초록 ▼

Disclosed are modular filter-in-filter elements, namely an outer filter element and an inner filter element which may be assembled to form a filter cartridge for use in separation methods and systems. The outer filter element typically functions as a coalescing element and the inner element typicall

Disclosed are modular filter-in-filter elements, namely an outer filter element and an inner filter element which may be assembled to form a filter cartridge for use in separation methods and systems. The outer filter element typically functions as a coalescing element and the inner element typically functions as a particulate filter element. The disclosed filter cartridges may be structured for separating water from a hydrocarbon-based liquid fuel as the fuel moves through the cartridge from outside to inside.

대표청구항 ▼

1. A composite media formed from at least three layers of media material from an upstream direction to a downstream direction, namely Layer A, optionally Layer B, Layer C, and Layer D, the layers having characteristics as follows: Layer A comprises polymeric media material having a mean pore size of

1. A composite media formed from at least three layers of media material from an upstream direction to a downstream direction, namely Layer A, optionally Layer B, Layer C, and Layer D, the layers having characteristics as follows: Layer A comprises polymeric media material having a mean pore size of greater than about 10 μm, and relative to a layer immediately downstream of Layer A, Layer A has: (a) a higher porosity,(b) a larger pore size,(c) a larger mean fiber diameter,(d) a higher Frasier permeability, and(e) a lower contaminant removal efficiency;Layer C comprises polymeric material comprising nanofibers and having: (a) a mean pore size (M) of 0.2-10 μm;(b) a maximum pore size (MM) to mean pore size ratio (MM/M) of less than about 3,(c) a mean fiber diameter of 0.1-1.0 μm, and(d) a basis weight of greater than about 20 gsm; andLayer D comprises polymeric material having a mean pore size of greater than about 10 μm and provides support for the preceding layers, and relative to a layer immediately upstream of Layer D, Layer D has; (a) a higher porosity,(b) a larger pore size,(c) a larger mean fiber diameter,(d) a higher Frasier permeability, and(e) a lower contaminant removal efficiency;wherein the composite media has a permeability of 3-40 cfm. 2. The composite media of claim 1, wherein the composite media has a thickness of 0.68-1.85 mm. 3. The composite media of claim 1, wherein the composite media has a basis weight of 253-371 gsm. 4. The composite media of claim 1, wherein one or more layers are bonded to one or more adjacent layers via ultrasonic bonding. 5. The composite media of claim 1, wherein Layer A comprises polymeric media material having a maximum pore size of greater than about 50 μm. 6. The composite media of claim 1, wherein Layer A comprises polymeric media material having a maximum pore size of greater than about 100 μm. 7. The composite media of claim 1, wherein Layer A comprises polymeric media material having a permeability of 225-325 cfm. 8. The composite media of claim 1, wherein Layer D comprises polymeric media material having a nominal mean fiber diameter of 10-100 μm. 9. The composite media of claim 1, wherein Layer D comprises polymeric media material having a mean pore size of 20-35 μm. 10. The composite media of claim 1, wherein Layer D comprises polymeric material having a permeability of 50-75 cfm. 11. The composite media of claim 1, wherein Layer D comprises polymeric media material having a basis weight of 198±20 gsm. 12. The composite media of claim 1, wherein Layer B is not optional and Layer B comprises polymeric media material having one or more of the following characteristics: (a) a nominal mean fiber diameter of 1-5 μm; (b) a mean pore size of 5-30 μm; (c) a thickness of 0.1-0.3 mm; and (d) a basis weight of 38±10 gsm. 13. The composite media of claim 1, wherein at least one of Layer A, Layer B, Layer C, and Layer D comprises polymeric material selected from a group consisting of polyamide material, polybutylene terephthalate material (PBT), polyethylene terephthalate material (PET), and polyester material. 14. The composite media of claim 1, wherein Layer A, Layer B, Layer C, and layer D comprise polymeric material that has been meltspun or meltblown. 15. The composite media of claim 1, wherein Layer C comprises polyamide media material. 16. The composite media of claim 1, wherein at least one of Layer A and Layer B comprise PBT. 17. The composite media of claim 1, wherein Layer D comprises PET. 18. The composite media of claim 1, wherein Layer C is ultrasonically bonded to at least one of Layer A, Layer B, and Layer D. 19. A coalescing element comprising the composite media of claim 1. 20. A filter cartridge comprising the coalescing element of claim 19. 21. A method for removing a dispersed phase from a mixture of the dispersed phase in a continuous phase, the method comprising passing the mixture through the composite media of claim 1. 22. The method of claim 21, wherein the dispersed phase comprises water and the continuous phase comprise hydrocarbon liquid.