三烷基混合叔胺-正辛醇-磺化煤油萃取菜籽粕酸脱毒液中的植酸

Extraction of Phytic Acid from the Detoxified Liquor of Rapeseed Meal Using Trialkylamine-n-Octanol/sulfonated Kerosene

用三烷基混合叔胺(N235)-正辛醇-磺化煤油从菜籽粕酸脱毒废液中萃取植酸,研究了水相pH值、植酸浓度、N235浓度对植酸分配比的影响。确定萃取植酸的最佳条件为:初始pH=3.0、N235的浓度0.17mol/L、正辛醇浓度0.48mol/L、相比R为5:1、萃取时间5min,对0.02mol/L标准植酸溶液的萃取率为95.2%。以0.25mol/LNaOH溶液为反萃取剂,在相比5:2下反萃取5min,三级反萃取总收率达到82.6%。实验证明加入正辛醇可提高N235萃取植酸的分配比,可能与正辛醇和N235形成"分子簇"结构产生协同萃取有关。

Phytic acid was extracted from the waste detoxified liquor of rapeseed meal using trialkylamine（N235）-n-octanol/sulfonated kerosene.The effects of pH and the concentrations of phytic acid and N235 on partition coefficient were studied.The optimal conditions of extraction are as follows：the pH value is 3.0,the concentration of N235 is 0.17 mol/L,the concentration of n-octanol is 0.48 mol/L,the phase ratio is 5：1 and the extraction time is 5 min.Under the optimal operating conditions and at a concentration of 0.02 mol/L of phytic acid in the pre-extraction solution,the single extraction efficiency was 95.2%.The conditions of back extraction are as follows：the concentration of NaOH solution is 0.25 mol/L,the phase ratio is 5：2 and the back extraction time is 5 min.The overall yield was 82.6% after a three-stage back-extraction treatment.The results indicate that n-octanol could enhance the extraction ratio of phytic acid,which is probably caused by the N235-n-octanol molecular cluster.