Abstract: In order to enhance foam drainage,the column with an inner foam sleeve was designed to study the effect of column foam wall on separation performances for bovine serum albumin(BSA).The effects of foam wall on the liquid holdup at exit,bubble size,enrichment ratio and recovery efficiency were investigatedThe results indicated that compared with without inner sleeve,addition of inner sleeve decreased the liquid holdup,accelerated coarsening and coalescence of bubbles and increased enrichment ratio of BSAUnder the conditions of initial concentration of BSA 02 g·L-1,air flow rate 400 ml·min-1,the experimental column achieved up to a 206 fold increase in enrichment ratioThe enrichment of BSA went up with increase of inner sleeve lengthTheoretical analysis showed that ratio of exterior to interior channels enlarged with the increase of bubble diameterSo,the experiment column could obtain better performances at lower concentration and air flow rate,showing that the drainage rate was greater for plateau borders on wall than between bubblesTherefore the inner sleeve could provided more plateau borders on wall and improved foam drainage.

Key words: foam fractionation, column wall, liquid holdup, drainage, enrichment

摘要： In order to enhance foam drainage, the column with an inner sleeve in the foam phase was designed for studying effect of the column wall of foam phase on foam separation performances using bovine serum albumin(BSA) as the research system. The effects of the wall on the liquid holdup out of the top column, bubble size, enrichment and recovery percentage were investigated. The results indicated that the experimental column with the inner sleeve decreased the liquid holdup, accelerated the coarsening and coalescence of bubbles and increased enrichment of BSA compared the contrasted column without the inner sleeve. Under the conditions of the initial concentration 0.2 g?L-1 of BSA, air flow rate 400 ml?min-1, the experimental column achieved up to a 2.06 fold increase in enrichment compared to the contrasted column. The enrichment of BSA increased with the increase of inner sleeve length. Channel theoretical analysis showed that the ratio of exterior channels to interior channels increased with the increase of bubble diameter. So the experiment column obtained the better performances at the lower concentration and the lower air flow rate. The better performances obtained by experimental column showed that the drainage rate of plateau borders on wall was greater than that of plateau borders between bubbles. So the inner sleeve provided more plateau borders on wall and improved foam drainage.

关键词: 泡沫分离, 塔壁, 持液量, 排液, 富集比