Patent ID: 9120039
Filing Date: 2015-09-01
Classification: B01D,C02F

Abstract:
1. A method for renewing liquid entry faces of a bed comprising granular material, comprising: producing countercurrent pulses of liquid into a bed of granular material, into a vertical supply column of the granular material in the bed, causing the granular material to move bodily toward liquid entry faces of the granular material in the bed; spilling granular material from liquid entry faces of the bed, and making good loss of the granular material in the spilling from the vertical supply column; producing a longitudinally disposed, sharp pulse of liquid into a treated liquid space adjacent the bed by: providing a vertical tank in the treated liquid space, said vertical tank, the tank having an outer cylinder with a cylindrical wall and upper and lower ends, disposing perforations longitudinally along the cylindrical wall, wherein the perforations are spaced from each other in a path parallel to an axis of said vertical tank; stoppering said perforations; and sequentially: introducing liquid at elevated pressure in said tank; quickly unstoppering said perforations, thereby releasing said liquid from said vertical tank in form of longitudinally disposed, sharp pulses of liquid into the treated liquid space in a direction perpendicular to said axis of said vertical tank, wherein the perforations are in a small portion of a circumference of said vertical tank, and thereby pulsing liquid through the vertical supply column and spilling granular material from the liquid entry faces.