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. 17, 1996
Filed:
Apr. 20, 1995
Henry Sawatzky, Ottawa, CA;
Noel P Mailvaganam, Orleans, CA;
Ian F Clelland, Renfrew, CA;
Jean Houde, Jr, Gatineau, CA;
Brian A Farnand, Nepean, CA;
Natural Resources Canada, Ottawa, CA;
Abstract
A process is described for preparing a water-soluble sulphonated dispersant from a petroleum hydrocracking residue comprising: contacting a petroleum hydrocracking residue boiling above 524.degree. C. with concentrated sulphuric acid, oleum or sulphur trioxide to form a sulphonated mixture containing water soluble and water insoluble products, and separating the water soluble sulphonated product from the mixture. The mixture of water soluble and water insoluble sulphonated products is neutralized with alkali and evaporated to dryness, after which the dried mixture is extracted with alcohol to leave a water soluble product. The product can be used as a water reducer or superplasticizer in concrete.