EP0032317A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method of liquid filtration
Assignee: Apv-Carlson Ltd
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Filing: 1980-12-30
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Granted: —
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Expires: 2000-12-30
Abstract
Abstract A method of liquid filtration comprises providing an electrically conducting high surface area bed which has been electrically charged and passing the liquid to be filtered therethrough to cause electrosorption or adsorption of contaminants therein by the bed. The bed can be charged by application of a potential thereto or passage of a current therethrough. Regeneration of the bed can be achieved by changing the electrical potential of the bed and passing a cleansing liquid therethrough. This causes the contaminants retained within the bed to be desorbed, discharged into the cleansing liquid and thereby removed from the bed.
Inventors
- 👤 Ronald Shackleton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:59
CPC Classifications
B; B01; B01D; B01D15/00; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024; C; C12; C12H; C12H1/00; C12H1/02; C12H1/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method of liquid filtration comprising the steps of providing an electrically conducting high surface area bed, which is electrically charged, passing the liquid to be filtered through the bed, and collecting the filtrate as it egresses from the bed, characterised in that the bed can be regenerated by changing the electrical potential of the bed and passing a cleansing liquid through the bed whereby the filtered out residue is discharged into the cleansing liquid and thereby removed from the bed.
Claim 2
Independent Claim
81 words
A method of liquid filtration comprising the steps of providing an electrically conducting high surface area bed, which is electrically charged, passing the liquid to be filtered through the bed, and collecting the filtrate as it egresses from the bed, characterised in that the bed can be regenerated by changing the electrical potential of the bed and passing a cleansing liquid through the bed whereby the filtered out residue is discharged into the cleansing liquid and thereby removed from the bed.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1, characterised in that the bed is electrically charged by the imposition of an electrical potential thereto or by the passage of a current therethrough.
Claim 4
Dependent Claim
39 words
A method as claimed in claim 2, in which a constant electrical potential is applied to the bed during filtration, and characterised in that the magnitude of the potential is changed when it is desired to regenerate the bed.
Claim 5
Dependent Claim
38 words
A method as claimed in claim 2, in which an electrical potential is applied to the bed during filtration and characterised in that the polarity of the potential is reversed when it is desired to regenerate the bed.
Claim 6
Dependent Claim
45 words
A method as claimed in claim 2, in which an oscillating potential is applied to the bed over a predetermined range and characterised in that the magnitude of the range of oscillation of the potential is altered when it is desired to regenerate the bed.
Claim 7
Dependent Claim
41 words
A method as claimed in claim 5, in which during filtration the predetermined range of oscillation is limited to a single polarity of potential and characterised in that during regeneration the range of oscillation is altered to include the reverse polarity.
Claim 8
Independent Claim
27 words
A method as claimed in any one of claims 2 to 6, characterised in that the cleansing liquid is the same as the liquid to be filtered.
Claim 9
Independent Claim
57 words
A method as claimed in any one of claims 1 to 6, characterised in that the cleansing liquid has a different composition, ionic strength, or pH value from the liquid being filtered whereby on passage of the cleansing liquid through the bed the electrical potential of the bed changes to cause or assist regeneration of the bed.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 8, characterised in that the cleansing liquid comprises a solution of sodium sulphate.
Claim 11
Independent Claim
25 words
A method as claimed in any one of claims 1 to 9, characterised in that the high surface area bed comprises packed carbon or graphite.
Claim 12
Dependent Claim
24 words
A method as claimed in claim 10, characterised in that the carbon or graphite has been pretreated by having been heated in sulphuric acid.
References Cited (Backward Citations)
No citation records indexed.
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