GB819683A - Improvements in and relating to the de-polymerisation of cyclic polymers of -e-caprolactam - Google Patents
Improvements in and relating to the de-polymerisation of cyclic polymers of -e-caprolactamInfo
- Publication number
- GB819683A GB819683A GB520757A GB520757A GB819683A GB 819683 A GB819683 A GB 819683A GB 520757 A GB520757 A GB 520757A GB 520757 A GB520757 A GB 520757A GB 819683 A GB819683 A GB 819683A
- Authority
- GB
- United Kingdom
- Prior art keywords
- monomer
- caprolactam
- polymer
- cyclic polymers
- vapours
- 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
- C07D201/02—Preparation of lactams
- C07D201/12—Preparation of lactams by depolymerising polyamides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Cyclic polymers of e -caprolactam, such as a dimer, are converted into the monomer by contact in the vapour phase with a bed of inert material at elevated temperature (preferably at least 300 DEG C., e.g. 350-450 DEG C.), and the resulting vapours treated to recover the monomer. The preferred pressure is atmospheric. By "inert material" is meant a material which exerts substantially no chemical or catalytic action, its function being believed to be the rapid transfer of heat to the vaporized polymer; suitable inert materials are sand, silica chips, coke and ceramic materials. The vaporized polymer may contain monomer or be in the presence of a carrier gas. The monomer may be separated by condensing the vapours and extracting with a suitable solvent, such as water; unreacted polymer may be re-cycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB520757A GB819683A (en) | 1957-02-15 | 1957-02-15 | Improvements in and relating to the de-polymerisation of cyclic polymers of -e-caprolactam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB520757A GB819683A (en) | 1957-02-15 | 1957-02-15 | Improvements in and relating to the de-polymerisation of cyclic polymers of -e-caprolactam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB819683A true GB819683A (en) | 1959-09-09 |
Family
ID=9791727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB520757A Expired GB819683A (en) | 1957-02-15 | 1957-02-15 | Improvements in and relating to the de-polymerisation of cyclic polymers of -e-caprolactam |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB819683A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0046183A1 (en) * | 1980-08-14 | 1982-02-24 | BASF Aktiengesellschaft | Process for the production of caprolactam by decomposition of caprolactam oligomers |
| EP0570843A2 (en) * | 1992-05-21 | 1993-11-24 | BASF Aktiengesellschaft | Process for the recovery of caprolactame from oligomers and/or polymers of caprolactame |
-
1957
- 1957-02-15 GB GB520757A patent/GB819683A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0046183A1 (en) * | 1980-08-14 | 1982-02-24 | BASF Aktiengesellschaft | Process for the production of caprolactam by decomposition of caprolactam oligomers |
| EP0570843A2 (en) * | 1992-05-21 | 1993-11-24 | BASF Aktiengesellschaft | Process for the recovery of caprolactame from oligomers and/or polymers of caprolactame |
| EP0570843A3 (en) * | 1992-05-21 | 1994-04-27 | Basf Ag | |
| US5360905A (en) * | 1992-05-21 | 1994-11-01 | Basf Aktiengesellschaft | Recovery of caprolactam from oligomers and/or polymers of caprolactam |
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