GB763954A - Improvements relating to the purification of lactams - Google Patents
Improvements relating to the purification of lactamsInfo
- Publication number
- GB763954A GB763954A GB7521/54A GB752154A GB763954A GB 763954 A GB763954 A GB 763954A GB 7521/54 A GB7521/54 A GB 7521/54A GB 752154 A GB752154 A GB 752154A GB 763954 A GB763954 A GB 763954A
- Authority
- GB
- United Kingdom
- Prior art keywords
- treatment
- lactam
- water
- purification
- organic solvent
- 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
- C07D201/16—Separation or purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyrrole Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for purifying lactams comprises extracting the lactam with water from a solution of the crude lactam in an organic solvent not or only slightly miscible with water, and subjecting the resulting aqueous extract to an after-treatment with an organic solvent which is not appreciably miscible with water, in a quantity sufficiently small to ensure that substantially no lactam is removed. The aqueous extraction and the after-treatment of the aqueous extract with an organic solvent are preferably carried out in a number of stages and in counter-current. The solvent used for the after-treatment of the aqueous extract is preferably the same as that used for dissolving the crude lactam, e.g. benzene, toluene. The process may be combined with other methods of purification, e.g. after - treatment with ion exchangers and surface-active adsorbents or preparation of the starting solution by extraction of a solution of more than 80 per cent of crude lactam in water. The examples describe the purification of caprolactam. Specifications 736,196, 757,406 and 762,879 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL763954X | 1953-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB763954A true GB763954A (en) | 1956-12-19 |
Family
ID=19827556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7521/54A Expired GB763954A (en) | 1953-03-19 | 1954-03-15 | Improvements relating to the purification of lactams |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB763954A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2960499A (en) * | 1957-10-26 | 1960-11-15 | Stamicarbon | Preparing a lactam containing lactam oligomers |
| US5362870A (en) * | 1992-04-17 | 1994-11-08 | Sumitomo Chemical Company, Ltd. | Process for producing a high purity caprolactam |
-
1954
- 1954-03-15 GB GB7521/54A patent/GB763954A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2960499A (en) * | 1957-10-26 | 1960-11-15 | Stamicarbon | Preparing a lactam containing lactam oligomers |
| US5362870A (en) * | 1992-04-17 | 1994-11-08 | Sumitomo Chemical Company, Ltd. | Process for producing a high purity caprolactam |
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