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:
Aug. 03, 1993
Filed:
Jul. 09, 1992
David G Comer, Sugar Land, TX (US);
Sherri L Fisher, Sugar Land, TX (US);
Nalco Chemical Company, Naperville, IL (US);
Abstract
A method is disclosed for dispersing gums in hydrocarbon streams, particularly low molecular weight, sticky polymeric materials formed in refinery and petrochemical plant operation. The dispersant comprises a free radically polymerized copolymer of an .alpha.-olefin of from about 10 to about 36 carbon atoms and maleic anhydride wherein the anhydride moieties along the copolymer backbone are substantially unhydrolyzed. The copolymer has a ratio of olefin to maleic anhydride of from about 1 to about 0.5 and a molecular weight of from 5000 to about 100,000. The dispersant alternatively comprises a dispersant mixture wherein the first component comprises the .alpha.-olefin/maleic anhydride copolymer and the second component comprises an alkyl substituted phenol/formaldehyde liquid polymer, such as nonyl phenol/formaldehyde polymer, or a lipophilic/hydrophilic vinylic polymer, such as hydroxyethyl methacrylate/lauryl acrylate copolymer. Also disclosed is a hydrocarbon dispersion made by the method.