Abstract: Using stainless steel corrugated wire mesh packing, the separation of co-boiling system (ethanol/water) was studied by using the high gravity vacuum distillation. The effects of the ethanol mass fraction of feed x_f (50%~95%), the operating pressure P (101.33~11.33 kPa) and average high gravity factor β (20.90~130.64) on the mass transfer property of ethanol/water system were studied. In this experiment, the running of the single-stage higeedistillation equipment was stable and the mass transfer property increased first then decreased with increasing β. And it increased with decreasing P and increasing x_f , and broke the azeotropic point when P was 11.33 kPa. Under the same conditions, the separation effect of the single-stage higee distillation equipment was higher than that of the traditional tower. The mass transfer property was 7.94~14.20 mm, only 1/6~1/4 of the traditionl tower. Mass transfer property was significantly enhanced. The energy consumption analysis showed that the gravity device itself was small and easy to reach the desired degree of vacuum, reducing energy consumption significantly.

Key words: single-stage higee, vacuum distillation, ethanol/water, mass transfer property

摘要： 以不锈钢波纹丝网为填料,应用超重力减压精馏间歇全回流操作分离乙醇/水共沸物系。考察了进料乙醇质量分数x_f为50%~95%、操作压力P为101.33~11.33kPa和超重力因子β为20.90~130.64时乙醇-水体系的传质性能。实验中设备运行稳定并且单级旋转精馏床传质性能随着超重力因子β的增大先增强后减弱,随着压力P的减小和进料浓度x_f的增加而增强,并在P=11.33kPa时分离高浓度原料时打破共沸点。与相同条件下传统填料塔相比,分离效果明显高于传统塔,且HETP为7.94~14.20mm,仅为传统塔的1/6~1/4,传质性能显著增强。并对能耗进行分析,超重力装置由于自身体积小等优点便于达到所需真空度,能耗降低明显。

关键词: 单级旋转精馏床, 减压精馏, 乙醇/水, 传质性能