Back to results
US 11,512,045 B2Granted
Synthesis and evaluation of novel amido-amine cationic gemini surfactants containing flexible and rigid spacers
AssigneeKing Fahd University of Petroleum and Minerals
InventorsSyed M. Shakil Hussain, Muhammad Shahzad Kamal, Abdullah S. Sultan
Life of this patent
Estimating the term…
Abstract
The invention concerns synthesized amido-amine-based cationic gemini surfactants with flexible and rigid spacers and different hydrophobic. These gemini surfactants were prepared by modified procedure through amidation of long chain carboxylic acids using 3-(dimethylamino)-1-propylamine followed by treatment with halohydrocarbons and showed excellent thermal stability and surface properties useful for various oilfield applications such as enhanced oil recovery.
Claims20
A gemini surfactant, comprising:
- an anion part having a combined charge of −2;
- and
- a cation part having a struture (I);
- wherein
- R1 and R2 are C8-C30 alkyl or C10-C30 alkenyl,
- S is a linear C9 alkyl spacer, C4 alkenyl spacer, C6 alkenyl spacer, or C8 alkenyl spacer, and
- n and n′ are in a range of from 2 to 5, or
- a compound of formula (5) or (6)
5 more elements
Dependencies are inferred from the claim text.