GB841383A - Process for the production of pure ª-caprolactam from beckmann reaction mixture - Google Patents
Process for the production of pure ª-caprolactam from beckmann reaction mixtureInfo
- Publication number
- GB841383A GB841383A GB34216/57A GB3421657A GB841383A GB 841383 A GB841383 A GB 841383A GB 34216/57 A GB34216/57 A GB 34216/57A GB 3421657 A GB3421657 A GB 3421657A GB 841383 A GB841383 A GB 841383A
- Authority
- GB
- United Kingdom
- Prior art keywords
- benzene
- reaction mixture
- lactam
- water
- caprolactam
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/02—Preparation of lactams
- C07D201/04—Preparation of lactams from or via oximes by Beckmann rearrangement
-
- 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
- C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
- C07D223/02—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings
- C07D223/06—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D223/08—Oxygen atoms
- C07D223/10—Oxygen atoms attached in position 2
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Pure e -caprolactam is obtained from the neutralized reaction mixture from the Beckmann rearrangement of cyclohexanone oxime by sulphuric acid, by intimately mixing the two-phase mixture (consisting of an aqueous lower layer containing sulphates and a small quantity of lactam, and an organic layer containing lactam, some water and a small quantity of sulphates) with about 2-10 parts by weight of benzene, calculated on the lactam content of the mixture, separating the upper layer of the resulting two-phase mixture, distilling off benzene from this layer, and finally distilling off lactam. The separated aqueous lower layer may be washed with benzene, which is then used for a further extraction of neutralized reaction mixture. The separated benzene layer may be washed with water or weakly acidified water prior to distillation of the benzene, and the wash water may be added to the reaction mixture of a fresh batch before or during the mixing with benzene. Specifications 594,263 and 703,019 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE841383X | 1956-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB841383A true GB841383A (en) | 1960-07-13 |
Family
ID=6766580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34216/57A Expired GB841383A (en) | 1956-11-10 | 1957-11-01 | Process for the production of pure ª-caprolactam from beckmann reaction mixture |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB841383A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115073343A (en) * | 2022-06-29 | 2022-09-20 | 中国天辰工程有限公司 | Caprolactam synthesis method without by-product ammonium sulfate |
-
1957
- 1957-11-01 GB GB34216/57A patent/GB841383A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115073343A (en) * | 2022-06-29 | 2022-09-20 | 中国天辰工程有限公司 | Caprolactam synthesis method without by-product ammonium sulfate |
| CN115073343B (en) * | 2022-06-29 | 2023-09-29 | 中国天辰工程有限公司 | Caprolactam synthesis method without by-product ammonium sulfate |
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