超重力萃取精馏传质性能研究  

Study on the process of mass transfer property of high gravity distillation with extractive agent

作　　者：李道明[1,2] 栗秀萍[1,2] 刘有智[1,2] 李宁[1,2] 宋子彬[1,2] 

机构地区：[1]中北大学化工与环境学院,山西太原030051 [2]山西省超重力化工工程技术研究中心,山西太原030051

出　　处：《现代化工》2016年第2期133-136,共4页Modern Chemical Industry

摘　　要：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%。Using Pall ring packing and potassium acetate as an extracting agent, separation of ethanol/water system by using high gravity technology with salt was studied, under the conditions of atmospheric pressure and ambient temperature, average high gravity factor of 21 - 188, reflux ratio of 1.5 -3.5, feedstock flux of 1.24 -2. 50 kmol/h, mole concentration of feedstock of 0. 064 6 - 0. 242 5, salt consumption of 5 - 25 g/L. The results indicated that HERDB runs smoothly. The number of theoretical plate NT of four-stage higee distillation equipment increases with the advance of S and xf. It decreases with the advance of R, while NTP increases first then decreases with the advance of/3 and F. The optimal operating conditions for the experiment areβ = 83. 609 4, R = 1.5, F = 1. 731 7 kmol/h, xf= 0. 242 5, S = 25 g/L,the height of mass transfer unit of distillation section, stripping section and the whole system is 3.75 mm, 7. 61 mm and 4. 29 ram, which is less than HETP of HERDB. An empirical model for the distillation of high gravity distillation with salt was established. The deviation was within 5% ,and the average deviation was 4. 42%.

关 键 词：高效旋转精馏床 萃取精馏 乙醇/水 传质性能 

分 类 号：TQ053.5[化学工程]