超重力旋转填充床用于高黏聚合物脱挥的研究进展  

Devolatilization of high viscous polymer via high gravity rotating packed bed

作　　者：李沃源[1] 毋伟[1] 邹海魁[1] 初广文[1] 邵磊[1] 陈建峰[1] 

机构地区：[1]北京化工大学化学工程学院教育部超重力工程研究中心,北京100029

出　　处：《化工进展》2010年第2期211-216,232,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(20821004);国家高技术研究发展计划项目(国家863计划;2006AA030202);国家重点基础研究发展计划(2009CB219903);教育部新世纪优秀人才支持计划(NCET-07-0053)资助项目

摘　　要：针对高黏聚合物体系脱挥过程的特点,指出聚合物脱挥技术推广的关键是开发高速表面更新的新型高效传质设备。工业上常规的脱挥设备存在不同的使用限制,本文提出了设计新型旋转填充床用于高黏聚合物脱挥的可能性,并类比螺杆挤出机结构介绍其脱挥机理。结果表明,相比常规的脱挥设备,旋转填充床脱挥效率高,能耗低。采用该技术对丙烯腈系聚合物进行两次循环脱挥处理,丙烯腈脱除率达到99%以上。在脱挥过程中,解吸的挥发分气体在第一时间离开填料层,并迅速由真空泵抽走,防止了挥发分的二次溶解。A crucial issue for the popularization of high viscous polymer devolatilization process is to develop high efficiency mass transfer apparatus with improved surface renewal rate. For the limitations of conventional apparatuses,a vertical rotating packed bed for high viscous polymer devolatilization process is proposed. The devolatilization mechanism of the proposed apparatus is illustrated by analogizing with the structure of screw extruder. Results show that the rotating packed bed has a higher devolatilization efficiency and a lower energy consumption as compared with conventional devices. Using the proposed vertical rotating packed bed,the acrylonitrile monomer removal efficiency from polyacrylonitrile can be achieved to over 99% upon twice devolatilized. As the desorbed volatiles can depart as soon from the packed bed and then be transfered by vacuum bump,this proposed technology will efficiently prevent the secondary dissolution of the volatiles.

关 键 词：聚合物脱挥 旋转填充床 高黏流体 传质 挥发分 

分 类 号：TQ316[化学工程—高聚物工业]