.~ One a distillation under positive pressure or vacuum {4}
79
.~.~ Including the addition of water or steam
DEFINITION
Classification: 203/79
(under subclass 73) Processes directed to adding water or steam to at least one distillation operation.
(1) Note. Water or steam is usually added to the distillation operation to change the relative volatility of the components of the material being distilled.
SEE OR SEARCH THIS CLASS, SUBCLASS:
95+, for a single distillation process in which water is added and under subclass 95, see "SEARCH CLASS" for related fields of search.
