Process for inhibiting oxidation and polymerization of furfural and its derivatives
AssigneeExxon Chemical Patents Inc.
InventorGhazi Dickakian
Life of this patent
Estimating the term…
Abstract
Dialkylphenylenediamines are used to inhibit oxidation and polymerization of furfural or furfural derivatives. The preferred use of the inhibitor is in the solvent refining of lubricating oils using furfural to extract constituents from the lubricating oils.
Claims14
A method of inhibiting oxidation of furfural which comprises the steps of (a) adjusting the pH of the furfural to between 6.6 and 7.2, and (b) introducing into the furfural an effective amount of an inhibitor selected from the group consisting of dialkylphenylenediamines, diarylphenylenediamines, dialkylnaphthalenediamines, and diarylnaphthalenediamines.
In the solvent refining of lubricating oils wherein a continuously circulating furfural stream is brought into contact with lubricating oil to extract constituents therefrom, a process for inhibiting oxidation of the furfural which comprises (a) adjusting the pH of the furfural stream to between 6.6 and 7.2 and (b) injecting into the stream an effective amount of a dialkylphenylenediamine to inhibit the oxidation of the furfural.
Dependencies are inferred from the claim text.