Patent US3862248A successfully refreshed from Google Patents.
US3862248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pure 2,3,6-trimethylphenol
Assignee: ConocoPhillips Co
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Filing: 1968-10-02
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Granted: 1975-01-21
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Expires: 1988-10-02
Abstract
Abstract 2,3,6-Trimethylphenol is recovered in high yield and high purity from its admixture with di- and tri-methyl-substituted phenols by subjecting the admixture to the sequential steps of butylation, fractional distillation, debutylation, and finally, fractional distillation.
Inventors
- 👤 Donald C Jones
- 👤 Martin B Neuworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:10
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C37/11; C07C37/14; C07C37/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
PROCESS FOR SEPARATING 2,3,6-TRIMETHYLPHENOL FROM A MIXTURE OF EXYLEMOLS AND TRIMETHYLPHENOLS CONTAINING 2,3 XYLENOL AND AT LEAST 40 PERCENT BY WEIGHT OF 2,3,6TRIMETHYLPHENOL WHICH COMPRISES PASSING ISOBUTYLENE INTO SAID MIXTURE AT A TEMPERATURE BELOW 60*C. UNDER BUTYLATING-CONDITIONS TO THEREBY PRODUCE A BUTYLATION PRODUCT CONTAINING 4T-BUTYL-2,3,6-TRIMETHYLPHENOL AND 4,6-DI-T-BUTYL-2,3-EXYLENOL, FRACTIONALLY DISTILLING SAID BUTYLATION PRODUCT TO RECOVER A FRACTION CONTAINING PRINCIPALLY SAID 4-TBUTYL-2,3,6TRIMETHYLPHENOL AND SAID 4,6-DI-T-BUTYL-2,3-EXYLENOL, HEATING SAID FRACTION TO A TEMPERATURE BETWEEN 60* AND 125*C. UNDER DEBUTYLATING CONDITIONS TO EFFECT SELECTIVE DEBUTYLATION OF SAID 4-T-BUTYL-2,3,6-TRIMETHYLPHENOL TO 2,3,6-TRIMETHYLPHENOL AND OF SAID 4,6-DI-BUTYL-2,3-EXYLENOL TO 6-T-BUTYL-2,3-EXYLENOL, AND FRACTIONALLY DISTILLING SAID DEBUTYLATION PRODUCT TO RECOVER 2,3,6-TRIMETHYLPHENOL.
Claim 2
Dependent Claim
100 words
PROCESS FOR SEPARATING 2,3,6-TRIMETHYLPHENOL FROM A MIXTURE OF EXYLEMOLS AND TRIMETHYLPHENOLS CONTAINING 2,3 XYLENOL AND AT LEAST 40 PERCENT BY WEIGHT OF 2,3,6TRIMETHYLPHENOL WHICH COMPRISES PASSING ISOBUTYLENE INTO SAID MIXTURE AT A TEMPERATURE BELOW 60*C. UNDER BUTYLATING-CONDITIONS TO THEREBY PRODUCE A BUTYLATION PRODUCT CONTAINING 4T-BUTYL-2,3,6-TRIMETHYLPHENOL AND 4,6-DI-T-BUTYL-2,3-EXYLENOL, FRACTIONALLY DISTILLING SAID BUTYLATION PRODUCT TO RECOVER A FRACTION CONTAINING PRINCIPALLY SAID 4-TBUTYL-2,3,6TRIMETHYLPHENOL AND SAID 4,6-DI-T-BUTYL-2,3-EXYLENOL, HEATING SAID FRACTION TO A TEMPERATURE BETWEEN 60* AND 125*C. UNDER DEBUTYLATING CONDITIONS TO EFFECT SELECTIVE DEBUTYLATION OF SAID 4-T-BUTYL-2,3,6-TRIMETHYLPHENOL TO 2,3,6-TRIMETHYLPHENOL AND OF SAID 4,6-DI-BUTYL-2,3-EXYLENOL TO 6-T-BUTYL-2,3-EXYLENOL, AND FRACTIONALLY DISTILLING SAID DEBUTYLATION PRODUCT TO RECOVER 2,3,6-TRIMETHYLPHENOL.
Claim 3
Dependent Claim
52 words
The process according to the process of claim 1 in which the butylation is conducted at a temperature between 30* and 50* C. and in the presence of concentrated sulfuric acid; and the debutylation is conducted at a temperature between 80* and 110* C. and in the presence of concentrated sulfuric acid.
Claim 4
Dependent Claim
30 words
The process according to the process of claim 2 in which said mixture of xylenols and trimethylphenols contains 2,4,6-trimethylphenol, 3,4-xylenol and 3,5-xylenol in addition to said 2,3,6-trimethylphenol and said 2,3-xylenol.
References Cited (Backward Citations)
US2435087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |