US2818458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of reboiler fouling in sulfuric acid process for alkylating isobutane with olefins
Assignee: Standard Oil Co
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Filing: 1956-01-13
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Granted: 1957-12-31
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Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Harclerode
- 👤 Edward B Eriksen
- 👤 Oral A Kozeny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:34
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A CASCADE SULFURIC ACID SYSTEM FOR ALKYLATING ISOBUTANE WITH A C3 TO C5 OLEFIN WHEREIN THE FORMATION OF HEAVY ALKYLATE REQUIRES FRACTIONATION OF THE ALKYLATE PRODUCT AND DEPOSITS TEND TO BE FORMED ON THE HEATING SURFACES EMPLOYED FOR SUPPLYING HEAT AT THE BASE OF THE FRACTIONATION ZONE, THE METHOD OF IHIBITING SAID DEPOSIT FORMATION WHICH COMPRISES PERCOLATING SAID ALKYLATE PRODUCT THROUGH A MASS OF SOLID ADSORBENT MATERIAL BEFORE THE TEMPERATURE OF SAID ALKYLATE EXCEEDS 300*F. AND PRIOR TO ITS CONTACT WITH SAID HEATING SURFACES.
Claim 2
Dependent Claim
85 words
IN A CASCADE SULFURIC ACID SYSTEM FOR ALKYLATING ISOBUTANE WITH A C3 TO C5 OLEFIN WHEREIN THE FORMATION OF HEAVY ALKYLATE REQUIRES FRACTIONATION OF THE ALKYLATE PRODUCT AND DEPOSITS TEND TO BE FORMED ON THE HEATING SURFACES EMPLOYED FOR SUPPLYING HEAT AT THE BASE OF THE FRACTIONATION ZONE, THE METHOD OF IHIBITING SAID DEPOSIT FORMATION WHICH COMPRISES PERCOLATING SAID ALKYLATE PRODUCT THROUGH A MASS OF SOLID ADSORBENT MATERIAL BEFORE THE TEMPERATURE OF SAID ALKYLATE EXCEEDS 300*F. AND PRIOR TO ITS CONTACT WITH SAID HEATING SURFACES.
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) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |