温度对高浓度SDS水溶液泡沫稳定性及分离的影响

高浓度表面活性物质的分离是泡沫分离过程的难题,也是制约泡沫分离技术应用于工业化生产的瓶颈.为了解决高浓度表面活性物质泡沫分离的难题,以阴离子表面活性剂十二烷基硫酸钠(SDS)水溶液为体系,研究了在其临界胶束浓度(CMC)附近时,温度对SDS水溶液气泡直径、泡沫稳定性、富集比及回收率的影响.结果表明:温度对高浓度表面活性物质的泡沫分离有显著影响.当SDS水溶液浓度分别为1.2、2.3、3.5g·L-1,温度从30℃升高到70℃时,泡沫稳定性先增大后减小,在pH 6.9、表观气速2.4×10-3 m·s-1、装液量200 mL的操作条件下,气泡直径先减小后增大,富集比提高了3～5倍,回收率降低了34％～65％.

Effects of Temperature on Foam Stability and Separation Efficiencies of Foam Formed by High Concentration SDS Aqueous Solution during Foam Separation

Separating high concentration surfactant by foam separation is a difficult problem,which is also the bottleneck that constrains the application of foam separation technology to industrialization.In order to resolve this difficult problem,anionic surfactant sodium dodecyl sulfate(SDS) was used as the model system,and the effects of temperature on bubble diameter,foam stability,enrichment ratio and recovery percentage were investigated around the critical micelle concentration(CMC) of SDS.The results show that the temperature is an important parameter for separating high concentration surfactant by foam separation.When the concentrations of SDS aqueous solution are 1.2,2.3,3.5 g·L-1,respectively,with increasing temperature from 30 to 70℃,foam stability initially increases and then decreases,at the same time under the conditions of pH 6.9,and superficial air flow rate 2.4×10-3 m·s-1,the bubble diameter firstly decreases and then increases,the enrichment ratio increases by 3~5 times,and the recovery percentage decreases by 34%-65%.