Method for preparing an ion exchange media
AssigneeAquatech International Corporation
InventorsRavi Chidambaran, Pavan Raina, Devesh Sharma, Narendra Singh Bisht
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Abstract
This invention presents an ion exchange media including a plurality of cation exchange zones and anion exchange zones in flow paths that are contained in a substantially nonporous resin transport framework. During electrodeionization and other potential applications the ion exchange media of the invention prevents unfavorable water splitting at resin-membrane interfaces and encourages water splitting at resin-resin interfaces where the water splitting may be constructively used to regenerate the resin.
Claims17
An ion exchange media comprising at least one flow path, said flow path comprising a plurality of alternating cation exchange zones and anion exchange zones, and said flow path being within a substantially nonporous resin transport framework.
An ion exchange media comprising a substantially nonporous resin transport framework comprised of an anion resin side and a cation resin side that meet at an interface, further comprising a plurality of flow paths extending longitudinally along the interface along the entire length of the resin transport framework, said flow paths comprising alternating areas of cation resin and anion resin in contact with said nonporous resin transport framework.
A method for constructing an ion exchange media, comprising the steps of
- 1) providing a nonporous cation resin side, wherein said nonporous cation resin side is formed by the steps of
- a) providing a nonporous cation resin,
- b) drying said cation resin,
- c) grinding said cation resin,
- d) optionally sieving said cation resin,
- e) impregnating said cation resin into a binding medium to form a cation resin mixture,
- f) partially drying said cation resin mixture,
- g) shaping said cation resin mixture, and
- h) drying said cation resin mixture;
- 2) providing a nonporous anion resin side, wherein said nonporous anion resin side is formed by the steps of
- a) providing a nonporous anion resin,
- b) drying said anion resin,
- c) grinding said anion resin,
- d) optionally sieving said anion resin,
- e) impregnating said anion resin into a binding medium to form an anion resin mixture,
- f) partially drying said anion resin mixture,
- g) shaping said anion resin mixture, and
- h) drying said anion resin mixture;
- 3) combining said anion resin side and said cation resin side such that they meet at an interface to form a nonporous resin transport framework, said transport framework including at least one void extending longitudinally through said transport framework at the interface and along the length of the transport framework;
- and
- 4) filling said void with a plurality of alternating layers of a porous second cation resin and a porous second anion resin to form at least one flow path.
A method for limiting water splitting to resin-resin bipolar interfaces during electrodeionization of water, comprising limiting flow of water to a flow path, said flow path comprising alternating cation resin zones and anion resin zones contained within a substantially nonporous resin transport framework comprised of an anion resin side and a cation resin side.
Dependencies are inferred from the claim text.