GB1379283A - Separation of lactam from a medium containing concentrated sulphuric acid or sulphuric acid and sulphur trioxide - Google Patents
Separation of lactam from a medium containing concentrated sulphuric acid or sulphuric acid and sulphur trioxideInfo
- Publication number
- GB1379283A GB1379283A GB2113672A GB2113672A GB1379283A GB 1379283 A GB1379283 A GB 1379283A GB 2113672 A GB2113672 A GB 2113672A GB 2113672 A GB2113672 A GB 2113672A GB 1379283 A GB1379283 A GB 1379283A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lactam
- sulphuric acid
- medium containing
- separation
- resulting solution
- 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
1379283 Separation of lactams STAMICARBON NV 5 May 1972 [7 May 1971] 21136/72 Heading C2C Lactam is separated from a strongly acid medium of sulphuric acid, or such a medium which additionally contains free sulphur trioxide, by partially neutralizing the strongly acid medium containing lactam with a recycled mother liquor containing ammonium sulphate whereby in the resulting solution the molar ratio (NH 4 ) 2 SO 4 /(NH 4 ) 2 SO 4 +H 2 SO 4 is between 0À4 : 1 and 0À6 : 1, extracting the lactam from the said resulting solution, decreasing the acidity of the remaining solution of ammonium sulphate and sulphuric acid with gaseous ammonia, and crystallizing from the resulting solution ammonium sulphate or tri-ammonium hydrogen sulphate and separating the crystals from the solution in an amount corresponding to the amount of sulphuric acid in the initial lactam/ sulphuric acid medium, and recycling the remaining mother liquor to dilute the strongly acid medium containing lactam. The lactam may be extracted, e.g. with chloroform at temperatures of 20-40‹ C. The process is illustrated by a flow diagram, and in examples solutions of caprolactam obtained by the Beckmann rearrangement are treated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7106340A NL7106340A (en) | 1971-05-07 | 1971-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1379283A true GB1379283A (en) | 1975-01-02 |
Family
ID=19813108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2113672A Expired GB1379283A (en) | 1971-05-07 | 1972-05-05 | Separation of lactam from a medium containing concentrated sulphuric acid or sulphuric acid and sulphur trioxide |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE783099A (en) |
| DE (1) | DE2222158A1 (en) |
| GB (1) | GB1379283A (en) |
| NL (1) | NL7106340A (en) |
-
1971
- 1971-05-07 NL NL7106340A patent/NL7106340A/xx unknown
-
1972
- 1972-05-05 BE BE783099A patent/BE783099A/en unknown
- 1972-05-05 DE DE19722222158 patent/DE2222158A1/en active Pending
- 1972-05-05 GB GB2113672A patent/GB1379283A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE783099A (en) | 1972-11-06 |
| NL7106340A (en) | 1972-11-09 |
| DE2222158A1 (en) | 1972-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |