Filtering process
AssigneeAlfa-Laval AB
InventorRobert M. Sandblom
Life of this patent
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Abstract
A filterable fluid flows under pressure through a filtering passage along one side of the filter, so that there is a substantial pressure drop along the filter area in the flow direction. A fluid flow in this same direction is provided in a filtrate passage extending generally parallel to the opposite side of the filter, so as to create a corresponding pressure drop in the flow direction in the filtrate passage, whereby the pressure difference between both sides of the filter is maintained substantially constant throughout the entire filter area.
Claims7
A filtering process, especially for ultra-filtration, which comprises flowing a filterable fluid under pressure through a filtering passage extending along one side of a filter, passing one part of said fluid through the filter while discharging an unfiltered part of said fluid from an outlet of said passage, said flow through the filtering passage being provided with a sufficiently high velocity to create a substantial pressure drop along the filter area in the flow direction through said passage, providing a fluid flow in the same said direction in a filtrate passage extending generally parallel to the opposite side of said filter, said passage communicating with each other through the filter, and maintaining in said filtrate passage a pressure drop of the same magnitude and in the same direction as said substantial pressure drop in the filtering passage, whereby the pressure difference between both sides of the filter is maintained substantially constant throughout the entire filter area.
Dependencies are inferred from the claim text.