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:
Jul. 11, 1989
Filed:
Apr. 15, 1988
Jeffery W Koepke, La Habra, CA (US);
Wen-Ching Hsieh, Yorba Linda, CA (US);
June M Bostich, Brea, CA (US);
Union Oil Company of California, Los Angeles, CA (US);
Abstract
A petroleum sulfonate is prepared by (a) separately sulfonating each of two or more different petroleum fractions boiling substantially above 700.degree. F. by contact with sulfur trioxide under reaction conditions wherein the ratio of milliliters of sulfur trioxide to grams of aromatic components is adjusted so as to produce from each separate fraction a reaction product capable of producing upon neutralization a sulfonate having a sulfonate requirement in microemulsion below about 20 grams per 100 milliliters of microemulsion; (b) separately neutralizing the sulfonated fractions; and (c) blending the hydrocarbon sulfonates produced from two or more of the fractions in proportions sufficient to yield a product petroleum sulfonate blend useful for enhanced oil recovery. In one embodiment four different petroleum fractions are separately sulfonated using different ratios of sulfur trioxide to aromatic content for each fraction and the sulfonated fractions are blended in a weight ratio between 0:1:1:0 and 1:10:10:1 to yield a sulfonate blend useful for enhanced oil recovery.