multiple the yields for finally crystallized masses at the fines end of such a cyclical fluctuation. Through 

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