Surfactants are very often used in tertiary oil production. However, the conventional surfactants cannot be used in high salinity reservoirs of tertiary oil production because the high salinity leads to the deactivation of the surfactants. Gemini sulpho-betaine surfactants have been developed to meet the requirements of tertiary oil production in such reservoirs. In this study, the Gemini sulphobetaine surfactant (bis{[(N-methyl-N-(3-alkoxy-2-hydroxy)propyl-N-(3-sulfonate)propyl]methylene}) was prepared by etherification, ring opening reaction and sulfonation reaction with decyl alcohol, epichlorohydrin, N,N’-dimethyl ethylene diamine and 1,3-propanesultone. The experimental conditions obtained are: the ratio of 1,3-propanesulfonic acid lactone to tertiary amine intermediate = 2.3 : 1, reaction temperature = 70°C and reaction time = 11 h. The analysis of the infrared spectrum showed that the structure of the synthesised substance corresponds to that of a Gemini sulphobetaine surfactant. The chemical shifts of the groups were determined by 1HNMR structural characterisation of the products. The surface tension, emulsifying properties, foaming properties and wetting properties were investigated. The results showed that the surfactant has good foaming properties and good compatibility in a high salt environment.

中文翻译：

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Gemini磺基甜菜碱表面活性剂双{[(N-甲基-N-(3-烷氧基-2-羟基)丙基-N-(3-磺酸)丙基]亚甲基}的制备及性能评价

表面活性剂经常用于三次油生产。然而，传统的表面活性剂不能用于三次采油的高盐度油藏，因为高盐度会导致表面活性剂失活。Gemini 磺基甜菜碱表面活性剂已被开发以满足在此类油藏中三次采油的要求。本研究通过醚化、开环反应制备了 Gemini 磺基甜菜碱表面活性剂（双{[(N-甲基-N-(3-烷氧基-2-羟基)丙基-N-(3-磺酸盐)丙基]亚甲基})与癸醇、表氯醇、N,N'-二甲基乙二胺和1,3-丙磺酸内酯进行磺化反应，得到的实验条件为：1,3-丙磺酸内酯与叔胺中间体的比例=2.3:1，反应温度 = 70°C，反应时间 = 11 小时。红外光谱分析表明，合成物质的结构与 Gemini 磺基甜菜碱表面活性剂的结构相对应。基团的化学位移由下式确定1产物的HNMR结构表征。研究了表面张力、乳化性能、发泡性能和润湿性能。结果表明，该表面活性剂在高盐环境中具有良好的起泡性和良好的相容性。