论文部分内容阅读
利用络合萃取法回收废液中的6-APA,考察了稀释剂种类、络合剂浓度、p H、相比等对萃取效果的影响。结果表明,在0.117 5 mol/L甲基三辛基氯化铵氯仿溶液为混合萃取剂,水相p H=6,萃取剂与水相体积比为0.4时,6-APA的萃取率最高可达56.96%。对反萃过程的研究表明,使用p H=1的盐酸反萃液,反萃相与萃取相体积比为0.4时,反萃率最高可达51.42%。三级萃取和反萃取后,总的萃取和反萃率可达95%以上,络合剂可循环再生使用7次以上而不影响萃取和反萃效果,大大降低了操作成本。经络合萃取处理后的废液中6-APA质量分数大大降低,实现了经济和环保效益的双赢。
The complex extraction method was used to recover the 6-APA from waste liquid. The effects of diluent type, complexing agent concentration, p H, and other factors on the extraction efficiency were investigated. The results showed that the highest extraction rate of 6-APA was obtained when 0.117 5 mol / L methyltrioctylammonium chloride in chloroform solution was mixed extractant with pH = 6 and volume ratio of extractant to water of 0.4 Up to 56.96%. The study on the stripping process showed that stripping ratio of up to 51.42% could be obtained by using hydrochloric acid stripping solution with p H = 1 when the volume ratio of stripping phase to extracting phase was 0.4. After three-stage extraction and back-extraction, the total extraction and stripping rate can reach more than 95%, and the complexing agent can be recycled for more than seven times without affecting the extraction and stripping effects, greatly reducing the operation cost. The 6-APA mass fraction in the waste water after the complexation and extraction process is greatly reduced, achieving a win-win economic and environmental benefits.