SDBS/TTAC混合表面活性剂双水相体系性质的研究

研究了十四烷基三甲基氯化铵(TTAC)和十二烷基苯磺酸钠(SDBS)混合表面活性剂水溶液双水相体系的性质,测定了分相区域并绘制了相图,以色氨酸为对象研究了双水相体系的萃取作用。实验结果表明,20~40℃,n(SDBS)∶n(TTAC)=(1.6∶1)~(1∶4)可以形成双水相;TTAC过量区双水相上下相体积比随TTAC摩尔分数的增大而减小,加入正丁醇后分相速度加快,可在12 m in内分相,上下相体积比增大;电导率曲线与偏光显微镜图片表明,TTAC过量区双水相下相存在松散的液晶结构。该文报道工作的新颖性已为科学技术部西南信息中心查新中心2007年8月16日出具的第J 20071385号《科技查新报告》所证实。

Study of Aqueous Two-phase System of SDBS/TTAC Mixed Surfactants

Influence of temperature,total concentration and molar ratio on the aqueous two-phase system of sodium dodecylbenzene sulfonate(SDBS) and tetradecyltrimethylammnium chloride(TTAC) was investigated and the ternary phase diagram of the SDBS/TTAC/H2O system was determined.Extraction of L-tryptophan by this system was also studied.The results show that the aqueous two-phase system can be formed with n(SDBS)∶n(TTAC)=(1.6∶1)～(1∶4) at 20～40 ℃.The volume ratio of upper/lower phases decreases when TTAC molar ratio increases in the TTAC excessive region.The phase separation time decreases(in 12 min)and the volume ratio of upper/lower phases increases when n-butanol was added.The curve of conductance and the polarizing optical microscope photograph indicate that there is liquid crystal in the lower phase of the TTAC excessive region.This work has been confirmed to be innovative by the Southwest Information Center of Ministry of Science and Technology in《Certificate of New Technology Information Search》J 20071385 on August 16,2007.