Patent US3756408A successfully refreshed from Google Patents.
US3756408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation system
Assignee: Veolia WTS Solutions USA Inc
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Filing: 1972-06-15
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Granted: 1973-09-04
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Expires: 1992-06-15
Abstract
Abstract An improved separation system for reclaiming pollutant material from a waste or rinse solution including a solvent separating means and a concentrate valve and valve control means for controlling the removal of concentrate from the system and maintaining the concentration of the concentrate solution relatively constant despite a varying feed concentration.
Inventors
- 👤 D Spatz
- 👤 A Nieland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/12; B01D61/025; C; C02; C02F; C02F1/00; C02F1/44; C02F1/441; B01D2311/00; B01D2311/25; B01D2315/00; B01D2315/12; C02F2209/00; C02F2209/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
258 words
A separation and reclamation system for producing a concentrate solution having a relatively constant solute concentration from a feed solution having a variable solute concentration comprising: solvent separation means having an inlet for introducing feed solution into said solvent separation means and an outlet for removing concentrate solution from said solvent separating means, said solvent separating means further including a semipermeable membrane for preferentially passing the solvent of the solution in said solvent separation means; a recycle connected with said outlet for recycling a portion of said concentrate solution through said solvent separation means; a concentrate valve connected with said outlet for removing a portion of said concentrate solution from said system and for varying the rate at which the concentrate solution is removed from said system, said recycle and said concentrate valve further functioning to maintain sufficient flow through said outlet and over said semipermeable membrane so as to limit precipitation of solids on said membrane; and a valve control means for controlling said concentrate valve including a concentration sensing means for detecting the relative solute concentration of the solution in said outlet between said solvent separation means and said concentrate valve, means for opening said concentrate valve when the solute concentration in said outlet is greater than a preselected value, the extent to which said valve is opened being proportional to the extent to which the solute concentration in said outlet is greater than said preselected value, and for closing said concentrate valve when the solute concentration in said outlet is less than said preselected value.
Claim 2
Dependent Claim
258 words
A separation and reclamation system for producing a concentrate solution having a relatively constant solute concentration from a feed solution having a variable solute concentration comprising: solvent separation means having an inlet for introducing feed solution into said solvent separation means and an outlet for removing concentrate solution from said solvent separating means, said solvent separating means further including a semipermeable membrane for preferentially passing the solvent of the solution in said solvent separation means; a recycle connected with said outlet for recycling a portion of said concentrate solution through said solvent separation means; a concentrate valve connected with said outlet for removing a portion of said concentrate solution from said system and for varying the rate at which the concentrate solution is removed from said system, said recycle and said concentrate valve further functioning to maintain sufficient flow through said outlet and over said semipermeable membrane so as to limit precipitation of solids on said membrane; and a valve control means for controlling said concentrate valve including a concentration sensing means for detecting the relative solute concentration of the solution in said outlet between said solvent separation means and said concentrate valve, means for opening said concentrate valve when the solute concentration in said outlet is greater than a preselected value, the extent to which said valve is opened being proportional to the extent to which the solute concentration in said outlet is greater than said preselected value, and for closing said concentrate valve when the solute concentration in said outlet is less than said preselected value.
Claim 3
Dependent Claim
16 words
The improved separation system of claim 1 wherein said concentration sensing means includes a conductivity probe.
Claim 4
Dependent Claim
18 words
The improved separation system of claim 1 wherein said concentrate valve is opened and closed by air pressure.
Claim 5
Dependent Claim
40 words
The improved separation system of claim 3 wherein said valve control means further includes a conductivity monitor electrically connected with said conductivity probe and having an electrical current output proportional to the concentration of the solute in said separating means.
Claim 6
Dependent Claim
33 words
The improved separation system of claim 4 wherein said valve control means further includes electro-pneumatic transducer adapted to convert the electrical current signal from said conductivity monitor to a proportional air pressure signal.
Claim 7
Dependent Claim
39 words
The improved separation system of claim 5 wherein said valve control means further includes a pneumatic amplifier for amplifying the air pressure signal from said transducer to an air pressure signal capable of opening and closing said concentrate Valve.
Claim 8
Dependent Claim
20 words
The improved separation system of claim 1 wherein said solvent separation means includes a plurality of reverse osmosis membrane modules.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |