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为了深入了解三角形螺旋填料旋转床间歇精馏不稳态开工过程的影响因素及规律,以乙醇-水为实验物系进行实验和模型研究。改变料液浓度、再沸器加热功率和转速的开工实验结果表明,旋转填料床中强大的离心力和高效填料的协同作用使得间歇精馏不稳态开工过程得到极大强化、开工时间很短(30min左右),节能;在最佳转速下开工可使馏出液浓度最大,馏出液浓度随料液浓度和再沸器加热功率的增加而增大。旋转填料床间歇精馏过程在最佳转速和较大的再沸器加热功率下开工,效果最好;以平衡级理论为基础建立的数学模型能较好地描述该过程的不稳态开工规律,模拟值与实验值吻合良好,平均相对误差在2%以内。旋转填料床是强化间歇精馏过程的有效途径。
In order to get a better understanding of the influential factors and regularities of intermittent distillation instability of triangular rotating packed bed, experimental and model studies were conducted using ethanol-water as the experimental system. The experiment results of changing feed concentration, reboiler heating power and speed show that the strong centrifugal force and the synergistic effect of high-efficiency packing in rotary packed bed make the process of intermittent distillation unsteady start-up greatly enhanced and the start-up time is very short 30min or so), energy saving; start working under the optimal speed can make the distillate concentration maximum, distillate concentration increases with feed concentration and reboiler heating power. The intermittent distillation process of rotary packed bed is started with the optimal revolving speed and larger reboiler heating power, and the best effect is achieved. The mathematical model established on the basis of equilibrium theory can well describe the unstable start-up law of the process , The simulation value is in good agreement with the experimental value, and the average relative error is within 2%. Rotating packed bed is an effective way to strengthen the batch distillation process.