基于文丘里管的水力空化降解壳聚糖的研究

本文应用一种新的方法——文丘里管空化法来降解壳聚糖。研究了壳聚糖溶液浓度、p H、反应温度、压力、空化时间等因素对基于文丘里管空化的壳聚糖降解过程的影响,以壳聚糖的特性粘度下降率来衡量壳聚糖的降解程度,并分别对壳聚糖原料及其降解产物使用FT-IR、XRD进行表征比较分析。结果表明:在溶液浓度为3 g/L的条件下,最佳的降解条件为p H4.4,温度60℃,入口压力0.4 MPa,空化时间120 min,粘度下降率达49%。说明基于文丘里管的水力空化法可有效降解壳聚糖。 

Study on the degradation of chitosan with hydrodynamic cavitation based on the venturi tube

A new cavitation method of venturi tube was applied to degrade chitosan in this paper. The effect of chitosan concentration,p H,temperature,inlet pressure and cavitation time on the degradation of chitosan by venturi tube were studied,with the intrinsic viscosity reduction rate of chitosan as a measure indicator. The structures of initial chitosan and the degradation product were characterized by Fourier-transform infrared spectroscopy and X-ray diffraction. The results showed that under the condition of solution concentration at3 g/L,the optimum degradation condition for p H4.4,temperature 60 ℃,inlet pressure 0.4 MPa,cavitation time of 120 min,the intrinsic viscosity reduction rate reached 49%. It illustrated that hydrodynamic cavitation based on the venturi tube could degrade chitosan effectively.