旋转填料床间歇萃取精馏性能研究

为了寻找强化间歇萃取精馏过程的有效途径,在装填2mm×2mm三角形螺旋填料的旋转床中,以乙醇-水为实验物系,乙二醇为萃取剂,通过考察馏出液组成随时间的变化情况,产品的纯度和回收率随转速、回流比和溶剂比的变化情况,研究了旋转填料床间歇萃取精馏的性能。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极大地强化了间歇萃取精馏过程,具有分离效果好、操作时间短、节能、小设备大生产能力等突出优点;存在最佳转速使产品的纯度和回收率最大;增加溶剂比和回流比均能使产品的纯度和回收率得到提高,但增加溶剂比的效果更显著。旋转填料床是强化间歇萃取精馏过程的有效途径。

Study on characteristics of batch extractive distillation in rotating packed bed

In order to seek for an effective way to strengthen the batch extractive distillation process,an operation is made in the rotating packed bed filled with φ2 mm×2 mm triangle spiral packing using ethanol-water as experimental system,glycol as an extractant.The variation status of distillate composition is studied over the change of time,the variation of product purity wD and product recovery ηe are investigated by altering rotating speed n,reflux ratio R and solvent ratio S to study the characteristics of the batch extractive distillation in a rotating packed bed.The results show that the strong centrifugal force and the synergies of the efficient fillers in the rotating bed can strengthen the batch extractive distillation process significantly and it has advantages of good separation effect,short operation time,good energy conservation,big production capacity for small devices and so on.With the increase of n,there exits a best rotational speed nopt to make the product purity and recovery to the maximum.The product purity and recovery increase with the increasing of solvent ratio and reflux ratio,but the solvent ratio affects more sharply.So the rotating bed is an effective way to strengthen the batch extractive distillation process.