Surfactant, process for its production and use

US5523470A · kind A · utility

Assignees

• Berol Nobel AB · SE
• Den Norske Stats Oljeselskap A.S. · NO

Inventors

• Leif Karlsson · Vänersborg, SE
• Per Hellberg · Svenshögen, SE
• Lena Eriksson · Stenungsund, SE
• Stig Svennberg · Stenungsund, SE
• Eimund Gilje · Oltedal, NO
• Siri Espedal · Stavanger, NO
• Trygve Maldal · Sola, NO

Key dates

• Filing date: Apr 5, 1994
• Grant date: Jun 4, 1996
• Expiry date: Apr 5, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A new class of surfactants exhibits properties, which make the surfactants suitable for use in surfactant flooding for enhanced oil recovery. The surfactants have the formula EQU XA.sub.r ORSO.sub.3.sup.- M.sup.+ (I) where R is a hydrocarbon or hydroxyl-substituted hydrocarbon group with 2-6 carbon atoms; A is an oxyalkylene group having 2-4 carbon atoms; r is a number from 0-10, preferably 0-5 and most preferably 1-4; X is an hydroxyl group or hydroxyl and ether group containing hydrophobic group, which comprises 2-6, preferably 2-4 end groups containing 3-22 carbon atoms; and M is a cation, preferably a monovalent cation; or a C.sub.1-4 -alkyl ether thereof. A method for the manufacture of the surfactants are also enclosed.