| With soybean meal as raw material, composite amino acids solution was prepared by acid hydrolysis under pressure, and N-coconut oil acyl composite amino acids surfactant were synthesized from cocoyl chloride and composite amino acids solution. The effects of volume ratio of composite amino acids solution to cocoyl chloride, pH, reaction temperature, volume ratio of acetone to composite amino acids mixed solution, and reaction time on the product yield were studied. Based on single factor experiment, the process conditions were optimized using response surface methodology, and the surface activity of the acylated product was determined. The results showed that the optimal process conditions of synthesis of N-coconut oil acyl composite amino acids from soybean meal were obtained as follows: volume ratio of composite amino acids solution to cocoyl chloride 4.2∶1, pH 11.2, reaction temperature 36℃, volume ratio of acetone to composite amino acids solution 1.7∶1, and reaction time 2 h. Under the optimal conditions, the product yield was 91.07% and the surface activity of the product was superior. |
