膜结构填料的物化特性对精馏分离异丙醇/水体系的影响  

Effect of Physical Chemical Characteristics of Membrane Structured Packings with Different Materials on iso-Propanol/Water Distillation

作　　者：杨志宏[1] 张燕 吴景[1] 陈建孟[1] 张国亮[1] 朱利平[3] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310014 [2]林德工程(杭州)有限公司,浙江杭州310007 [3]浙江大学材料与化学工程学院,浙江杭州310027

出　　处：《高校化学工程学报》2011年第1期37-42,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20776133;20976163);浙江省重大科技计划(2008C13014-2)资助项目

摘　　要：选用了三种不同材料的中空纤维膜(PP,PS和PES)构建新型膜接触器结构填料,并对异丙醇/水体系进行了精馏分离过程研究。在新型膜接触器中,液相和气相分别在管程和壳程进行逆向流动。实验结果表明:三种结构填料对异丙醇/水体系的分离效果依序为PES>PP>PS。不同材料的中空纤维膜作为结构填料对异丙醇/水溶液体系的分离效率均较高,HTU值一般可达8～10 cm,其总传质系数分别为0.0026、0.0020和0.0019 cm·s-1。三种中空纤维膜填料均可在常规填料液泛线以上的气速范围操作,不受常规填料操作弹性的限制,其水力学特性和传质效率较常规填料优势明显。根据Hansen溶解度参数理论并对膜微观结构分析显示,PES、PP较PS具有更好的操作稳定性。Polypropylene（PP）,polysulfone（PS） and polyethersulfone（PES） hollow fiber membranes were used as novel structured packings,respectively,in contactors for iso-propanol/water distillation.In the contactor,the liquid flows through the lumens of fibers,and the vapor flows counter currently outside the fibers.Results indicate that all the contactors with above three kinds of membranes separately have higher separation efficiency than the distillation column with traditional packings.The HTU values of above hollow fibers could attain to the range of 8~10 cm.The sequence of separation efficiency for above three membrane contactors is PESPPPS and their overall mass transfer coefficients are 0.0026,0.0020 and 0.0019 cm？s-1,respectively.All contactors with above hollow fiber membranes can operate normally under the gas velocity above the flooding limit of conventional packing column,which presents great advantage in hydraulics performance and separation efficiency.Further analyses with Hansen solubility parameters and micro-structure show that PES and PP structured packing have better operation stability than PS.

关 键 词：PP/PS/PES中空纤维膜接触器 结构填料 异丙醇/水 精馏 

分 类 号：TQ028.13[化学工程] O648.22[理学—物理化学]