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:
Sep. 19, 1989
Filed:
Aug. 26, 1988
Mack W Hunt, Naperville, IL (US);
Amoco Corporation, Chicago, IL (US);
Abstract
A method of preparing a carbonate overbased alkali metal sulfonate, which method comprises: (1) forming a reaction mixture of an alkali metal compound, a lower molecular weight akanol having from 1 to 4 carbon atoms, a diluent, a solvent, and a sulfonate compound; (2) heating said reaction mixture to a temperature of a least 140.degree. C. (220.degree. F.) for a period of time that is sufficient to remove essentially all of said alakanol as overhead and to obtain a heated mixture and replacing the solvent that is removed along with said alkanol; (3) carbonating said heated mixture at a temperature of at least 140.degree. C. (220.degree. F.) to form a carbonated product comprising said overbased alkali metal sulfonate while removing water of reaction as overhead as it is formed; (4) after carbonation, heating said carbonated product to a temperature that is within the range of about 116.degree.0 C. (240.degree. F.) to about 117.degree. C. (350.degree. F.) to remove any residula water of reaction therefrom; and (5) subsequently treating said carbonated product to remove solids and residual solvent therefrom.