Standiford, Ferris C. W. L. Badger Associates, Inc. Consulting Engineers, Ann Arbor, Michigan.
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A device used to vaporize part or all of the solvent from a solution. The valuable product is usually either a solid or a concentrated solution of the solute. If a solid, the heat required for evaporation of the solvent must have been supplied to a suspension of the solid in the solution; otherwise the device would be classed as a drier. The vaporized solvent may be made up of several volatile components, but if any separation of these components is effected, the device is properly classed as a still or distillation column. When the valuable product is the vaporized solvent, an evaporator is sometimes mislabeled as a still, such as a water still, and sometimes is properly labeled, such as a boiler-feedwater evaporator. In the great majority of evaporator installations, water is the solvent that is removed. See also: Drying
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