GENERAL STATEMENT OF CLASS SUBJECT MATTER
This is the residual class for processes for separating a liquidmixture (distilland) by vaporizing and condensing at least a portionthereof to isolate in the condensed liquid (distillate) or in theunvaporized portion (residue) a comparatively pure compound whichwas present as such in the original mixture. The original mixturemay be a solid under normal atmospheric conditions if it liquifiesbelow the vaporization temperature.
To come within the purview of this class (203) the distillandmust have a boiling point above 0°C. under normal atmosphericpressure. Because the C4 hydrocarbons have boiling points aboveand below 0°C., all C4 hydrocarbons are arbitrarily classifiedas having boiling points above 0°C.
Sublimination (see Glossary) is excluded from this class (203).See References to Other Classes, below.
When claims are presented which recite a specific chemicalcompound or mixture to be recovered, the enumerated classificationsset forth in Lines With Other Classes must be consulted to see ifsuch subject matter is provided for in other than Class 203.