US PATENT SUBCLASS 203 / 92
.~ Including the addition of water or steam

Current as of: June, 1999
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203 /   HD   DISTILLATION: PROCESSES, SEPARATORY

91  DF  VAPORIZATION ZONE UNDER POSITIVE PRESSURE OR VACUUM {2}
92.~ Including the addition of water or steam {1}
93  DF  .~.~> And returning product of distillation step to distillation zone

DEFINITION

Classification: 203/92

(under subclass 91) Processes directed to adding water or steam to the 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.