Purification of (hydrocarbylthio) aromatic amines
AssigneeEthyl Corporation
InventorChristopher J. Nalepa
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Abstract
A (hydrocarbylthio)aromatic amine, such as a methylthiosubstituted toluenediamine, is separated from corresponding aromatic amines containing fewer hydrocarbylthio groups by washing an organic solution of the amine mixture with a dilute aqueous acid having a pKa value below 7 to extract at least a portion of the corresponding aromatic amines.
Claims8
A process which comprises washing an organic solution of a (hydrocarbylthio)aromatic amine which is an admixture with at least one corresponding aromatic amine containing fewer hydrocarbylthio groups with a dilute aqueous acid having a pKa value below 7 to extract at least a portion of the corresponding aromatic amine.
Dependencies are inferred from the claim text.