GB995723A - Process for the separation of ªÏ-dodecalactam - Google Patents
Process for the separation of ªÏ-dodecalactamInfo
- Publication number
- GB995723A GB995723A GB1820364A GB1820364A GB995723A GB 995723 A GB995723 A GB 995723A GB 1820364 A GB1820364 A GB 1820364A GB 1820364 A GB1820364 A GB 1820364A GB 995723 A GB995723 A GB 995723A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- dodecalactam
- cyclododecacarboxylic
- sulphuric acid
- oleum
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention relates to a method of separating o -dodecalactam from the crude reaction product obtained by treating cyclododecacarboxylic acid with a nitrosylating agent in concentrated sulphuric acid or oleum, decarboxylating the nitrosocarboxylic acid to yield cyclododecanone oxime and subjecting the latter to the Beckmann re-arrangement. According to the invention, the resulting mixture of cyclododecacarboxylic acid, o -dodecalactam and sulphuric acid or oleum is diluted with water to a sulphuric acid content of 65-85% by weight, whereby the cyclododecacarboxylic acid is precipitated and the o -dodecalactam remains in solution. The lactam may then be precipitated by further diluting the solution to a sulphuric acid content of 20-30% by weight. Examples are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH600863A CH421969A (en) | 1963-05-14 | 1963-05-14 | Process for the separation of w-dodecalactam / cyclododecacarboxylic acid mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB995723A true GB995723A (en) | 1965-06-23 |
Family
ID=4302803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1820364A Expired GB995723A (en) | 1963-05-14 | 1964-05-01 | Process for the separation of ªÏ-dodecalactam |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT244322B (en) |
| BE (1) | BE646083A (en) |
| CH (1) | CH421969A (en) |
| DK (1) | DK104236C (en) |
| ES (1) | ES299033A1 (en) |
| FI (1) | FI44234B (en) |
| GB (1) | GB995723A (en) |
| NL (1) | NL6405306A (en) |
-
1963
- 1963-05-14 CH CH600863A patent/CH421969A/en unknown
-
1964
- 1964-03-14 FI FI55464A patent/FI44234B/fi active
- 1964-04-02 DK DK163364A patent/DK104236C/en active
- 1964-04-03 BE BE646083D patent/BE646083A/xx unknown
- 1964-04-07 AT AT299964A patent/AT244322B/en active
- 1964-04-22 ES ES299033A patent/ES299033A1/en not_active Expired
- 1964-05-01 GB GB1820364A patent/GB995723A/en not_active Expired
- 1964-05-13 NL NL6405306A patent/NL6405306A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE646083A (en) | 1964-07-31 |
| AT244322B (en) | 1965-12-27 |
| DK104236C (en) | 1966-04-25 |
| FI44234B (en) | 1971-06-30 |
| ES299033A1 (en) | 1964-06-16 |
| CH421969A (en) | 1966-10-15 |
| NL6405306A (en) | 1964-11-16 |
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