B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 37/00 (2006.01) B01D 33/04 (2006.01) B01D 33/60 (2006.01) B01D 33/66 (2006.01) B01D 35/31 (2006.01)
Patent
CA 2153309
A slurry is subjected to a filtration and washing process in order to separate the liquor from the solids. The filtration and washing process is carried out in a housing (101) enclosing an inert gaseous atmosphere which also passes through the filter cake and may be recycled, after treatment, to remove contaminants therefrom. To prevent recontamination of the filter cake as a result of the recycled gas entisining contaminant vapours within the housing (101), the gas is introduced into the housing (101) at a downstream location (152a, 166) relative to the direction of travel of the filter cake on a movable filter medium (100) and in such a way as to develop a contaminant-concentration gradient whereby the cleanest cake is contacted by gas having the lowest contaminant level.
Bennett Jones Llp
Imperial Chemical Industries Plc
Invista Technologies S.a.r.l.
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