42. Effect of Ultrasound on Lysine Muriate Crystallization

Ultrasound was applied to the crystallization process of lysine muriate solution. The effects on crystal yield of lysine muriate were investigated, including ultrasonic time, ultrasonic power, and crystallization time. The experimental results showed that the crystal yield reached 84.08 % with the adequate conditions of ultrasonic power 112 W, ultrasonic time 50 min, and crystallization time 5 h. And the effects of ultrasonic power on the nucleation induction period and crystal appearance of lysine muriate were also researched, the results indicated that with ultrasound, induction period was shortened significantly compared to that without it at the same supersaturation ratio. The higher the ultrasonic power, the shorter the induction period, and the smaller the crystals. With the increase of ultrasonic power, the crystals became smaller and more uniform. It can be concluded that using ultrasound-assisted crystallization cannot only improve the crystallization rate and crystal yield, but also obtain crystalline product with the characteristics of small particles and uniform distribution by controlling ultrasonic power.