US2846489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of friedel-crafts alkylation catalyst by measurement of electro conductivity
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-12-16
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Granted: 1958-08-05
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Expires: 1974-12-16
Abstract
No abstract record available.
Inventors
- 👤 David W Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/70; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/10; C07C2527/11; C07C2527/125; C07C2527/126; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A PROCESS FOR THE PREPARATION OF MONOALKYLATED AROMATIC COMPOUNDS WHEREIN AN OLEFIN IS REACTED WITH AN AROMATIC COMPOUND IN THE PRESENCE OF A FRIEDEL-CRAFTS ORGANO-METAL HALIDE CATALYST COMPLEX AND A PROMOTER TO PRODUCE BOTH MONO- AND POLYALKYLATED AROMATIC COMPOUNDS AND WHEREIN SAID POLYALKYLATED AROMATIC COMPOUNDS ARE DEALKYLATED IN THE PRESENCE OF SAID CATALYST COMPLEX, SAID CATALYST COMPLEX BEING FORTIFIED AT INTERVALS BY THE ADDITION OF FRESH METAL HALIDE, THE STEPS WHICH COMPRISE PASSING A PORTION OF SAID CATALYST COMPLEX THROUGH AN ELECTROCONDUCTIVITY MEASURING DEVICE, MEASURING THE ELECTROCONDUCTIVITY OF THE CATALYST COMPLEX, AND REGULATING THE ADDITION OF THE METAL HALIDE TO SAID CATALYST COMPLEX WITH RESPECT TO A PREDETERMINED ELECTROCONDUCTIVITY SETTING BY SUPPLYING A SUFFICIENT AMOUNT OF METAL
Claim 2
Dependent Claim
118 words
IN A PROCESS FOR THE PREPARATION OF MONOALKYLATED AROMATIC COMPOUNDS WHEREIN AN OLEFIN IS REACTED WITH AN AROMATIC COMPOUND IN THE PRESENCE OF A FRIEDEL-CRAFTS ORGANO-METAL HALIDE CATALYST COMPLEX AND A PROMOTER TO PRODUCE BOTH MONO- AND POLYALKYLATED AROMATIC COMPOUNDS AND WHEREIN SAID POLYALKYLATED AROMATIC COMPOUNDS ARE DEALKYLATED IN THE PRESENCE OF SAID CATALYST COMPLEX, SAID CATALYST COMPLEX BEING FORTIFIED AT INTERVALS BY THE ADDITION OF FRESH METAL HALIDE, THE STEPS WHICH COMPRISE PASSING A PORTION OF SAID CATALYST COMPLEX THROUGH AN ELECTROCONDUCTIVITY MEASURING DEVICE, MEASURING THE ELECTROCONDUCTIVITY OF THE CATALYST COMPLEX, AND REGULATING THE ADDITION OF THE METAL HALIDE TO SAID CATALYST COMPLEX WITH RESPECT TO A PREDETERMINED ELECTROCONDUCTIVITY SETTING BY SUPPLYING A SUFFICIENT AMOUNT OF METAL
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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |