Spiral wound membrane element and treatment of SAGD produced water or other high temperature alkaline fluids
A spiral wound module is suitable for use with high temperature water that is also very alkaline or has a high pH, for example SAGD produced water. The module uses a polyamide-based membrane with a polysulfone or polyethersulfone backing material. For other components, the module uses primarily one or more of, EPDM; polyamide; polyphenylene oxide; polyphenylene sulfide; polysulfone; polyethersulfone; polysulfonamide; polyvinylidene fluoride; mylar; fiberglass; and, epoxy. Polyester is not used. Polypropylene is not used for the feed spacer. For example, a module may use a PVDF feed spacer, a nylon permeate spacer and a polysulfone center tube. The center tube may be provided with 4 rows of 0.063″ diameter holes and be rolled under high tension.
1. A spiral wound membrane module comprising,
a membrane envelope comprising a membrane material and a permeate spacer;
a feed spacer adjacent the membrane envelope;
a center tube, wherein the membrane envelope and feed spacer are wrapped around the center tube; and,
an anti-telescoping device attached to the center tube beside the membrane envelope and feed spacer,
wherein the permeate spacer, center tube, and anti-telescoping device are each made primarily of a material, or a blend of materials, chosen from the set of, polyphenylene oxide; polyamide; polyphenylene sulfide; polysulfone; polyethersulfone; polysulfonamide; and, polyvinylidene fluoride; and
wherein the feed spacer is made primarily of PVDF.
2. The spiral wound membrane module of claim 1 wherein the permeate spacer, center tube, and anti-telescoping device are each made primarily of a material, or a blend of materials, chosen from the set of, polyamide; polysulfone; and, PVDF.
3. The spiral wound membrane module of claim 1 wherein the permeate spacer is made primarily of nylon 6-6 and the center tube is made primarily of polysulfone.
4. The spiral wound membrane module of claim 3 wherein the anti-telescoping device is made primarily of polysulfone.
5. The spiral wound membrane module of claim 1 wherein the membrane material consists essentially of a polyamide based separation layer and a polysulfone based support layer.
6. The spiral wound membrane module of claim 1 wherein the permeate spacer is made essentially without polyester.
7. The spiral wound membrane module of claim 6 made essentially without polyester.
8. The spiral wound membrane module of claim 1 wherein the feed spacer is made essentially without polypropylene.
9. The spiral wound membrane module of claim 1 further comprising an outer cover constructed of fiberglass embedded in epoxy resin.
10. The spiral wound membrane module of claim 1 wherein the center tube is joined to the anti-telescoping device by an epoxy resin adhesive.
11. The spiral wound membrane module of claim 1 wherein the membrane enveloped is made of a folded sheet of membrane material, further comprising a creased sheet of mylar over the fold in the membrane material.
12. The spiral wound membrane module of claim 1 made essentially without chlorinated polyvinyl chloride (CPVC).
13. The spiral wound membrane module of claim 1 made essentially without polyphenylene oxide.
14. The spiral wound membrane module of claim 1 made essentially without ABS.
15. The spiral wound membrane module of claim 1 wherein the center tube is perforated with holes having a diameter of 0.1″ or less, or other perforations of an equivalent area.
16. The spiral wound membrane module of claim 15 having 3 or more rows of the holes.
17. A process comprising flowing produced water from a steam assisted gravity drainage operation through a spiral wound membrane module according to claim 1 .
18. The process of claim 17 wherein the produced water is maintained at a temperature of 90 degrees Celcius or more and further comprising a step of increasing the pH of the produced water to 9.5 or more before flowing it through the spiral wound membrane module.
19. The process of claim 17 further comprising a step of cleaning the spiral wound membrane module with a cleaning solution having a pH of 9.5 or more and a temperature of 90 degrees Celcius or more.
20. The process of claim 17 further comprising a step of using chemical oxidation or electromagnetic treatment to degrade or destroy organic contaminants in the produced water before flowing it through the spiral wound membrane module.
21. The process of claim 18 wherein the produced water is a steam generation blowdown stream.
22. The process of claim 17 further comprising flowing permeate from the spiral wound membrane module to a steam boiler or generator.