US4066652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted 8-hydroxyquinolines and process for the preparation thereof
Assignee: Ashland LLC
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Filing: 1973-09-12
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Granted: 1978-01-03
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Expires: 1993-09-12
Abstract
Abstract A class of hydrocarbyl substituted 8-hydroxyquinolines wherein the indicated substituent arises through the indirect alkylation of said quinolinol with a hindered aldehyde. These alkylates are useful metal collectors in hydrometallurgical extraction processes designed for the recovery of metal values from dilute aqueous solutions thereof.
Inventors
- 👤 James A. Hartlage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:29
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/24; C07D215/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A process for preparing a compound of the formula: ##STR4## wherein R and R' represent alkyl groups having a sum total of 6-18 carbon atoms, which comprises the steps of heating at a temperature of about 140°-200° C. substantially equal molar amounts of 8-hydroxyquinoline and a hindered aldehyde of the formula: ##STR5## wherein R and R' have the above-mentioned meanings, to effect the condensation thereof and the concomitant removal of water of dehydration from the condensate and thereupon distilling the reaction product to recover the resultant alkylate.
Claim 2
Dependent Claim
87 words
A process for preparing a compound of the formula: ##STR4## wherein R and R' represent alkyl groups having a sum total of 6-18 carbon atoms, which comprises the steps of heating at a temperature of about 140°-200° C. substantially equal molar amounts of 8-hydroxyquinoline and a hindered aldehyde of the formula: ##STR5## wherein R and R' have the above-mentioned meanings, to effect the condensation thereof and the concomitant removal of water of dehydration from the condensate and thereupon distilling the reaction product to recover the resultant alkylate.
Claim 3
Dependent Claim
20 words
A process in accordance with claim 1 wherein the removal of the water of dehydration is effected by azeotropic distillation.
Claim 4
Dependent Claim
17 words
A process in accordance with claim 2 wherein the solvent is toluene, xylene or a mixture thereof.
Claim 5
Dependent Claim
41 words
A process in accordance with claim 3 wherein said distillation step is carried out on a reaction product freed of solvent at a pressure not in excess of 5mm Hg at a pot temperature of from about 150° to 350° C.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |