GB924098A - Improvements relating to the recovery of caprolactam and ammonium sulphate - Google Patents
Improvements relating to the recovery of caprolactam and ammonium sulphateInfo
- Publication number
- GB924098A GB924098A GB3843260A GB3843260A GB924098A GB 924098 A GB924098 A GB 924098A GB 3843260 A GB3843260 A GB 3843260A GB 3843260 A GB3843260 A GB 3843260A GB 924098 A GB924098 A GB 924098A
- Authority
- GB
- United Kingdom
- Prior art keywords
- caprolactam
- ammonium sulphate
- recovered
- layers
- reaction mixture
- 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
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Other In-Based Heterocyclic Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Ammonium sulphate is recovered from a reaction mixture obtained by nitrosylating a compound containing a cyclohexyl group with a tertiary carbon atom in the ring, in the presence of sulphuric acid, by neutralizing with ammonia to a pH of 6 to 6,5, allowing the mixture to separate into two layers, separating and, after extracting caprolactam from the denser layer, recovering ammonium sulphate therefrom, e.g. by crystallisation. According to the Provisional Specification, the process is applicable to the mixture obtained by the Beckmann rearrangement process. Specifications 904,302, 904,413 and 912,034 are referred to.ALSO:Caprolactam is recovered from a reaction mixture obtained by nitrosylating a compound containing a cyclohexyl group with a tertiary carbon atom in the ring, in the presence of sulphuric acid, by neutralising with ammonia to a pH of 6 to 6.5, allowing the mixture to separate into two layers, separating, adding ammonia to both fractions to complete the neutralisation, extracting the caprolactam from both layers using a solvent, and ammonium sulphate is recovered from the denser layer. The starting material may be hexahydrobenzoic acid which may be removed from the reaction mixture by cyclohexane. The solvent for caprolactam may be methylene chloride. According to the Provisional Specification, the process may also be applied to the recovery of caprolactam prepared by the p Beckmann rearrangement process. Specifications 904,302, 904,413 and 912,034 are referred to.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3843260A GB924098A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to the recovery of caprolactam and ammonium sulphate |
| ES0271859A ES271859A1 (en) | 1960-11-09 | 1961-11-09 | CAPROLACTAM AND AMMONIUM SULPHATE RECOVERY PROCEDURE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3843260A GB924098A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to the recovery of caprolactam and ammonium sulphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB924098A true GB924098A (en) | 1963-04-24 |
Family
ID=10403390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3843260A Expired GB924098A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to the recovery of caprolactam and ammonium sulphate |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES271859A1 (en) |
| GB (1) | GB924098A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2651195A1 (en) * | 1976-11-10 | 1978-05-18 | Basf Ag | Recovering large crystals of pure ammonium sulphate - from caprolactam synthesis, by neutralising, removing lactam and evapn. |
-
1960
- 1960-11-09 GB GB3843260A patent/GB924098A/en not_active Expired
-
1961
- 1961-11-09 ES ES0271859A patent/ES271859A1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2651195A1 (en) * | 1976-11-10 | 1978-05-18 | Basf Ag | Recovering large crystals of pure ammonium sulphate - from caprolactam synthesis, by neutralising, removing lactam and evapn. |
Also Published As
| Publication number | Publication date |
|---|---|
| ES271859A1 (en) | 1962-03-01 |
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