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利用填装星型填料的HERPB加入醋酸钾分离乙醇/水物系,在超重力因子β为21~188、回流比R为1.0~3.5、原料流量F为1.24~2.50 kmol/h、进料摩尔分数xf为0.064 6~0.242 5、溶盐量S为5~25 g/L、0.1 MPa和室温进料操作条件下对其传质性能进行研究。结果显示,整个实验过程中高效旋转精馏床(HERDB)运行平稳。高效旋转精馏床的传质效果随超重力因子β和原料液流量F先增加后减小;随溶盐量S和原料液浓度xf的增加而提升;随回流比R的增大而降低。实验的最佳操作条件为β=83.609 4、R=1.5、F=1.731 7 kmol/h、x_f=0.242 5、S=25 g/L,精馏段、提馏段和整个系统的HETP分别为3.75、7.61、4.29 mm,小于超重力精馏传质单元高度。建立了超重力萃取精馏的经验模型,偏差在±5%以内,平均偏差为4.42%。
The separation of ethanol / water by adding potassium acetate to HERPB filled star-shaped packing was carried out under the conditions of super gravity factor β of 21 ~ 188, reflux ratio R of 1.0 ~ 3.5, feed flow F of 1.24 ~ 2.50 kmol / h, Fraction xf was 0.064 6 ~ 0.242 5, the salt content S was 5 ~ 25 g / L, and the mass transfer performance under 0.1 MPa and room temperature feed operation was studied. The results showed that HERDB operated smoothly throughout the experiment. The mass transfer efficiency of the high efficiency rotary distillation bed first increases and then decreases with the increase of the super gravity factor β and the feed liquid flow rate F; it increases with the increase of the salt content S and the feed liquid concentration xf; decreases with the increase of the reflux ratio R. The best experimental conditions were β = 83.609 4, R = 1.5, F = 1.731 7 kmol / h, x_f = 0.242 5, S = 25 g / L and the HETP of the rectifying section, the stripping section and the whole system were 3.75,7.61,4.29 mm, less than the height of gravity distillation unit. The empirical model of extractive extractive distillation was established with the deviation within ± 5% and the average deviation of 4.42%.