GB392878A - Process for dehydrating phenols and mixtures containing phenols - Google Patents
Process for dehydrating phenols and mixtures containing phenolsInfo
- Publication number
- GB392878A GB392878A GB5090/33A GB509033A GB392878A GB 392878 A GB392878 A GB 392878A GB 5090/33 A GB5090/33 A GB 5090/33A GB 509033 A GB509033 A GB 509033A GB 392878 A GB392878 A GB 392878A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- water
- entrainer
- cresol
- mixture
- 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
- C07C37/70—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment
- C07C37/74—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment by distillation
- C07C37/78—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment by distillation by azeotropic distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Phenols and mixtures containing them are dehydrated by distilling off the water with the aid of an entrainer which forms with the water a constant boiling point mixture of minimum boiling point. An aqueous cresol containing 96 per cent cresol and 4 per cent water is introduced into the upper third of a continuous distillation column and toluene as entrainer is introduced a few plates higher up the column in such quantity that the boiling point (85 DEG C.) of the azeotropic mixture comprising 12 parts water and 60 parts toluene, is maintained. Anhydrous cresol collects in the still. In the dehydration of an aqueous mixture of phenol and an inorganic solvent, the latter may serve as the entrainer, further quantities being added if required. A mixture produced in the hydrolysis of chlorobenzene by alkalis under pressure comprising 70 parts phenol, 5 parts chlorobenzene, 15 parts diphenyl ether, and 10 parts water, is similarly dehydrated in a column to which additional chlorobenzene is admitted at a higher level.ALSO:Phenols and mixtures containing them are dehydrated by distilling off the water with the aid of an entrainer which forms with the water a constant boiling point mixture of minimum boiling-point. An aqueous cresol containing 96 per cent cresol and 4 per cent water is introduced into the upper third of a continuous distillation column and toluene as entrainer is introduced a few plates higher up the column in such quantity that the boiling-point (85 DEG C.) of the azeotropic mixture, comprising 12 parts water and 60 parts toluene, is maintained. Anhydrous cresol collects in the still. In the dehydration of an aqueous mixture of phenol and an organic solvent, the latter may serve as the entrainer, further quantities being added if required. A mixture produced in the hydrolysis of chlorobenzene by alkalis under pressure comprising 70 parts phenol, 5 parts chlorobenzene, 15 parts diphenyl ether, and 10 parts water is similarly dehydrated in a column to which additional chlorobenzene is admitted at a higher level.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE392878X | 1932-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB392878A true GB392878A (en) | 1933-05-25 |
Family
ID=6388241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5090/33A Expired GB392878A (en) | 1932-02-20 | 1933-02-18 | Process for dehydrating phenols and mixtures containing phenols |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB392878A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325789A (en) * | 1979-02-08 | 1982-04-20 | Bayer Aktiengesellschaft | Process for separating off phenol from a mixture thereof with a cresol |
| EP1932822A1 (en) * | 2005-09-01 | 2008-06-18 | Sumitomo Chemical Company, Limited | Dehydration method |
-
1933
- 1933-02-18 GB GB5090/33A patent/GB392878A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325789A (en) * | 1979-02-08 | 1982-04-20 | Bayer Aktiengesellschaft | Process for separating off phenol from a mixture thereof with a cresol |
| EP1932822A1 (en) * | 2005-09-01 | 2008-06-18 | Sumitomo Chemical Company, Limited | Dehydration method |
| EP1932822A4 (en) * | 2005-09-01 | 2010-07-14 | Sumitomo Chemical Co | Dehydration method |
| CN101253141B (en) * | 2005-09-01 | 2011-10-26 | 住友化学株式会社 | Dehydration method |
| US8257557B2 (en) | 2005-09-01 | 2012-09-04 | Sumitomo Chemical Company, Limited | Dehydration method |
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