Chemistry: electrical and wave energy – Apparatus – Electrophoretic or electro-osmotic apparatus
Reexamination Certificate
1999-03-12
2001-02-20
Phasge, Arun S. (Department: 1741)
Chemistry: electrical and wave energy
Apparatus
Electrophoretic or electro-osmotic apparatus
C204S633000
Reexamination Certificate
active
06190528
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to novel electrodeionization apparatus adapted to transfer ions in a liquid under the influence of an electrical field. More specifically, this invention relates to a helical eletrodeionization apparatus adapted to purify aqueous liquids to effect the production of high purity water.
BACKGROUND OF THE INVENTION
Many techniques have been used to purify and isolate liquids or to obtain concentrated pools of specific ions or molecules from a liquid mixture, such as electrodialysis, liquid chromatography, membrane filtration and ion exchange, etc. At present, a well known process is electrodeionization (EDI ). we also call it CDI (continuous deionization).
The first apparatus and method for treating liquids by electrodeionization was described by Kollsman in U.S. Pat. Nos. 2,689,826 and 2,815,320. Improved and advanced electrodeionization systems have been shown in U.S. Pat. Nos. 4,925,541, 4,931,160 and 5,316,637.
The typical structure of above-mentioned electrodeionization module is like a stacked mechanical sheet type, namely ion exchange membrane, separating wall and electrodes are processed to form a rectangle, and packed in sequence, ion exchange resin is filled up, and then is pressed to form a whole with mechanical method. It is difficult to maintain and clean the apparatus, especially one has to take apart the assembly to fill or renew the ion exchange resin. In general it needs special resin like fibre shape resin; moreover the water gathering structure of depletion compartment is more complex to process and it is easy to bring about leaking in inner part of concentration compartments and depletion compartments.
OBJECTS OF THE INVENTION
The present invention provides a helical electrodeionization apparatus for producing highly purified water. It is a technical improvement to the above-mentioned stacked mechanical sheet type.
In one aspect, the present invention has a simple structure. It is easy to process.
In another aspect, the present invention has no special requirement for ion exchange resin. It is convenient to renew and supplement.
In yet another aspect, the present invention allows solution stream to flow smoothly when it is used. It has less of pressure drop and no leaking in operation.
SUMMARY OF THE INVENTION
This present invention provides an apparatus for producing highly purified water. The technical scheme to realize the present invention is the following:
The apparatus includes anion exchange membrane and cation exchange membrane, central pipe, main component parts, outer crust and cover.
The central pipe is a metal pipe to act as an electrode and also as water distributing and gathering pipe or water gathering pipe.
The main component parts of said apparatus which has a helical cylinder structure, with the central pipe as the helical axis. One or more than one set(s) of rolled membrane bag(s) that are formed by positioning a net-separating wall between a pair cf anion exchange membrane and cation exchange membrane is rolled up to form the cylinder structure; then twine metal strip or metal wire is wound the outside of so that the cylinder structure to constitute a conductive crust, said conductive crust can be used as another electrode.
The membrane bag(s) fits tightly to the central pipe along the axial direction so that the flow passage is communicating with the central pipe through the slotted aperture(s). Fill the ion exchange resin between the adjacent membrane bag (s) to form the flow passage for getting product water.
The structure of the present invention is more simpler, and it is suited to multiple-device series operation. Besides, daily maintenance and renewal of the resin is also more convenient than prior art.
These and other features, aspects, and advantages of the present invention will be better understood from the following drawings, description and appended claims.
REFERENCES:
patent: 5292422 (1994-03-01), Liang et al.
Li Xiang
Luo Gou-Lin
Phasge Arun S,.
Quarles & Brady LLP
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