4. Evaporators

The horizontal tube evaporator is the only type of chemical evaporator in which the heating medium is inside the tubes.

The major use of this type of evaporator is for making distilled water for boiler feed.

This type has smaller capacity than other evaporators.

The principal advantage of horizontal tube evaporators lies in the relatively small headroom they require.

The horizontal evaporator is least satisfactory for fluids that form scale or deposit salt (which would build up on the outside of the tube).

It is well-suited for processes where the final product is a liquid instead of a solid, such as sugar syrups where the large volume of liquid stored in the evaporator allows a close adjustment of the final density by changing the hold-up in the evaporator.