Patent ID: 6509060
Filing Date: 2003-01-21
Classification: B01D,C04B

Abstract:
A method of manufacturing a filter utilizing a ceramic porous membrane as a separation film, comprising the steps of:vertically disposing a porous substrate having a lower end and an upper end; substituting air in fine pores of the porous substrate with a liquid; isolating a first face of the porous substrate on which a separation film is to be provided from a second opposed face on which a separation film is not provided so as to enable a pressure differential between said first and said second faces of the porous substrate; continuously feeding a film deposition slurry comprising ceramic framework particles to allow the slurry to contact said first face of the porous substrate; applying a differential filtration pressure between said first and said second faces of the porous substrate; and depositing the slurry on said first face of the porous substrate; wherein an organic polymer is added to the slurry in an amount sufficient to prevent a pressure differential in the slurry opposing said first face of the porous substrate between positions adjacent said upper and lower ends of the porous substrate, said organic polymer comprising at least one material selected from the group consisting of welan gum, agar, starch and gelatin.