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Comment PDF Separation Processes

A Clearer View Of Crystallizers

By Wayne Genck,  Genck International |

Crystallization is a key purification technique for various sectors of the chemical process industries (CPI). Several approaches for industrial crystallization have evolved over time, and highly specialized crystallizer designs have been developed, especially in long-established industries. Solution crystallization is an important unit operation because the process can generate high-purity products from solutions containing significant levels of impurities with relatively low energy input. This article is intended to expand knowledge of the various crystallizer configurations, including forced circulation (FC) and draft-tube-baffle (DTB) configurations, which will be discussed in detail.  Classification of crystallizers Two schemes have been employed to classify crystallization equipment. One uses the method of generating supersaturation, while the other scheme uses the method by which the growing crystals are suspended. There are six primary methods for generating supersaturation: evaporation, cooling, adiabatic-flash (vacuum) cooling, chemical reaction, antisolvent addition and pH adjustment. However, classification according to the method of generating supersaturation is not entirely satisfactory, since different means of generating…
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