Shui Xiangqian
2014
Citations
0
Influential Citations
0
Citations
Journal
Journal of Jiangnan University
Abstract
An amphoteric surfactant,didodecyl methyl hydroxyl propyl sulfobetaine(diC12HSB),was synthesized by reaction of the corresponding tertiary amine with 3-chloro-2-hydroxyl propyl sulfonate in the presence of Na2CO3 and KI with isopropanol /water mixture as solvent at 85 ℃. The molecular structure of the product was confirmed by FT-IR,mass spectrum and1 HNMR respectively. Due to the two long hydrocarbon chains,diC12 HSB is only slightly water soluble but with good solubility in oils. At 25 ℃ diC12 HSB has a high saturated adsorption at air /water interface,7. 0 ×10-10 mol /cm2,and correspondingly a low cross section area,0.237 nm2,with the cmc and γcmcbeing estimated to be1. 8 ×10-5mol /L,and 31 mN /m,respectively,which indicates that diC12 HSB is highly surface active. By mixing with hydrophilic sulfobetaine or hydrophilic carboxyl betaine and nonionic surfactants such as alkanolamide ethoxylates,where diC12 HSB has a molar fraction between 0. 25 and 0. 3,the mixed surfactants can reduce the Daqing crude oil /connate interfacial tension to ultralow,or 10-3mN /m magnitude,in a total surfactant concentration range from0. 01% to 0. 3%,without adding any alkali or neutral electrolyte. diC12 HSB is thus a potential surfactant for surfactant-polymer flooding free of alkali.