B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 12/00 (2006.01) B01D 33/11 (2006.01) B01D 33/60 (2006.01) B01D 36/00 (2006.01) D21C 9/06 (2006.01)
Patent
CA 2049952
A continuous-working process and apparatus for replacing the liquid in a liquid suspension of a fibrous material with another liquid are provided herein. The process involves replacing the liquid in a liquid-suspension of a fibrous or finely- divided material at least in part with another liquid having at least one of different physical or chemical properties. The replacement is achieved by forming a bed of the material on a moving filter surface and by displacing the liquid present in this bed with the other liquid. The bed of material is formed on a cylindrical filter surface which has been installed in a vertical orientation below the liquid surface in a container. The cylindrical filter surface conveys the bed of material continuously forwardly for the carrying out of a filtration and one or several successive liquid displacements. The liquid displacements are effected by maintaining a hydrostatic pressure difference across the formed bed. The formed bed is conveyed continuously horizontally forwardly. Liquids flow through the formed bed horizontally during the filtration and liquid displacement. The bed which has been so treated is simultaneously detached from the filter surface to form a new bed on the filter surface thus vacated.
Borden Ladner Gervais Llp
Hackman Prosessi Oy Ab
Salomans Oy
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