Various objective functions used in optimal control of crystallization

Various objective functions used in optimal control of crystallization [4] 

Drying is often the last separation in a process. Drying refers to removal of water or other solute from solids and often follows evaporation, crystallization, or filtration. Drying is the one of the oldest methods of preservation in the food industry. Drying is often employed to reduce cost of transport, or to have material suitable for handling like in pharmaceutical or soap industries, or in some cases where moisture may cause corrosion. 

Drying processes fall into five categories given below. 

Air or contact drying In air or contact drying, moistnre or other solute is removed from solids by heated air or heated surface. 

Vacuum drying In vacuum drying, the fact that evaporation occurs more readily at lower pressure is used for drying. 

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