title: Inner-pipe structure to improve column heterogeneity and peak shape.
abstract: Column heterogeneity plays an important role in peak tailing and asymmetric profiles. We have designed a novel column structure (concentric column structure) that has a concentric inner-pipe nested in a column. This structure was studied by a number calculation method and wider diameter column experiments. The results showed that column heterogeneity and column efficiency were improved by inner-pipe structure. Moreover, the results showed that high-efficiency columns were stronger influenced by inner-pipe structure than low-efficiency columns. The influence of an inner-pipe was related to its size. The optimal inner-pipe diameter was nearly 0.625 times of column diameter. By using inner-pipe structure in this way, it was possible to decrease column heterogeneity and increase column efficiency of a wide-diameter column.
authors.affiliation: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029 China.
authors.forename: Di
authors.initials: D
authors.lastname: Hu
authors.affiliation: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029 China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Mei
authors.affiliation: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029 China.
authors.forename: Pengchao
authors.initials: P
authors.lastname: Shi
authors.affiliation: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029 China zhouxin@mail.buct.edu.cn zhouxin_buct@sina.cn.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou