Abstract:

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.

Key words: phytic acid, extraction, N235, rapeseed meal, n-octanol