Studies on the Synthesis and Application Properties of a Betaine Surfactant with a Benzene Ring Structure

Two novel betaine surfactants with distinct hydrophilic headgroups were synthesized, including carboxybetaine surfactant (DCB) and sulfobetaine (DSB). Their properties of reducing the interfacial tension (IFT) Xinjiang crude oil/water studied under alkaline-free conditions, as their thermal stability, wettability, emulsification properties. The chemical structures target products characterized analyzed by using 1H-NMR 13C-NMR. experimental results indicate that introduction a benzene ring to hydrophobic group can improve solubility high-temperature resistance surfactant. Thermogravimetric analysis showed degradation temperature synthesized was above 190 °C. As concentration solution increased, DSB (0.0750 mmol/L) lower critical micelle (CMC) than DCB (0.1852 mmol/L). wetting ability significantly higher DSB, contact angles on paraffin film decreased 28.36° 35.26°. In addition, both reduce IFT ultra-low levels (10−3 mN/m) in absence alkali. appropriate ion has synergistic effect three ions follows: Na+ < Ca2+ Mg2+.