GB706107A - Improvements in or relating to the separation of dimethylphenols - Google Patents
Improvements in or relating to the separation of dimethylphenolsInfo
- Publication number
- GB706107A GB706107A GB241051A GB241051A GB706107A GB 706107 A GB706107 A GB 706107A GB 241051 A GB241051 A GB 241051A GB 241051 A GB241051 A GB 241051A GB 706107 A GB706107 A GB 706107A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dimethyl
- dimethylphenol
- phenol
- mixture
- sulphuric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
- C07C37/68—Purification; separation; Use of additives, e.g. for stabilisation
- C07C37/86—Purification; separation; Use of additives, e.g. for stabilisation by treatment giving rise to a chemical modification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for the separation of 2 : 4- and 2 : 5-dimethyl-phenols by alkylating a mixture of them with di-isobutylene and separating the 2 : 4-dimethyl-6-ter-octyl-phenol thereby formed from the unchanged 2 : 5-dimethylphenol is characterized in that the 2 : 5-dimethylphenol is separated from the 2 : 4-dimethyl-6-tertiary-octylphenol by dissolution in aqueous caustic alkali solution. A 5 to 10 per cent. aqueous caustic soda solution is suitable. The 2 : 5-dimethyl-phenol may be recovered from the alkali solution by acidification. The 2 : 4-dimethylphenol may be recovered from the alkali-insoluble 2 : 4-dimethyl-6-ter-octylphenol by treatment thereof with an acid catalyst, e.g. sulphuric acid, above 100 DEG C. followed by fractional distillation of the resulting mixture of 2 : 4-dimethyl-phenol and di-isobutylene. In an example a tar acid fraction b. pt. 210 DEG C. to 212 DEG C. (essentially a mixture of 2 : 4- and 2 : 5-dimethyl phenols and sulphuric acid (catalyst) ) is heated to convert the sulphuric acid to xylene sulphonic acids and the product then reacted at 20 DEG C. with diisobutylene (a mixture of 2 : 4 : 4-trimethyl-pentenenes-1 and -2). The reaction mixture is stirred with 10 per cent. aqueous caustic soda solution and forms two phases. 2 : 5-Dimethylphenol is recovered from the alkaline aqueous phase by acidification. The oil phase with the addition of sulphuric acid is distilled at 140 DEG C. to 220 DEG C., and the distillate fractionated to give diisobutylene and 2 : 4-dimethyl-phenol. Specification 645,446 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB241051A GB706107A (en) | 1951-01-31 | 1951-01-31 | Improvements in or relating to the separation of dimethylphenols |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB241051A GB706107A (en) | 1951-01-31 | 1951-01-31 | Improvements in or relating to the separation of dimethylphenols |
Publications (1)
Publication Number | Publication Date |
---|---|
GB706107A true GB706107A (en) | 1954-03-24 |
Family
ID=9739062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB241051A Expired GB706107A (en) | 1951-01-31 | 1951-01-31 | Improvements in or relating to the separation of dimethylphenols |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB706107A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4247719A (en) * | 1979-07-05 | 1981-01-27 | Conoco, Inc. | Process for obtaining 2,5-xylenol from a 2,4-/2,5-xylenol mixture |
US4292450A (en) * | 1979-11-26 | 1981-09-29 | Conoco, Inc. | Selective alkylation of 2,5-xylenol in the presence of 2,4-xylenol |
-
1951
- 1951-01-31 GB GB241051A patent/GB706107A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4247719A (en) * | 1979-07-05 | 1981-01-27 | Conoco, Inc. | Process for obtaining 2,5-xylenol from a 2,4-/2,5-xylenol mixture |
US4292450A (en) * | 1979-11-26 | 1981-09-29 | Conoco, Inc. | Selective alkylation of 2,5-xylenol in the presence of 2,4-xylenol |
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