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US 5,342,517 AGranted
Filtration cassette article, and filter comprising same
OwnerHenry B. Kopfinventor
Life of this patent
Estimating the term…
Abstract
A filtration cassette, of a type comprising membrane filter sheets arranged in a peripherally bonded array of multilaminate character wherein the filter sheets alternate with foraminous (e.g., screen or mesh) sheet elements, and a cross-flow filter comprising a multiplicity of stacked filtration cassettes of such type. The filtration cassettes and filter of the invention may be advantageously employed for dewatering of aqueous biomass suspensions, desalting of proteins, removal of secreted metabolites from cellular suspensions, and the like.
Claims13
A filtration cassette comprising a multilaminate array of sheet elements of generally rectangular and generally planar shape with main top and bottom surfaces, wherein the sheet elements include."
- a first foraminous permeate sheet of screen or mesh material, having (i) a polygonal-shaped distribution basin open at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at side portion of the sheet;
- a first sheet of filter material having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet, wherein the foraminous permeate sheet is bonded to the first sheet of filter material at their respective end and side portions, with their basin openings and permeate passage openings in register with one another and the basin openings being circumscribingly bonded at respective end portions of the first sheet of filter material and the first foraminous permeate sheet, and with a central portion of the first sheet of filter material and the foraminous permeate sheet being unbonded so as to define a central portion of the permeate channel of the foraminous permeate sheet communicating with the permeate passage in the first sheet of filter material and the foraminous permeate sheet;
- a foraminous retentate sheet of screen or mesh material, having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, (ii) a permeate passage opening at a side portion of the sheet, and (iii) a central flow channel of generally rectangular character, extending between and communicating with the distribution basin openings defining the inlet and outlet passages of the foraminous retentate sheet, wherein the foraminous retentate sheet is bonded to the first sheet of filter material at their respective end and side portions, on an opposite side of the first sheet of filter material than the first foraminous permeate sheet, with their basin openings and permeate passage openings in register with one another and the permeate passage opening of the foraminous retentate sheet being circumscribingly bonded to the first sheet of filter material, and with a central portion of the first sheet of filter material and the foraminous retentate sheet being unbonded to permit permeate contacting the foraminous retentate sheet to flow through the first sheet of filter material to the foraminous permeate sheet;
- a second sheet of filter material having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet, wherein the foraminous retentate sheet is bonded to the second sheet of filter material at their respective end and side portions, on an opposite side of the foraminous retentate sheet than the first sheet of filter material, with their basin openings and permeate passage openings in register with one another and the permeate passage opening of the foraminous retentate sheet being circumscribingly bonded to the second sheet of filter material, and with a central portion of the second sheet of filter material and the foraminous retentate sheet being unbonded to permit permeate contacting the foraminous retentate sheet to flow through the second sheet of filter material;
- and
- a second foraminous permeate sheet of screen or mesh material, having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet wherein the second foraminous permeate sheet is bonded to the second sheet of filter material at their respective end and side portions, on an opposite side of the second sheet of filter material than the foraminous retentate sheet, with their basin openings and permeate passage openings in register with one another and the basin openings being circumscribingly bonded at respective end portions of the second sheet of filter material and the second foraminous permeate sheet, and with a central portion of the second sheet of filter material and the second foraminous permeate sheet being unbonded so as to define a central portion permeate channel of the second foraminous permeate sheet communicating with the permeate passage in the second sheet of filter material and the second foraminous permeate sheet;
- wherein the foraminous retentate sheet of screen or mesh material on each face thereof comprises a series of transversely spaced-apart, longitudinally extending ribs, each extending outwardly from the foraminous retentate sheet to an outer extremity, with the first and second sheets of filter material additionally bonded to the foraminous retentate sheet at rib extremities on respective sides thereof.
4 more elements
A stacked cassette filter including a stacked array of filtration cassettes each comprising a multilaminate array of sheet elements of generally rectangular and generally planar shape with main top and bottom surfaces, wherein the sheet elements include:
- a first foraminous permeate sheet of screen or mesh material, having (i) a polygonal-shaped distribution basin open at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at side portion of the sheet;
- a first sheet of filter material having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet, wherein the foraminous permeate sheet is bonded to the first sheet of filter material at their respective end and side portions, with their basin openings and permeate passage openings in register with one another and the basin openings being circumscribingly bonded at respective end portions of the first sheet of filter material and the first foraminous permeate sheet, and with a central portion of the first sheet of filter material and the foraminous permeate sheet being unbonded so as to define a central portion of the permeate channel of the foraminous permeate sheet communicating with the permeate passage in the first sheet of filter material and the foraminous permeate sheet;
- a foraminous retentate sheet of screen or mesh material, having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, (ii) a permeate passage opening at a side portion of the sheet, and (iii) a central flow channel of generally rectangular character, extending between and communicating with the distribution basin openings defining the inlet and outlet passages of the foraminous retentate sheet, wherein the foraminous retentate sheet is bonded to the first sheet of filter material at their respective end and side portions, on an opposite side of the first sheet of filter material than the first foraminous permeate sheet, with their basin openings and permeate passage openings in register with one another and the permeate passage opening of the foraminous retentate sheet being circumscribingly bonded to the first sheet of filter material, and with a central portion of the first sheet of filter material and the foraminous retentate sheet being unbonded to permit permeate contacting the foraminous retentate sheet to flow through the first sheet of filter material to the foraminous permeate sheet;
- a second sheet of filter material having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet, wherein the formaminous retentate sheet is bonded to the second sheet of filter material at their respective end and side portions, on an opposite side of the foraminous retentate sheet than the first sheet of filter material, with their basin openings and permeate passage openings in register with one another and the permeate passage opening of the foraminous retentate sheet being circumscribingly bonded to the second sheet of filter material, and with a central portion of the second sheet of filter material and the foraminous retentate sheet being unbonded to permit permeate contacting the foraminous retentate sheet to flow through the second sheet of filter material;
- and
- a second foraminous permeate sheet of screen or mesh material having (i) a polygonal-shaped distribution basin opening at each of opposite end portions of the sheet defining respective inlet and outlet passages, each distribution basin being bounded by generally linear side edges defining corners of the basin at respective intersections of the side edges, and (ii) a permeate passage opening at a side portion of the sheet, wherein the second foraminous permeate sheet is bonded to the second sheet of filter material at their respective end and side portions, on an opposite side of the second sheet of filter material than the foraminous retentate sheet, with their basin openings and permeate passage openings in register with one another and the basin openings being circumscribingly bonded at respective end portions of the second sheet of filter material and the second foraminous permeate sheet, and with a central portion of the second sheet of filter material and the second foraminous permeate sheet being unbonded so as to define a central portion permeate channel of the second foraminous permeate sheet communicating with the permeate passage in the second sheet of filter material and the second foraminous permeate sheet;
- wherein the foraminous retentate sheet of screen or mesh material on each face thereof comprises a series of transversely spaced-apart, longitudinally extending ribs, each extending outwardly from the foraminous retentate sheet to an outer extremity, with the first and second sheets of filter material additionally bonded to the foraminous retentate sheet at rib extremities on respective sides thereof.
4 more elements
Dependencies are inferred from the claim text.