The crystallization of glutamic acid is a critical step in its purification.To achieve mild and high efficiency in the process of glutamic acid crystallization,the ultrasonic-promoted glutamic acid crystalloblastic process was studied.In this study,the purity of glutamic acid was taken as the index,and ultrasonic power,ultrasonic temperature,and liquid concentration were taken as the single factors.Based on the single factor test,the Box-Behnken response surface methodology was adopted to optimize the crystalloblastic process,and compared it with the existing high-temperature crystalloblastic process,the characteristics of glutamate ultrasonic crystallization under optimal conditions were studied.The results showed that the optimal process parameters for glutamate ultrasonic crystallization were ultrasonic power 595 W,ultrasonic temperature 80 ℃,and solid-liquid concentration 29.5°Bé.Under these conditions,the purity of crystalloblastic glutamic acid was 98.39％.The study shows that the ultrasonic crystallization process of glutamic acid is feasible and can provide a reference for the extraction of glutamic acid crystallization.
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