高分子醇醚羧酸盐表面活性剂活性物含量的测定  

Determination of high-molecular-weight fatty alcohol polyoxypropylene-polyoxyethylene ether carboxylates

作　　者：冉立君 陈琪 陈钊 崔正刚 Lijun Ran;Qi Chen;Zhao Chen;Zhenggang Cui(The Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical&Material Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China)

机构地区：[1]江南大学化学与材料工程学院,合成与生物胶体教育部重点实验室,江苏无锡214122

出　　处：《日用化学工业》2022年第4期345-354,共10页China Surfactant Detergent & Cosmetics

基　　金：国家自然科学基金(青基)资助项目(22002049)。

摘　　要：高分子醇醚羧酸盐具有优良的耐温耐盐性能,是理想的三次采油用表面活性剂。然而其定量分析仍是一个难题,例如采用溴甲酚绿指示剂两相滴定法所得结果严重偏低,从而给相关产品的质量控制、配方研制等带来困难。本文在系统考察了溴甲酚绿指示剂两相滴定法对羧酸盐类表面活性剂适用性的基础上,提出了改进的比色法。以具体产品的纯化产物作为基准物,以海明1622作为阳离子表面活性剂,溴甲酚绿作为显色剂,氯仿作为颜色萃取剂,通过两相萃取并测定氯仿相的吸光度,得到了线性关系优良的标准曲线,进而能够定量测定合成产品中醇醚羧酸盐的含量和转化率,灵敏度达到10^(-6) mol/L数量级,回收率达到97%以上。Fatty alcohol polyoxypropylene(PO)-polyoxyethylene(EO)ether carboxylates(APEC)with relatively large molecular weight(1500~3000)are excellent surfactants for enhanced oil recovery due to their good tolerance to high temperature and high salinity.However,the quantitative analysis of this type of surfactants is still a problem.For example,using the typical two-phase titration in alkaline media with bromcresol green as indicator gives significantly underestimated results.The lack of an accurate and precise analytic method has brought difficulty to relevant formulation and quality control in industrial production.Herein,the applicability of the typicaltwo-phase titration method in alkaline media with bromcresol green as indicator to the high-molecular-weight APEC was examined and a new method based on colorimetry was proposed.For the high-molecular-weight APEC synthesized,a linear calibration curve indicative of the relationship between the surfactant concentration in aqueous phase and the absorbance of chloroform phase at 630 nm equilibrated with the aqueous phase after two-phase extraction could be obtained,in which the purified product was used as standard sample,Hyamine 1622 was used as cationic surfactant,bromcresol green was used as indicator,and chloroform was used as extraction agent of the color.By these means,the content of APEC in industrial products can be determined and the conversion can also be obtained.Specifically,the minimum concentration detectable of the APEC in aqueous phase can be as low as 10^(-6) mol/L,and the recovery can be higher than 97%.

关 键 词：醇醚羧酸盐 两相滴定 溴甲酚绿指示剂 比色法 三次采油 

分 类 号：TQ423[化学工程]