The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2012
Filed:
Dec. 04, 2009
Steven W. Levine, Flemington, NJ (US);
Manuel A. Francisco, Phillipsburg, NJ (US);
Sharon A. Feiller, Allentown, PA (US);
Clifford C. Walters, Milford, NJ (US);
Steven W. Levine, Flemington, NJ (US);
Manuel A. Francisco, Phillipsburg, NJ (US);
Sharon A. Feiller, Allentown, PA (US);
Clifford C. Walters, Milford, NJ (US);
ExxonMobil Research and Engineering Company, Annandale, NJ (US);
Abstract
A method for recovering high molecular weight naphthenic tetra-acids, particularly ARN acids from a calcium naphthenate deposit. Calcium naphthenate deposits contain large amounts of calcium naphthenate salts of ARN acids. The method dual solvent extraction process in which the naphthenic tetra-acids chemically bound as calcium naphthenate salts are converted into free acid monomers by an aqueous acid. The resulting free acid monomers are then dissolved into an organic solvent phase and the counterions dissolve in the aqueous acid phase. The naphthenic tetra-acids are then recovered from the organic solvent phase.