GB625940A - Improvements in or relating to para-dichlorobenzene - Google Patents
Improvements in or relating to para-dichlorobenzeneInfo
- Publication number
- GB625940A GB625940A GB4358/47A GB435847A GB625940A GB 625940 A GB625940 A GB 625940A GB 4358/47 A GB4358/47 A GB 4358/47A GB 435847 A GB435847 A GB 435847A GB 625940 A GB625940 A GB 625940A
- Authority
- GB
- United Kingdom
- Prior art keywords
- monochlorbenzene
- para
- dichlorbenzene
- benzene
- produced
- 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
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/10—Preparation of halogenated hydrocarbons by replacement by halogens of hydrogen atoms
- C07C17/12—Preparation of halogenated hydrocarbons by replacement by halogens of hydrogen atoms in the ring of aromatic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Para-dichlorbenzene is produced by passing chlorine into a mixture containing 40-50 per cent of benzene and 60-50 per cent of monochlorbenzene, at a temperature between 30-40 DEG C. so that the benzene is converted to monochlorbenzene and the monochlorbenzene to dichlorbenzene. A Friedel Crafts catalyst e.g. ferric chloride is used. The mixture of chlorbenzenes is first neutralized with sodium hydroxide and the monochlorbenzene is then distilled off. The dichlorbenzenes are then fractionated so that the meta and para isomers are distilled leaving the ortho. The para isomer is then crystallized out from the meta by cooling. The hydrochloric acid produced in the original chlorination is reacted with benzene vapour and air in the presence of a catalyst composed of copper and iron chlorides to give monochlorbenzene. The monochlorbenzene so produced together with that obtained from the first distillation is returned to the chlorination step to be converted to dichlorbenzene. The invention is illustrated by means of a diagrammatic flow sheet.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US625940XA | 1946-07-24 | 1946-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB625940A true GB625940A (en) | 1949-07-06 |
Family
ID=22043503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4358/47A Expired GB625940A (en) | 1946-07-24 | 1947-02-14 | Improvements in or relating to para-dichlorobenzene |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB625940A (en) |
-
1947
- 1947-02-14 GB GB4358/47A patent/GB625940A/en not_active Expired
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