EFFLUX PERFORMANCE OF SUBMICRON PARTICLES IN PACKED-BED UNDER PERIODIC PRESSURE CONDITIONS

Permeation experiments of ultrapure water were conducted under periodi c pressure conditions using a packed bed obtained by dispersing submic ron particles of polymethyl methacrylate (PMMA) uniformly into a packe d bed of particles of White Alundum. It is clearly demonstrated that w ashing performance under periodic pressure conditions where the permea tion pressure is applied periodically is improved dramatically, compar ed with that under constant pressure conditions. It is also shown that the effect of periodic pressure operation is especially noticeable in the initial stage of the pressurizing period, and that a pressurizing time smaller than 2 min is very effective under conditions examined i n this study.