Electrolytic device for contaminant removal and method

Patent metadata

Field	Value
Publication number	US-9931585-B2
Application number	US-201414260095-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	Apr 23, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

An electrolytic device comprising a housing includes at least first and second adjacent liquid flow-through channels. A barrier impermeable to ion flow and to bulk liquid flow is disposed between the first and second channels. A first electrode assembly is disposed adjacent to one end of the channels and a second electrode assembly is disposed adjacent the other end of the channels.
Also, a contaminant removal method using the above electrolytic device. A first aqueous stream including contaminants flows through the first channel while passing a current between the first and second electrode assemblies to remove contaminants. Effluent from the first channel flows, with or without further treatment, through the second channel while passing current between said first and second electrode assemblies to remove further contaminants.

First claim

What is claimed is:

1. An electrolytic device comprising
a housing including at least first and second adjacent liquid flow-through channels, each channel having an upstream end and a downstream end,
an inlet adjacent said upstream end of each channel and an outlet adjacent said downstream end of each channel,
said upstream ends being adjacent to each other and said downstream ends being adjacent to each other;
a barrier impermeable to ion flow and to bulk liquid flow disposed between said first and second channels;
a first electrode assembly disposed adjacent to both of said upstream ends; and
a second electrode assembly disposed adjacent to both of said downstream ends, in which said first electrode assembly and said second electrode assembly are configured to apply an electric field a) between said first electrode assembly and second electrode assembly, and b) through said first and second channels.

2. The electrolytic device of claim 1 in which said first channel outlet is in fluid communication with said second channel inlet.

3. The electrolytic device of claim 1 further comprising a first ion exchange barrier assembly, which permits ion transport and blocks bulk liquid flow disposed adjacent both of said upstream ends, between said first electrode assembly and both of said upstream ends.

4. The electrolytic device of claim 3 in which said first ion exchange barrier assembly comprises a first barrier portion adjacent to said upstream end of said first channel and a second barrier portion adjacent to said upstream end of said second channel.

5. The electrolytic device of claim 3 further comprising a second ion exchange barrier assembly, which permits ion transport and blocks bulk liquid flow disposed adjacent said downstream ends, between said second electrode assembly and both of said downstream ends.

6. The electrolytic device of claim 5 in which said first and second ion exchange barrier assemblies comprise exchangeable ions of a same charge.

7. The electrolytic device of claim 6 in which said first and second ion exchange barrier assemblies comprise exchangeable ions of opposite charge.

8. The electrolytic device of claim 1 further comprising flow-through ion exchange medium in said first and second channels.

9. The electrolytic device of claim 1 in which said first and second electrode assemblies are connected to a single power supply.

10. The electrolytic device of claim 1 in which said first and second electrode assemblies comprise a first single continuous electrode and a second single continuous electrode, respectively, said first single continuous electrode is adjacent to both of said upstream ends of said first and second channels, and said second single continuous electrode is adjacent to both of said downstream ends of said first and second channels.

11. The electrolytic device of claim 1 in which said first electrode assembly comprises a first electrode portion adjacent to said upstream end of said first channel and a second electrode portion spaced from said first electrode portion and adjacent to said upstream end of said second channel.

12. The electrolytic device of claim 11 in which said second electrode assembly comprises a third electrode portion adjacent said downstream end of said first channel and a fourth electrode portion spaced from said third electrode portion and adjacent to said downstream end of said second channel.

13. A contaminant removal method using an electrolytic device comprising
a housing including at least first and second adjacent liquid flow-through channels, each channel having an upstream end and a downstream end,
an inlet adjacent said upstream end of each channel and an outlet adjacent said downstream end of each channel,
said upstream ends being adjacent to each other and said downstream ends being adjacent to each other;
a barrier impermeable to ion flow and to bulk liquid flow disposed between said first and second channels;
a first electrode assembly disposed adjacent to both said upstream ends; and
a second electrode assembly adjacent to both of said downstream ends of said first and second channels, in which said first electrode assembly and said second electrode assembly are configured to apply an electric field a) between said first electrode assembly and second electrode assembly, and b) through said first and second channels; said method comprising
flowing a first aqueous stream including contaminants to said inlet of said first channel and therethrough to said outlet thereof while passing a current between said first and second electrode assemblies to remove contaminants from said first aqueous liquid stream;
flowing said first aqueous liquid stream from said first channel, with or without further treatment, to said second channel inlet therethrough to said outlet thereof while passing current between said first and second electrode assemblies to remove further contaminants from said first aqueous liquid stream.

14. The method of claim 13 in which said first aqueous liquid stream is further treated prior to flowing to said second channel inlet, said further treatment comprising flowing said first aqueous liquid stream through an electrolytic eluent generator and generating eluent therein and flowing said generated eluent to said second channel inlet.

15. The method of claim 13 in which said electrolytic device further comprising flow-through ion exchange medium in said first and second flow-through channels, said ion exchange material in said first channel including exchangeable cations and anions, said electrolytic device further comprising a first ion exchange barrier assembly which permits ion transport and blocks bulk liquid flow disposed adjacent said upstream ends between said first electrode assembly and said upstream ends, and a second ion exchange barrier assembly which permits ion transport and blocks bulk liquid flow disposed adjacent both of said downstream ends between said second electrode assembly and said downstream ends; wherein said method further comprises removing anion and cation contaminants from said flowing aqueous stream in said first channel.

16. The method of claim 15 in which said first and second ion exchange barrier assemblies include exchangeable ions of a same charge.

Assignees

• Dionex Corp

Inventors

• Srinivasan Kannan

Classifications

• B01D15/367 Primary

  Ion-suppression · CPC title

• C25F1/00

  Electrolytic cleaning, degreasing, pickling or descaling · CPC title

• C25F7/00

  Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects (for both electrolytic coating and removal C25D); Servicing or operating · CPC title

• B01D15/361

  Ion-exchange · CPC title

• B01D61/44

  Ion-selective electrodialysis · CPC title