Abstract: A new method for direct extracting sodium phytate from cornsoaking, the byproduct produced in the process of corn fermentation, was provided. The extracting process was analyzed with orthogonal experiments. First, the cornsoaking water was passed through the anion exchange resin to adsorb phytic acid, while the impurities in the water were removed. Then, sodium hydroxide solution was used as desorbent to desorb the phytic acid, and the sodium phytate was formed by vaporizing and concentrating. Through analyzing the results of orthogonal experiments with data extreme difference method, the optimum technical parameters were determined as follows:The adsorption space velocity of raw material liquid is 3 h-1, the desorption space velocity of desorbent is 2 h-1 , the temperature of desorption is 35±2 ℃, and the concentration of desorbent is 6.5%. The repetitive experiments show that the experimental results are characterized by good repeatability.

Key words: biochemical engineering, sodium phytate, cornsoaking water, orthogonal experiment, farm product process, parameter optimization