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Seal for separation device
Patents
Seal for separation device P a t e n t n u m b e r : US 5277 807 P u b l i c a t i o n date: 11 J a n u a r y 1994 (application) I n v e n t o r : Yves Gaignet, C a t h e r i n e A Lavole Mlllipore C o r p o r a t i o n
This invention relates to a sealing means for a spiral wound filtration apparatus such as in reverse osmosis or ultrafiltration apparatus. Liquid separation apparatus such as filtration or reverse osmosis apparatus includhag a spiral wound cartridge are utiliTed in separation processes for liquids. The spiral wound cartridge is formed by interleaving one or more membrane layers, one or more spacer layers and one or more liquid irapermeable layers about a central hollow core which functions as an outlet for permeate. The cartridge includes a sealing configuration which prevents admixture of permeate with either feed or retentate, The cartridge is positioned within a housing where feed is introduced axially into the cartridge, retentate is removed axially from the cartridge and permeate is recovered by way of the central hollow core which is in fluid communication with a fluid outlet in a cover which also seals the cartridge within the housing. The feed is sealed from the retentate by a chevron-shaped elastomeric seal which is interposed between the outside surface of the cartridge and the inside surface of the housing for the cartridge in a manner to seal the feed inlet from the retentate outlet, An O-ring, spaced apart from the chevron-shaped seal, is positioned between the cover for the housing and the housing to prevent feed leakage from the housing prior to its being passed through the the chevron-shaped seal has a tendency to fail under the normal operating conditions of pressure and fluid flow primarily due to incomplete sealing at the inside wall of the housing and the seal surface contacting the inside wall of the housing, The present invention provides a seal for use in conjunction with a
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spiral wound liquid separation device which includes a filtration membrane such as an ultrafiltration membrane or a semipermeable reverse osmosis membrane. The spiral wound separation device is positioned with a housing, and a cover for the housing that cooperates with the housing and the seal to effect desired fluid flow through the separation device. The seal prevents admixture of a feed liquid to be passed through the separation device and retentate liquid removed from the separation device, One end of the seal is adhered to the outside surface and about the entire circumference of the spiral wound separation device adjacent a fluid inlet within a cover. A second end of the seal is positioned between a top surface of the housing and the cover, The seal prevents incoming liquid feed to by-pass the separation device prior to being removed from the housing. The second end of the seal preferably has a generally O-ring shaped cross section and is maintained in a sealing relationship between the cover and the housing under a compressive force,
components of the composite. Other polymeric resins may also be added to improve resistance to oils and antifreeze. The fibre component is generally present at about 3 to 15% by weight of the entire composite material. It may be synthetic, natural or mineral. Examples of suitable synthetic and natural fibres include a variety of cellulosic fibres from wood pulp through cotton, rayon, abacca (manila hemp), polyamide fibres, polyacrylonitrite fibres, acrylic fibres, polytmide fibres, polyaramid fibres, polyphenylene sulfide fibres and ~ dazole fibres. Carbon fibres may be used as well as mineral fibres such as glass and ceramic fibres. The cellulosic fibres, polyacrylonitrile fibres, and acrylic fibres are suitable for lower temperature applications, up to about 200°C. Fibres which are suitable for middle range temperature applications (Le. about 200°C to 300°C.) include the polyester fibre, polyamide fibres (e.g., Nylon 6, Nylon 66, Nylon 610), and polyphenylene sulfide fibres. Fibres suitable for high temperature applications (about 300°C and above) include the polyimide fibres, polybenzimidazole fibres, carbon fibres, fibres and ceramic fibres. Combinations of fibres may be
Metal composite
ass
gasket
used as we.. For
material
P a t e n t n u m b e r : US 5286574 P u b l i c a t i o n date: 15 F e b r u a r y 1994 ( a p p l i c a t i o n ) Inventor: Richard P Foster Applicant: H o l l l n g s w o r t h & Vose Company The invention comprises a composite gasket material which includes a fibre component and a filler component where at least about 25% weight of the filler comprises a multivalent metal cation salt and a sterically hindered dicarboxylic acid. The filler component contributes desirable mechanical properties to the composite material and enables it to demonstrate sealabiity properties and thermal stability at temperatures as high as about 200°C to 450°C. In addition, the composite preferably includes as a binder a polymeric elastomer which serves as a matrix to secure the fibre and filler
a combi-
nation of polyimide and carbon fibres may be used at a ratio of about 5:3 in favour of the polyimide fibre. Other combinations of fibres include a combination of aramid and ceramic fibres (5:3 ratio) and a combination of aramid and mineral fibres (1:1 ratio) Among the properties required of the fibres suitable for use with the composite material of the invention are the need for appropriate thermal stability, chemical resistance, tensile strength, tear resistance, and some degree of compressive strength. In addition, the fibres should be fibrillated in that they must be formable into relatively short fibres for use with the composite material of the invention, have a length in the range of 200 microns to 0.25 inch, and a diameter of 1-15 microns. The aspect ratio of these fibres shoukl generally be in the range of 5:1 to 4~.L The filler component forms the major percentage of the composite material of the invention. The filler
Sealing Technology No. 6
Seal for separation device P a t e n t n u m b e r : US 5277 807 P u b l i c a t i o n date: 11 J a n u a r y 1994 (application) I n v e n t o r : Yves Gaignet, C a t h e r i n e A Lavole Mlllipore C o r p o r a t i o n
This invention relates to a sealing means for a spiral wound filtration apparatus such as in reverse osmosis or ultrafiltration apparatus. Liquid separation apparatus such as filtration or reverse osmosis apparatus includhag a spiral wound cartridge are utiliTed in separation processes for liquids. The spiral wound cartridge is formed by interleaving one or more membrane layers, one or more spacer layers and one or more liquid irapermeable layers about a central hollow core which functions as an outlet for permeate. The cartridge includes a sealing configuration which prevents admixture of permeate with either feed or retentate, The cartridge is positioned within a housing where feed is introduced axially into the cartridge, retentate is removed axially from the cartridge and permeate is recovered by way of the central hollow core which is in fluid communication with a fluid outlet in a cover which also seals the cartridge within the housing. The feed is sealed from the retentate by a chevron-shaped elastomeric seal which is interposed between the outside surface of the cartridge and the inside surface of the housing for the cartridge in a manner to seal the feed inlet from the retentate outlet, An O-ring, spaced apart from the chevron-shaped seal, is positioned between the cover for the housing and the housing to prevent feed leakage from the housing prior to its being passed through the the chevron-shaped seal has a tendency to fail under the normal operating conditions of pressure and fluid flow primarily due to incomplete sealing at the inside wall of the housing and the seal surface contacting the inside wall of the housing, The present invention provides a seal for use in conjunction with a
12
spiral wound liquid separation device which includes a filtration membrane such as an ultrafiltration membrane or a semipermeable reverse osmosis membrane. The spiral wound separation device is positioned with a housing, and a cover for the housing that cooperates with the housing and the seal to effect desired fluid flow through the separation device. The seal prevents admixture of a feed liquid to be passed through the separation device and retentate liquid removed from the separation device, One end of the seal is adhered to the outside surface and about the entire circumference of the spiral wound separation device adjacent a fluid inlet within a cover. A second end of the seal is positioned between a top surface of the housing and the cover, The seal prevents incoming liquid feed to by-pass the separation device prior to being removed from the housing. The second end of the seal preferably has a generally O-ring shaped cross section and is maintained in a sealing relationship between the cover and the housing under a compressive force,
components of the composite. Other polymeric resins may also be added to improve resistance to oils and antifreeze. The fibre component is generally present at about 3 to 15% by weight of the entire composite material. It may be synthetic, natural or mineral. Examples of suitable synthetic and natural fibres include a variety of cellulosic fibres from wood pulp through cotton, rayon, abacca (manila hemp), polyamide fibres, polyacrylonitrite fibres, acrylic fibres, polytmide fibres, polyaramid fibres, polyphenylene sulfide fibres and ~ dazole fibres. Carbon fibres may be used as well as mineral fibres such as glass and ceramic fibres. The cellulosic fibres, polyacrylonitrile fibres, and acrylic fibres are suitable for lower temperature applications, up to about 200°C. Fibres which are suitable for middle range temperature applications (Le. about 200°C to 300°C.) include the polyester fibre, polyamide fibres (e.g., Nylon 6, Nylon 66, Nylon 610), and polyphenylene sulfide fibres. Fibres suitable for high temperature applications (about 300°C and above) include the polyimide fibres, polybenzimidazole fibres, carbon fibres, fibres and ceramic fibres. Combinations of fibres may be
Metal composite
ass
gasket
used as we.. For
material
P a t e n t n u m b e r : US 5286574 P u b l i c a t i o n date: 15 F e b r u a r y 1994 ( a p p l i c a t i o n ) Inventor: Richard P Foster Applicant: H o l l l n g s w o r t h & Vose Company The invention comprises a composite gasket material which includes a fibre component and a filler component where at least about 25% weight of the filler comprises a multivalent metal cation salt and a sterically hindered dicarboxylic acid. The filler component contributes desirable mechanical properties to the composite material and enables it to demonstrate sealabiity properties and thermal stability at temperatures as high as about 200°C to 450°C. In addition, the composite preferably includes as a binder a polymeric elastomer which serves as a matrix to secure the fibre and filler
a combi-
nation of polyimide and carbon fibres may be used at a ratio of about 5:3 in favour of the polyimide fibre. Other combinations of fibres include a combination of aramid and ceramic fibres (5:3 ratio) and a combination of aramid and mineral fibres (1:1 ratio) Among the properties required of the fibres suitable for use with the composite material of the invention are the need for appropriate thermal stability, chemical resistance, tensile strength, tear resistance, and some degree of compressive strength. In addition, the fibres should be fibrillated in that they must be formable into relatively short fibres for use with the composite material of the invention, have a length in the range of 200 microns to 0.25 inch, and a diameter of 1-15 microns. The aspect ratio of these fibres shoukl generally be in the range of 5:1 to 4~.L The filler component forms the major percentage of the composite material of the invention. The filler
Sealing Technology No. 6