Synthesis and Characterization of Multifunctional Surfactants in Oil-Field Protection Applications

摘要

A series of cationic surfactants was prepared using economical raw materials.The chemical structures of the prepared compounds were confirmed using elemental analysis,FTIR and 1H-NMR spectra,and melting point determination.The synthesized surfactants were evaluated as oil-field protective additives.In this regard,several surface properties of the synthesized surfactants were studied including surface tension,critical micelle concen tration,effectiveness,efficiency,maximum surface excess and minimum surface area.The results obtained from the surface activity measurements were correlated to their chemical structures.The emulsification power measure ments for solutions of these surfactants showed their low emulsifying tendency towards paraffin and crude oil.The synthesized surfactants also exhibited high biocidal activity towards gram-positive and gram-negative bacteria and fungi.This activity was increased by increasing the hydrophobic chain length.The corrosion inhibition mea surement of these surfactants for mild steel alloys in acidic media using a weight loss technique showed good protec tion of mild steel alloys against acidic environments.These properties qualify the synthesized compounds as econom ical oil-field protective additives.