基于Pickering乳液介质萃取苯胺的研究

以Pickering乳液为介质,研究了苯胺的静态和动态萃取过程.考察了乳液用量、氧化镁粒子用量和萃取级数对静态萃取效率的影响作用,以及苯胺进水浓度、乳液用量和进水流速对动态萃取过程的影响作用.结果表明,在静态条件下,乳液单级萃取苯胺的效率为70％,三级萃取效率超过98％.随着Pickering乳液的用量和萃取级数的增加,静态萃取效率提高:随着MgO粒子用量的增大,静态萃取效率呈现先提高后减小的变化趋势.苯胺的动态萃取行为与固定床吸附过程类似,随着乳液用量增加、进水流速减小和进水浓度的减小,出水保持较低浓度(萃取效率高于99％)的时间延长,相应的穿透时间也增长.该研究方法为萃取工艺开辟了新的思路,还可用于中草药有效成分提取、污水处理等分离过程.

Study on the Aniline Extraction Process Based on Pickering Emulsion Medium

The static and dynamic extraction of aniline from aqueous solution was carried out with the Pickering emulsions as extraction media.The effects of the volume amount of emulsions,the amount of MgO particles and the extraction stages on the static extraction efficiency were investigated.The influences of the influent rate,the inlet concentration of aniline,and the amount of emulsion on the efficiency of the dynamic extraction were also investigated.The results show that the static extraction efficiency of single-stage is 70%,while that of three-stages exceeds 98%.With the increase of the volume amount of the Pickering emulsions and the extraction stages,the static extraction efficiency increases.With increasing the amount of MgO particles,the static extraction efficiency raises at first and then decreases.The dynamic extraction behavior of aniline from aqueous solution is similar to that of adsorption procedure in fixed bed.With the increase of the volume amount of Pickering emulsions,and the decrease of inlet rate and initial aniline concentration,the dynamic extraction efficiency increases.The extraction procedure based on Pickering emulsions provides a potential way for many industrial processes,such as sewage treatment and the extraction of the active ingredients of traditional Chinese medicines.