(under the class definition) Processes directed to separating (1) the atoms of a given element or a compound containing said atoms according to the atomic weights of said atoms according to the atomic weights of said atoms or (2) a mixture containing at least two tautomeric forms of a substance initially in a state of equilibrium.
(1) Note. A mixture of H2O and D2O is an example of a feed mixture containing hydrogen atoms of different atomic weights.
(2) Note. Separating by distillation the ketoenol forms of a compound is within the purview of this subclass.
SEE OR SEARCH CLASS
95, Gas Separation: Processes,
31+, for processes in which a plurality of gases is separated by making use of physical difference in weight.
423, Chemistry of Inorganic Compounds, 580.1, for processes of producing water and subclass 580.2 for processes of producing heavy water including a chemical reaction.
