Dynamic Studies of the Pressure-swing Distillation for Separating Acetonitrile-water Azeotrope System
Based on the steady-state process of the pressure-swing distillation for separating the acetonitrile-water azeotrope,a dynamic model of pressure swing distillation was established,and its different dynamic schemes were explored.The results showed that whether the control structure of the proportional control module of both the return flow and the distillate flow,or the control structure of return flow and the input flow,the product purity appeared divergent oscillation.The stability time of the temperature control structure is shorter than that of the composition-temperature control structure,but the water purity can only be maintained around 99.88wt％.The proportional control module of the reboiler heat duty of atmospheric column and feed flow can adjust the steam flowrate of atmospheric column in time.The composition controller can monitor the product purity online.The composition-temperature control structure has stronger anti-disturbance ability.
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维普
