| With sodium methoxide as catalyst, soybean oil fatty acid ethyl ester was synthesized by transesterification of ethanol and soybean oil，then the soybean oil fatty acid ethyl ester was purified by deep eutectic solvent (DES) prepared by choline chloride and urea. The results showed that the optimal synthesis conditions were obtained by orthogonal experiment as follows: catalyst dosage 1.3%, molar ratio of ethanol to oil 8∶1, reaction temperature 65℃ and reaction time 3 h. Under these conditions，the conversion rate of soybean oil reached 99.38%. The purification conditions of soybean oil fatty acid ethyl ester by DES were optimized by orthogonal experiment as follows: volume ratio of DES to soybean oil fatty acid ethyl ester 1∶]1, washing temperature 75℃ and washing time 4 min. Under these conditions, the residue content of glycerol in the purified product was 0.017%,and the pH of the purified product was 7.0,meanwhile, there was no wastewater emission in the purification process. |
