Self sealing membrane contactor with PTFE tubular membranes
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-024/00
B01D-027/00
B01D-033/00
B01D-025/00
B01D-036/00
B01D-063/06
B01D-071/34
B01D-071/36
출원번호
US-0200611
(2011-09-27)
등록번호
US-9061251
(2015-06-23)
발명자
/ 주소
Hobbs, Kenneth Donald
Jerman, Robert Edward
Wolanski, Charles Edward
출원인 / 주소
Markel Corporation
대리인 / 주소
Cohen, Leslie A.
인용정보
피인용 횟수 :
0인용 특허 :
22
초록▼
A tubular membrane module and its method of manufacture are disclosed wherein tubular membranes form an interference self-sealing fit with hard tube sheets with the aid of a hard hollow mandrel inserted at the end of the tubular membranes. The tubular membranes are comprised of porous, compressible
A tubular membrane module and its method of manufacture are disclosed wherein tubular membranes form an interference self-sealing fit with hard tube sheets with the aid of a hard hollow mandrel inserted at the end of the tubular membranes. The tubular membranes are comprised of porous, compressible PTFE and/or fluorocopolymers. The self-sealing method described herein requires no heat treatment, allows for ease of manufacture without destruction of the tubular membranes and without the processing complexity of utilizing any additional potting agent, extrusion, or chemical cross-linking of any polymeric adhesives. The self sealing PTFE tubular membranes have superb chemical resistance and temperature resistance, and through the benefits of this invention, offer higher pullout resistance than typically observed with potting materials such as polyurethane and epoxy. In addition, the self-sealing method is reversible and non-destructive (whereas chemical potting and sealing methods using heat are not), as one can easily remove one or more damaged tubes and replace them.
대표청구항▼
1. A tubular membrane module, comprising at least one tube sheet with one or more holes disposed therein; one or more individual compressible polytetrafluoroethylene tubular membranes each having first ends disposed within a respective hole of the tube sheet; one or more insertable hollow mandrels w
1. A tubular membrane module, comprising at least one tube sheet with one or more holes disposed therein; one or more individual compressible polytetrafluoroethylene tubular membranes each having first ends disposed within a respective hole of the tube sheet; one or more insertable hollow mandrels which have an outer flange protruding from a top lip of the mandrel and at least one ridge cut circumstantially projecting out from the body of the mandrel inserted into the first ends of the tubular membranes, with the first ends of the tubular membranes held in place in the tube sheet by a physical interference fit created between the insertable hollow mandrels and tube sheet; and, a containment shell in which the tube sheet and tubular membranes are disposed. 2. A tubular membrane module according to claim 1, wherein the one or more individual polymer tubular membranes comprise porous membranes. 3. A tubular membrane module according to claim 1, wherein the one or more holes and one or more insertable hollow mandrels are dimensioned relative to one another to provide compression of the tubular membranes ends by the physical interference fit between the insertable hollow mandrels and tube sheet. 4. A tubular membrane module according to claim 3, wherein the tubular membranes are reversibly compressible to permit at least partial recovery to the membranes' original state following removal of the compression of the tubular membrane ends at the physical interference fit created between the insertable hollow mandrel and tube sheet. 5. A tubular membrane module according to claim 1, wherein the diameters of one or more holes in the tube sheet are greater than the outer diameters of the tubular membranes. 6. A tubular membrane module according to claim 1, wherein the diameter of the insertable mandrels is less than twice the wall thickness of the tubular membranes. 7. A tubular membrane module according to claim 1, wherein the diameter of the insertable mandrels is less than the diameter of the tube sheet holes minus twice the wall thickness of the membrane tubular membranes when attached to the tube sheet. 8. A tubular membrane module according to claim 1, wherein the containment shell comprises perfluorinated homopolymers of polytetrafluoroethylene, fluorinated homopolymers of polyvinylidene fluoride, hexafluoropropylene, perfluoropropylvinyl ether, chlorotrifluoroethylene, alkoxy, partially fluorinated ethylene, fluorinated ethylene propylene, or combinations thereof. 9. A tubular membrane module according claim 1, wherein the containment shell comprises stainless steel. 10. A tubular membrane module according to claim 1, wherein the containment shell comprises polyvinylchloride, polysulfone, polyethersulfone, polycarbonate, polyether ether ketone, polyetherketone, polyamides, polyimides, or combinations thereof. 11. A tubular membrane module according to claim 1, wherein the tube sheet comprises polyvinylidene fluoride. 12. A tubular membrane module according to any one of the claim 1, wherein the tube sheet comprises plastics, polymer composites, ceramics, metals, or combinations thereof. 13. A tubular membrane module according to claim 1, wherein the tube sheet comprises stainless steel. 14. A tubular membrane module according to claim 1, wherein the insertable hollow mandrels comprise stainless steel. 15. A tubular membrane module according to claim 1, wherein the insertable hollow mandrels comprise plastics, plastic composites, ceramics, metals, or combinations thereof. 16. A tubular membrane module according to claim 1, wherein the durometer hardness of the tube sheet is greater than the durometer hardness of the tubular membranes. 17. A tubular membrane module according to claim 1, wherein durometer hardness of the insertable hollow mandrels is greater than the durometer hardness of the tube sheet or the tubular membranes. 18. A tubular membrane module according to claim 1, wherein the insertable hollow mandrel has a durometer hardness less than the durometer hardness of the tube sheet and greater than the durometer hardness of the tubular membranes. 19. A tubular membrane module according to claim 1, wherein the insertable hollow mandrels contain a ridge that is coplanar to the inner face of the tube sheet on complete insertion into the tube sheet. 20. A tubular membrane module according to claim 19, wherein the ridge on the insertable hollow mandrels is frusto-conical. 21. A method for producing a tubular membrane module comprising at least one tube sheet with one or more holes disposed therein; one or more individual compressible polytetrafluoroethylene tubular membranes each having first ends disposed within a respective hole of the tube sheet; one or more insertable hollow mandrels, which have an outer flange protruding from a top lip of the mandrel and at least one ridge cut circumstantially projecting out from the body of the mandrel, with said mandrel inserted into the first ends of the tubular membranes, with the first ends of the tubular membranes held in place in the tube sheet by a physical interference fit created between the insertable hollow mandrels and tube sheet; and, a containment shell in which the tube sheet and tubular membranes are disposed. 22. The method according to claim 21, wherein the diameter of the insertable hollow mandrels is less than twice the wall thickness of the tubular membranes and the diameter of the insertable hollow mandrels is less than the diameter of the tube sheet holes minus twice the diameter of the wall thickness of the compressed tubular membranes. 23. The method according to claim 21, wherein the containment shell comprises perfluorinated homopolymers of polytetrafluoroethylene, fluorinated homopolymers of polyvinylidene fluoride, perfluorinated copolymers of tetrafluoroethylene and hexafluoropropylene, copolymers of tetrafluoroethylene and perfluoropropylvinyl ether, copolymers of tetrafluoroethylene and chlorotrifluoroethylene, copolymers of tetrafluoroethylene and alkoxy, partially fluorinated copolymers of ethylene and tetrafluoroethylene, ethylene and fluorinated ethylene propylene, perfluorinated and similar materials, or polyvinylchloride, polysulfone, polyethersulfone, polycarbonate, polyether ether ketone, polyetherketone, polyamides, or polyimides, or stainless steel, or combinations thereof. 24. The method according to claim 21, wherein the step of inserting the one or more hollow mandrels comprises reversibly inserting the one or more hollow mandrels. 25. The method according to claim 21, wherein the self sealed tubular membranes can be removed by physical means without damaging the integrity of the tubular membrane module. 26. The method according to claim 21, wherein the at least one self sealed tubular membrane can be replaced with another self-sealed tubular membrane without damaging the integrity of the tubular membrane module. 27. The method according to claim 21, comprising inserting a respective alignment rod into each of the holes of the tube sheet and into the associated polymer tubular membrane installed in each hole to align each polymer tubular membrane along the length of the containment shell, and placing an additional tube sheet with one or more holes at a second end of the tube sheet and orienting the additional tube sheet such that the holes of the additional tube sheet are aligned to respective ones of the aligned polymer tubular membranes.
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