Purification of N,N-di-2-naphthyl-p-phenylenediamine using a mixed solvent system
AssigneeThe B. F. Goodrich Company
InventorsGeorge Kletecka, Mark E. Forry
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Abstract
Dark colored impurities, 2-aminonaphthalene and 2-naphthol are extracted from crude N,N'-di-2-naphthyl-p-phenylenediamine by contacting with a mixed solvent system comprising (A) at least one compound selected from the group consisting of alkanols and alkanediols and (B) at least one alkylated benzene.
Claims8
A process for purifying crude N,N'-di-2-naphthyl-p-phenylenediamine wherein crude N,N'-di-2-naphthyl-p-phenylenediamine is contacted with a mixed solvent system comprising (A) at least one compound selected from the group consisting of alkanols and alkanediols containing from 1 to 5 carbon atoms, and (B) at least one alkylated benzene having the formula ##SPC3##
- wherein R is hydrogen or an alkyl radical containing 1 to 3 carbon atoms and at least two R's are hydrogen, the weight ratio of A to B is from about 1:1 to about 1:9, and the weight ratio of said mixed solvent system to crude N,N'-di-2-naphthyl-p-phenylenediamine is from about 1:1 to about 10:1.
Dependencies are inferred from the claim text.