The Experimental Study on Thermal Stability of Aqueous Surfactant Solution

Based on the determination of the equilibrium surface tension for anionic surfactant SDS and non-ionic surfactant TrionX-100 and TrionX-114 under different concentrations, the two surfactant continuous boiling test and the SDS for the hydrolysis tests were carried out. Objective is to analyse the variation process for active ingredient of the surfactants. Results show that the liquid with surfactant is capable of reducing the surface tension. With the increment of surfactant concentration, the surface tension decreases gradually, and the surface tension is minimized under the critical micelle concentration(CMC); When the concentration lower than CMC, the surface-active of Triton X-100 presented is stronger than the SDS. At continuous boiling experiment, the thermal stability of Triton X-100 solution is better than the SDS. When the SDS aqueous solution is in the sealed environment with set temperature and the continuous boiling environment under experiment situation, the active ingredients of SDS solution are change and the equilibrium surface tension is undermined. Owing to the chemical losses, the inherent characteristics of solution perform dramatically different from the original one during boiling experiment, which includes the hydrolytic destruction and micro-layer pyrolysis chemical effects.