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Comment PDF Solids Handling

Industrial Crystallization for the CPI

By Michel Malfand |

This overview presents the traditional and emerging types of continuous crystallizers Crystallization is an important technique for the purification of solids in the chemical process industries (CPI). The operation can be performed batchwise or in continuous operation, and is used for a wide variety of products, ranging from sugar, salts and other bulk chemicals, to pharmaceuticals and other fine chemicals. This article provides an overview of the most important types of continuous crystallizers, with a brief summary of the pros and cons of each type.   Generating supersaturation Crystallization from solution is done by creating a supersaturated solution of the product in the solvent. Creating the supersaturation condition can be achieved by any (or a combination) of the following methods: Evaporation Cooling (adiabatic) Cooling (surface) Cooling (by gas injection) Reactive Anti-solvent addition pH adjustment   Types of crystallizers For continuous operation, the main crystallizers in operation in the CPI include the following (for more details, see Ref. 1–4): Forced circulation (FC) Draft tube baffle (DTB) Oslo Indirect forced circulation (IFC) Forced circulation (FC). An FC crystallizer (Figure…
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