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:
Mar. 10, 1992
Filed:
Dec. 21, 1990
Applicant:
Inventor:
Lawrence R Morrow, Richmond, TX (US);
Assignee:
Texaco Inc., White Plains, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166274 ; 166275 ; 252-8554 ;
Abstract
The invention is a method of producing water soluble surfactants from lignin, which comprises alkylating lignin at phenolic oxygen sites with an alkyl chain having about 3 to about 24 carbon atoms, sulfonating the alkylated lignin, and oxidizing the alkylated, sulfonated lignin sufficiently to break the lignin into smaller polymeric and monomeric compounds having water soluble surfactant properties. The invention also includes using these alkylated, sulfonated, oxidized lignin surfactants in surfactant floods for enhanced oil recovery.