Overview
ABSTRACT
Crystallization processes are divided into two categories: crystallization from solution and crystallization from melt. This technique presents many advantages such as the solvent free aspect, production of very high purity products, low energy consumption and a higher security level, according to principles of sustainable development. This paper deals with the steps of crystallization process, then batch and continuous processes are presented. At least, the industrial implementation is described as well as solidification processes of melted purified product.
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Read the articleAUTHORS
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Marie LE PAGE MOSTEFA: Senior Lecturer, École Nationale Supérieure des Industries Chimiques / Université de Lorraine – Doctorate in Process and Product Engineering, Université de Lorraine – ENSCR Engineer - Laboratoire Réactions et Génie des Procédés – CNRS UMR 7274 – Nancy – France
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Hervé MUHR: CNRS Research Director – PhD in Process Engineering, Institut National Polytechnique de Lorraine – ENSIC Engineer - Laboratoire Réactions et Génie des Procédés – CNRS UMR 7274 – Nancy – France
INTRODUCTION
Crystallization processes produce solids from liquid or gaseous media. Among these processes, melt crystallization relies on differences in the solid-state physico-chemical properties of the compounds to be separated, just as distillation enables products to be separated based on differences in the evaporation properties of the mixture. Indeed, the principle of melt crystallization relies on cooling an impure liquid mixture to produce a purified crystalline solid phase containing the product of interest.
The advantages of melt crystallization make it an attractive alternative to purification, separation and shaping processes. Compared with distillation, melt crystallization requires little energy. Moreover, since it operates without solvents and at low thermal levels, this process is in line with the trend towards more environmentally-friendly and cost-effective processes. What's more, this purification method is sometimes the only technique capable of separating constituents such as mixtures of isomers or azeotropic mixtures.
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KEYWORDS
purification | separation | forming
Crystallization in molten media
Basic concepts, definitions
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