GB757406A - Process for purifying lactams - Google Patents
Process for purifying lactamsInfo
- Publication number
- GB757406A GB757406A GB31301/53A GB3130153A GB757406A GB 757406 A GB757406 A GB 757406A GB 31301/53 A GB31301/53 A GB 31301/53A GB 3130153 A GB3130153 A GB 3130153A GB 757406 A GB757406 A GB 757406A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- lactam
- reaction mixture
- liquid phase
- oxidizing agent
- 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
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/02—Preparation of lactams
- C07D201/08—Preparation of lactams from carboxylic acids or derivatives thereof, e.g. hydroxy carboxylic acids, lactones or nitriles
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/16—Separation or purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyrrole Compounds (AREA)
Abstract
A process for purifying lactams comprises heating a solution of contaminated lactam in an inert organic solvent, said solution having a lactam concentration not exceeding 30 per cent by weight, in the presence of an oxidizing agent forming with the said solution an oxidation reaction mixture, the whole of which constitutes a single homogeneous liquid phase, so that the impurities are oxidized, the lactam then being removed, e.g. by distillation or extraction. The oxidation is preferably carried out at the boiling temperature of the reaction mixture and may be preceded or followed by a reduction treatment, e.g. with aluminium amalgam or sodium hydrosulphite. Specified solvents are benzene, decahydronaphthalene, carbon tetrachloride and nitromethane. Specified oxidizing agents are potassium permanganate, potassium bichromate, hydrogen peroxide, ozone and persalts. The oxidizing agent may be employed as an aqueous solution or may be added to a moist lactam solution, a homogeneous liquid phase being maintained by drying out surplus water, e.g. with dehydrating agents such as solid sodium hydroxide or anhydrous sodium sulphate, or by azeotropic distillation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL757406X | 1952-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB757406A true GB757406A (en) | 1956-09-19 |
Family
ID=19825320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31301/53A Expired GB757406A (en) | 1952-11-15 | 1953-11-11 | Process for purifying lactams |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB757406A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459640A (en) * | 1965-04-08 | 1969-08-05 | Teijin Ltd | Process for the purification of lactams |
-
1953
- 1953-11-11 GB GB31301/53A patent/GB757406A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459640A (en) * | 1965-04-08 | 1969-08-05 | Teijin Ltd | Process for the purification of lactams |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB976707A (en) | Improvements in or relating to the desulphurisation of hydrocarbon oils | |
| GB1021587A (en) | Improvements relating to hydrocarbon conversion process and catalysts for use therein | |
| GB949094A (en) | Process for the production of solutions of pure peracetic acid | |
| GB757406A (en) | Process for purifying lactams | |
| ES485723A1 (en) | Wet Oxidation Treatment | |
| GB872355A (en) | Improvements in or relating to the production of a tetrabasic acid and esters thereof | |
| GB838939A (en) | Regeneration of degraded alkyl anthraquinone solutions for the production of hydrogen peroxide | |
| GB1027573A (en) | Unsaturated bicyclic ketones and the preparation thereof | |
| GB870326A (en) | Improvements in or relating to the purification of polymers contaminated by metal compounds | |
| GB786237A (en) | Process for the preparation of hydrogen peroxide | |
| GB723454A (en) | Improvements in or relating to the manufacture of hydroquinone | |
| CH97788A (en) | Process for the production of anthraquinone and its derivatives. | |
| GB1042165A (en) | Process for making mixtures of hydro-peroxides of saturated cyclic terpenes | |
| GB931316A (en) | New anthraquinone derivatives and process for their manufacture | |
| GB1022581A (en) | Purification of lactams | |
| GB1128953A (en) | Process for the production of alkali-metal peroxides | |
| GB1023856A (en) | Method for purifying aqueous solutions of methylbutynol | |
| GB887373A (en) | Process for the manufacture of quinacridones from 6:13-dihydroquinacridones | |
| GB928786A (en) | Stabilized dichloro-difluoro ethyl methyl ether and process | |
| Oku et al. | STUDIES ON THE CHEMICAL MODIFICATION OF SILK (4) ON THE FORMARIZATION OF SILK FIBROIN BY HEXAMETHYLENETETRAMINE | |
| GB958294A (en) | Process for the production of tetrabromophthalic acid anhydride | |
| GB786341A (en) | Manufacture of catechol | |
| GB618994A (en) | Improvements in or relating to the purification of benzene hexachloride | |
| GB754864A (en) | Improvements in and relating to the production of dihydric phenols | |
| GB700864A (en) | Improvements in or relating to the manufacture of hydrogen peroxide |