Patent US3864346A successfully refreshed from Google Patents.
US3864346A
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Means and method for controlling the strength of acid in an alkylation unit
Assignee: Texaco Inc
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Filing: 1972-08-21
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Granted: 1975-02-04
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Expires: 1992-08-21
Abstract
Abstract The strength of acid in an alkylation unit is controlled by a system using a signal corresponding to the anticipated demand on the acid by the reaction of olefin and isoparaffin in the presence of the acid. The reaction weakens the acid so that it is necessary to replace some of the weakened acid with fresh acid to maintain a desired acid strength. The control system includes apparatus sampling the olefin and isoparaffin entering the alkylation unit which provides a signal corresponding to the percent volume of acid degrading constituents formed during alkylation. A water analyzer samples the olefin and isoparaffin and provides a signal corresponding to their water content. Signals corresponding to sensed flow rates of fresh and discharged acid entering and leaving, respectively, the alkylation unit and of the olefin and isosparaffin are provided by sensors. A control circuit using analog computers develop the control signal in accordance with the signals from the sensors, the volume signal and the signal from the analyzer and equations hereinafter disclosed. The control signal ils applied to a flow recorder controller which controls the flow rate of the fresh acid entering the alkylation unit so as to maintain the desired acid strength.
Inventors
- 👤 Edward T Child
- 👤 John E May
- 👤 William D Stephanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:26
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
232 words
A system for controlling the strength of an acid in an alkylation unit wherein an isoparaffin is reacted with olefin in the presence of the acid to provide an acid-hydrocarbon mixture to a settler where the hydrocarbon is separated from the acid to provide a hydrocarbon product and a portion of the acid is recycled while the remaining acid is discharged from the alkylation unit and wherein fresh acid is added to the recycle acid to affect the strength of the acid, comprising means for controlling one acid flow rate of the fresh acid and discharge acid flow rates relative to the other acid flow rate of the fresh acid and discharge acid flow rates in accordance with a control signal so as to Control the strength of the acid, means for sensing the water content of the olefin and the isoparaffin and providing a signal corresponding thereto, means for determining the composition of the olefin and providing a corresponding composition signal, means for sensing the flow rate of the olefin and providing a signal corresponding thereto, means for sensing the flow rates of the fresh acid and the discharge acid and providing signals corresponding thereto, and means connected to the determining means and to all of the sensing means for providing the control signal to the control means in accordance with the signals from the sensing means and the determining means.
Claim 2
Independent Claim
232 words
A system for controlling the strength of an acid in an alkylation unit wherein an isoparaffin is reacted with olefin in the presence of the acid to provide an acid-hydrocarbon mixture to a settler where the hydrocarbon is separated from the acid to provide a hydrocarbon product and a portion of the acid is recycled while the remaining acid is discharged from the alkylation unit and wherein fresh acid is added to the recycle acid to affect the strength of the acid, comprising means for controlling one acid flow rate of the fresh acid and discharge acid flow rates relative to the other acid flow rate of the fresh acid and discharge acid flow rates in accordance with a control signal so as to Control the strength of the acid, means for sensing the water content of the olefin and the isoparaffin and providing a signal corresponding thereto, means for determining the composition of the olefin and providing a corresponding composition signal, means for sensing the flow rate of the olefin and providing a signal corresponding thereto, means for sensing the flow rates of the fresh acid and the discharge acid and providing signals corresponding thereto, and means connected to the determining means and to all of the sensing means for providing the control signal to the control means in accordance with the signals from the sensing means and the determining means.
Claim 3
Independent Claim
177 words
A method for controlling the strength of an acid in an alkylation processing unit wherein an isoparaffin is reacted with olefin in the presence of the acid to provide an acid-hydrocarbon mixture to a settler where the hydrocarbon is separated from the acid to provide a hydrocarbon product and a portion of the acid is recycled while the remaining acid is discharged from the alkylation unit and wherein fresh acid is added to the recycle acid to affect the strength of the acid, which comprises determining the composition of the olefin, determining the water content of the olefin and isoparaffin, sensing the flow rates of the olefin and isoparaffin, the fresh acid and the discharge acid, and controlling one acid flow rate of the fresh acid and the discharge acid flow rates relative to the other acid flow rate of the fresh acid and discharge acid flow rates in accordance with the composition of the olefin, the water content of olefin and isoparaffin and the sensed flow rates so as to control the strength of the acid.
Claim 4
Independent Claim
177 words
A method for controlling the strength of an acid in an alkylation processing unit wherein an isoparaffin is reacted with olefin in the presence of the acid to provide an acid-hydrocarbon mixture to a settler where the hydrocarbon is separated from the acid to provide a hydrocarbon product and a portion of the acid is recycled while the remaining acid is discharged from the alkylation unit and wherein fresh acid is added to the recycle acid to affect the strength of the acid, which comprises determining the composition of the olefin, determining the water content of the olefin and isoparaffin, sensing the flow rates of the olefin and isoparaffin, the fresh acid and the discharge acid, and controlling one acid flow rate of the fresh acid and the discharge acid flow rates relative to the other acid flow rate of the fresh acid and discharge acid flow rates in accordance with the composition of the olefin, the water content of olefin and isoparaffin and the sensed flow rates so as to control the strength of the acid.
Claim 5
Independent Claim
267 words
A METHOD FOR CONTROLLING THE STRENGTH OF AN ACID IN AN ALKYLATION PROCESSING UNIT WHEREIN AN ISOPARAFFIN IS REACTED WITH OLEFIN IN THE PRESENCE OF THE ACID TO PROVIDE AN ACIDHYDROCARBON MIXTURE TO A SETTLER WHERE THE HYDROCARBON IS SEPARATED FROM THE ACID TO PROVIDE A HYDROCARBON PRODUCT AND A PORTION OF THE ACID IS RECYCLED WHILETHE REMAINING ACID IS DISCHARGED FROM THE ALKYLATION UNIT AND WHEREIN FRESH ACID IS ADDED TO THE RECYCLE ACID TO AFFECT THE STRENGTH OF THE ACID, WHICH COMPRISES DETERMINING THE COMPOSTION OF THE OLEFIN, DETERMINING THE WATER CONTENT OF THE OLEFIN AND ISOPARAFFIN, SENSING THE FLOW RATED OF THE OLEFIN AND ISOPARAFFIN, THE FRESH ACID AND THE DISCHARGE ACID, DETERMINING THE QUANTITY OF AN ALKYLATE COMPOUND BEING FORED FROM THE OLEFIN AND ISOPARAFFIN IN THE ACID AND IMMEDIATELY LEAVING THE ACID PHASE AFTER FORMATION, DETERMINING THE QUANTITY OF AN ACID PHASE AFTER COMPOUND BEING FORMED IN THE ACID PHASE FROM THE ALKYLATE COMPOUND AND WHICH CAN RETURN TO THE ALKYLATE COMPOUND, DETERMINING THE QUANTITY OF ANOTHER ACID CONTAMINATE COMPOUND BEING FORMED FROM THE ALKYLATE COMPOUND AND WHICH CANNOT RETURN TO THE ALKYLATE COMPOUND, AND CONTROLLING THE FLOW RATE OF ONE OF THE ACIDS OF THE FRESH ACID AND DISCHARGE ACID RELATIVE TO THE FLOW RTE OF THE OTHER ACID SO AS TO CONTROL THE ACID STRENGTH IN ACCORDANCE WITH THE DETERMINATION OF THE WATER CONTENT OF THE OLEFIN AND ISOPARAFFIN, WITH THE DETERMINATION OF THE FLOW RATES OF THE ISOPARAFFIN, THE FRESH ACID AND THE DISCHARGE ACID, AND WITH THE DETERMINATION OF THE QUANTITIES OF THE ALKYLATE AND ACID CONTAMINATE COMPOUNDS.
Claim 6
Independent Claim
267 words
A METHOD FOR CONTROLLING THE STRENGTH OF AN ACID IN AN ALKYLATION PROCESSING UNIT WHEREIN AN ISOPARAFFIN IS REACTED WITH OLEFIN IN THE PRESENCE OF THE ACID TO PROVIDE AN ACIDHYDROCARBON MIXTURE TO A SETTLER WHERE THE HYDROCARBON IS SEPARATED FROM THE ACID TO PROVIDE A HYDROCARBON PRODUCT AND A PORTION OF THE ACID IS RECYCLED WHILETHE REMAINING ACID IS DISCHARGED FROM THE ALKYLATION UNIT AND WHEREIN FRESH ACID IS ADDED TO THE RECYCLE ACID TO AFFECT THE STRENGTH OF THE ACID, WHICH COMPRISES DETERMINING THE COMPOSTION OF THE OLEFIN, DETERMINING THE WATER CONTENT OF THE OLEFIN AND ISOPARAFFIN, SENSING THE FLOW RATED OF THE OLEFIN AND ISOPARAFFIN, THE FRESH ACID AND THE DISCHARGE ACID, DETERMINING THE QUANTITY OF AN ALKYLATE COMPOUND BEING FORED FROM THE OLEFIN AND ISOPARAFFIN IN THE ACID AND IMMEDIATELY LEAVING THE ACID PHASE AFTER FORMATION, DETERMINING THE QUANTITY OF AN ACID PHASE AFTER COMPOUND BEING FORMED IN THE ACID PHASE FROM THE ALKYLATE COMPOUND AND WHICH CAN RETURN TO THE ALKYLATE COMPOUND, DETERMINING THE QUANTITY OF ANOTHER ACID CONTAMINATE COMPOUND BEING FORMED FROM THE ALKYLATE COMPOUND AND WHICH CANNOT RETURN TO THE ALKYLATE COMPOUND, AND CONTROLLING THE FLOW RATE OF ONE OF THE ACIDS OF THE FRESH ACID AND DISCHARGE ACID RELATIVE TO THE FLOW RTE OF THE OTHER ACID SO AS TO CONTROL THE ACID STRENGTH IN ACCORDANCE WITH THE DETERMINATION OF THE WATER CONTENT OF THE OLEFIN AND ISOPARAFFIN, WITH THE DETERMINATION OF THE FLOW RATES OF THE ISOPARAFFIN, THE FRESH ACID AND THE DISCHARGE ACID, AND WITH THE DETERMINATION OF THE QUANTITIES OF THE ALKYLATE AND ACID CONTAMINATE COMPOUNDS.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |