GB757397A - Improvements in or relating to the production of cresols - Google Patents
Improvements in or relating to the production of cresolsInfo
- Publication number
- GB757397A GB757397A GB2285353A GB2285353A GB757397A GB 757397 A GB757397 A GB 757397A GB 2285353 A GB2285353 A GB 2285353A GB 2285353 A GB2285353 A GB 2285353A GB 757397 A GB757397 A GB 757397A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cresol
- zinc
- production
- chromium
- oxides
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/85—Chromium, molybdenum or tungsten
- B01J23/86—Chromium
- B01J23/862—Iron and chromium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The process of the parent Specification for the production of cresol by vapour phase hydrogenation of chlorocresol is carried out in the presence of a chromite catalyst consisting of an oxide of chromium associated with at least one of the following metals or their oxides: zinc, cadmium, iron, cobalt, nickel, manganese, aluminium, barium, calcium, magnesium, copper or silver. A suitable temperature is 250-550 DEG C., preferably 300-400 DEG C., the molar ratio of hydrogen to chloro-cresol being up to 5:1 for a good yield of cresol. The catalyst is preferably jacketed with a heat exchange medium to prevent any local rise in temperature. The process is particularly applicable to the production of o-cresol from 6-chloro-o-cresol, an example of this being given using a zinc-iron-chromium oxide catalyst. The reaction may form part of a cyclic process for the production of 2-methyl-4-chlorophenoxyacetic acid as in the parent Specification.ALSO:Catalysts for the hydrogenation of chloro-cresol to cresol comprise an oxide of chromium in association with at least one of the following metals or their oxides:-zinc, cadmium, iron, cobalt, nickel, manganese, aluminium, barium, calcium, magnesium, copper or silver. They may be made by precipitation of the hydrated oxides from solutions of their salts, followed by drying and calcining, or by the process of Specification 301,806 [Class 1(1)]. In the example a solution of zinc nitrate, ferric nitrate and chromium trioxide is precipitated with ammonia and the hydrated oxides dried, calcined, ground and pelleted, giving a product containing the metals in proportion 4:1:5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2285353A GB757397A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to the production of cresols |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2285353A GB757397A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to the production of cresols |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB757397A true GB757397A (en) | 1956-09-19 |
Family
ID=10186094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2285353A Expired GB757397A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to the production of cresols |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB757397A (en) |
-
1953
- 1953-08-19 GB GB2285353A patent/GB757397A/en not_active Expired
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