US4467119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic antioxidant
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1983-05-04
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Granted: 1984-08-21
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Expires: 2003-05-04
Abstract
Abstract A process of purifying tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane comprises crystallizing it from an aromatic hydrocarbon having 6 to 9 carbon atoms to produce a product containing said hydrocarbon and removing at least part of the hydrocarbon from the product by washing it with a liquid consisting essentially of at least one water miscible alcohol and water.
Inventors
- 👤 Royston Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:51
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/84; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A process for purifying tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane which comprises: (a) adding an aromatic hydrocarbon having from 6 to 9 carbon atoms to impure product tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane and recrystallizing said product from said aromatic hydrocarbon, thereby producing a recrystallized product containing said hydrocarbon; (b) washing said recrystallized product with a liquid consisting essentially of at least one water-miscible C 1 to C 6 straight or branched chain or cycloaliphatic monohydric alcohol and water, thereby removing at least part of said hydrocarbon; and (c) recovering purified product tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane.
Claim 2
Dependent Claim
92 words
A process for purifying tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane which comprises: (a) adding an aromatic hydrocarbon having from 6 to 9 carbon atoms to impure product tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane and recrystallizing said product from said aromatic hydrocarbon, thereby producing a recrystallized product containing said hydrocarbon; (b) washing said recrystallized product with a liquid consisting essentially of at least one water-miscible C 1 to C 6 straight or branched chain or cycloaliphatic monohydric alcohol and water, thereby removing at least part of said hydrocarbon; and (c) recovering purified product tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane.
Claim 3
Dependent Claim
27 words
A process according to claim 1 in which the tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane is produced by condensing 3 molecules of 3-methyl-6-tert. butyl phenol with crotonaldehyde or aldol.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1 in which the alcohol is a C 1 to C 6 straight or branched chain or cycloaliphatic monohydric alcohol.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 3 in which the alcohol is methanol, ethanol, isopropanol or tertiary butanol.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 1 in which the water content of the wash liquid is in the range 10% to 90% by weight.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1 in which the tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane is prepared by condensing crotonaldehyde with 3-methyl-6-tert. butyl phenol in a 1:3 molar ratio.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 1 including the further step of drying the washed product of step (b) at a temperature of 60° C. to 80° C. to remove residual wash liquid.
References Cited (Backward Citations)
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NL293612A
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US3239484A
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Cited
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US4319051A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |