GB708034A - Improvements relating to the separation of caprolactam from solution - Google Patents
Improvements relating to the separation of caprolactam from solutionInfo
- Publication number
- GB708034A GB708034A GB958/52A GB95852A GB708034A GB 708034 A GB708034 A GB 708034A GB 958/52 A GB958/52 A GB 958/52A GB 95852 A GB95852 A GB 95852A GB 708034 A GB708034 A GB 708034A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oil
- caprolactam
- solution
- hydroxide
- sodium
- 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
- 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)
- Fats And Perfumes (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Caprolactam is separated from a solution in sulphuric acid or oleum by (a) neutralizing the solution with aqueous ammonia or ammonium salts having an alkaline reaction; (b) separating the caprolactam oil mechanically from the aqueous layer containing dissolved ammonium salts, and (c) mixing the oil with an alkali metal compound or with an alkaline earth metal compound having an alkaline reaction in sufficient quantity to convert the ammonium sulphate dissolved in the oil to an alkali metal or alkaline earth metal salt, separating the solid substances formed and distilling the oil at reduced pressure. Suitable alkali metal or alkaline earth metal compounds are sodium hydroxide, sodium carbonate, sodium borate, barium hydroxide, calcium hydroxide, potassium hydroxide, potassium carbonate, potassium silicate, sodium formate or potassium acetate. In the example a solution of caprolactam in sulphuric acid prepared from cyclohexanonoxime by the Beckmann process is neutralised with aqueous ammonia; the resulting oil is mixed with sodium hydroxide, filtered and distilled under reduced pressure.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL708034X | 1951-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB708034A true GB708034A (en) | 1954-04-28 |
Family
ID=19812121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB958/52A Expired GB708034A (en) | 1951-01-18 | 1952-01-11 | Improvements relating to the separation of caprolactam from solution |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB708034A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2993889A (en) * | 1961-07-25 | Separation of a lactam from an acid | ||
| US3021326A (en) * | 1962-02-13 | snider |
-
1952
- 1952-01-11 GB GB958/52A patent/GB708034A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2993889A (en) * | 1961-07-25 | Separation of a lactam from an acid | ||
| US3021326A (en) * | 1962-02-13 | snider |
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