US3899294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for automatic feed forward control of effluent ph
Assignee: Olin Corp
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Filing: 1974-07-18
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Granted: 1975-08-12
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Expires: 1994-07-18
Abstract
Abstract An indirect method for automatically controlling pH of an effluent stream is provided utilizing a feed-forward method of control wherein flow rate information gathered from an upstream titration of effluent with a rapidly reacting neutralizing agent is utilized to control the flow of a stream of neutralizing agent into the effluent stream at a point downstream.
Inventors
- 👤 Peter G Magiros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:41
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
A FEED FORWARD METHOD FOR AUTOMATICALLY CONTROLLING THE A. CONTINUOUSLY TITRATING UPSTREAM A SLIP STREAM OF SAID EFFLUENT TO A PH CORRESPONDING TO A SELECTED SET POINT ON A PH CONTROLLER HAVING PROPORTIONAL AND INTEGRAL ESPONSE WITH A TITRATING STREAM OF RAPIDLY REACTING NEUTRILIZING AGENT, THE FLOW OF EITHER SAID SLIP STREAM OR SAID TITRATING STREAM BEING CONSTANT WHILE THE FLOW OF THE OTHER IS AUTOMATICALLY REGULATED, B. CONTINUOUSLY MONITORING THE INSTANTANEOUS FLOW RATE OF THE STREAM WHOSE FLOW RATE IS AUTOMATICALLY REGULATED AND TRANSMITTING A SIGNAL A, CORRESPONDING TO THE FLOW RATE OF SAID REGULATED STREAM, C. CONTINUOUSLY MONITORING THE INSTANTANEOUS FLOW RATE OF SAID EFFLUENT STREAM AND TRANSMITTING A SIGNAL B CORRESPONDING TO THE FLOW RATE OF SAID EFFLUENT STREAM, D. CONDITIONING SIGNALS A AND B TO AUTOMATICALLY PROVIDE A SIGNAL C PRODUCING A VARIABLE SET POINT ON A DILUTION CONTROLLER, SAID SET POINT CONTROLLING THE INSTANTANEOUS FLOW RATE OF A STREAM OF NEUTRALIZING AGENT TO BE ADDED TO SAID EFFUENT STREAM TO PRODUCE AN OUTFALL PH SUBSTANTIALLY CORRESPONDING TO THE PH REPRESENTED BY SAID SELECTED SET POINT.
Claim 2
Dependent Claim
180 words
A FEED FORWARD METHOD FOR AUTOMATICALLY CONTROLLING THE A. CONTINUOUSLY TITRATING UPSTREAM A SLIP STREAM OF SAID EFFLUENT TO A PH CORRESPONDING TO A SELECTED SET POINT ON A PH CONTROLLER HAVING PROPORTIONAL AND INTEGRAL ESPONSE WITH A TITRATING STREAM OF RAPIDLY REACTING NEUTRILIZING AGENT, THE FLOW OF EITHER SAID SLIP STREAM OR SAID TITRATING STREAM BEING CONSTANT WHILE THE FLOW OF THE OTHER IS AUTOMATICALLY REGULATED, B. CONTINUOUSLY MONITORING THE INSTANTANEOUS FLOW RATE OF THE STREAM WHOSE FLOW RATE IS AUTOMATICALLY REGULATED AND TRANSMITTING A SIGNAL A, CORRESPONDING TO THE FLOW RATE OF SAID REGULATED STREAM, C. CONTINUOUSLY MONITORING THE INSTANTANEOUS FLOW RATE OF SAID EFFLUENT STREAM AND TRANSMITTING A SIGNAL B CORRESPONDING TO THE FLOW RATE OF SAID EFFLUENT STREAM, D. CONDITIONING SIGNALS A AND B TO AUTOMATICALLY PROVIDE A SIGNAL C PRODUCING A VARIABLE SET POINT ON A DILUTION CONTROLLER, SAID SET POINT CONTROLLING THE INSTANTANEOUS FLOW RATE OF A STREAM OF NEUTRALIZING AGENT TO BE ADDED TO SAID EFFUENT STREAM TO PRODUCE AN OUTFALL PH SUBSTANTIALLY CORRESPONDING TO THE PH REPRESENTED BY SAID SELECTED SET POINT.
Claim 3
Dependent Claim
65 words
The process of claim 1 wherein pH of a mixture resulting from said titration is continuously measured, a signal E, representing said pH measurement is transmitted to said pH controller, signal E is compared with the selected set point on said pH controller and the flow of said automatically controlled stream is continuously adjusted for any difference between signal E and the selected set point.
Claim 4
Dependent Claim
64 words
The process of claim 2 wherein the flow rate of said stream of neutralizing agent is continuously monitored, a signal D representing said flow rate is transmitted to said dilution controller, signal D compared with the variable set point on said dilution controller and the flow rate of said neutralizing agent continuously modified for any difference between signal D and said variable set point.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein signal B is first modified manually or automatically by a signal representing variations occurring in concentration of said neutralizing agent.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein said variation is determined by a direct measurement of said neutralizing agent.
Claim 7
Dependent Claim
16 words
The process of claim 4 wherein said variation is determined by a measurement of outfall pH.
Claim 8
Dependent Claim
28 words
The process of claim 4 wherein said titratinG stream comprises an aqueous stream of rapidly acting neutralizing agent selected from the group consisting of Potassium and Sodium Hydroxide.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein said stream of neutralizing agent is an aqueous slurry of lime.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein said titrating stream comprises an aqueous stream of rapidly acting neutralizing agent selected from the group consisting of Potassium and Sodium Hydroxide.
Claim 11
Dependent Claim
17 words
The process of claim 9 where said stream of neutralizing agent is an aqueous slurry of lime.
References Cited (Backward Citations)
US3791793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |