Download Kirk-Othmer Encyclopedia of Chemical Technology Vol 27 by Raymond E Kirk; Donald F Othmer; Martin Grayson; David PDF
By Raymond E Kirk; Donald F Othmer; Martin Grayson; David Eckroth; et al
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Extra info for Kirk-Othmer Encyclopedia of Chemical Technology Vol 27
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12 Schematic representation of a nozzle discharge disc stack sedimenting centrifuge. 13 Photograph (left) of an ejecting, self-cleaning, disc stack centrifuge showing an external view of the disc bowl and accompanying motor drive. Also shown (right) is a typical disc stack arrangement. Both photographs with permission from Alfa Laval. Liquid–liquid mixtures can be separated and with more sophisticated units a three (two liquid and one solid) phase separation is achievable. In all cases, a sufficient density difference must exist between the phases present in the feed.
After hydraulically closing and sealing the plate pack, pressure driven cake filtration takes place in the downward direction via a pump. Compression with elastomer diaphragms at up to 1600 kPa, cake washing, and gas-blown deliquoring at up to 1000 kPa are then simultaneously performed in sequence within each chamber. At the end of the cycle the plate pack opens and the cloth is driven forward to discharge the cakes without manual assistance. At the same time, the filter cloth leaving the plate pack is washed by high pressure water sprays to maintain permeability.
Vacuum needs to be maintained during transit of the leaves and cakes between tanks. 3 Horizontal belt Typical uses: Separation of relatively free filtering solids where good posttreatment is required. FDS process ratings: 7 C, 9, 7, 8. Typical particle size and feed concentration range: 20–80000 5–30ϩ% w/w. 23). 5 m sϪ1. The feed suspension is introduced at one end of the filter and deliquored to produce a cake. 23 Photographs of a single horizontal belt vacuum filter with permission from Pannevis (top) and a large scale, multiple belt filter installation with permission from Delkor (bottom).