ES470183A1 - Method of purifying caprolactum - Google Patents
Method of purifying caprolactumInfo
- Publication number
- ES470183A1 ES470183A1 ES470183A ES470183A ES470183A1 ES 470183 A1 ES470183 A1 ES 470183A1 ES 470183 A ES470183 A ES 470183A ES 470183 A ES470183 A ES 470183A ES 470183 A1 ES470183 A1 ES 470183A1
- Authority
- ES
- Spain
- Prior art keywords
- phase
- caprolactam
- aqs
- rearrangement
- 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)
- Other In-Based Heterocyclic Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Crude caprolactam contg. acid, obtd. in the rearrangement of cyclohexanone oxime, is mixed with: (i) 0.8-2 equivs. of a base, the pH being adjusted to 4-11 (ii) 3-6 pts. wt. toluene, w.r.t. the caprolactam and (iii) 2-10 pts. wt. water w.r.t. the organic cpds. This forms a toluene phase and a water phase, the latter consisting of two layers. Substantially all the organic impurities are in the upper aq. layer, which is sepd. The crude caprolactam pref. contains 1-2 moles H2SO4 or 0.05-5 moles boric acid, depending on whether the cyclohexanone oxime rearrangement has been performed in the liq. phase with oleum as catalyst or the vapour phase with boric acid as catalyst. Purificn. of caprolactam, derived from rearrangement in oleum, by extraction with benzene is known, but there is a problem of supplementary treatment of the aqs. phase contg. all the impurities. The division of the aqs. phase into two in the present process solves this problem, the upper aqs. layer being easily sepd., e.g. by a siphon.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772724361 DE2724361A1 (en) | 1977-05-28 | 1977-05-28 | CLEANING CAPROLACTAM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES470183A1 true ES470183A1 (en) | 1979-01-01 |
Family
ID=6010216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES470183A Expired ES470183A1 (en) | 1977-05-28 | 1978-05-24 | Method of purifying caprolactum |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS53147085A (en) |
| BE (1) | BE867528A (en) |
| DE (1) | DE2724361A1 (en) |
| ES (1) | ES470183A1 (en) |
| FR (1) | FR2392010A1 (en) |
| IT (1) | IT7849565A0 (en) |
| NL (1) | NL7805812A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3026538A1 (en) * | 1980-07-12 | 1982-02-11 | Basf Ag, 6700 Ludwigshafen | METHOD FOR CONTINUOUS EXTRACTION OF CAPROLACTAM AS SUCH AND AQUEOUS SOLUTIONS CONTAINING THE SAME OF THE OLIGOMER |
| IT1173261B (en) * | 1984-02-08 | 1987-06-18 | Snia Bpd Spa | CAPROLATTAME PURIFICATION PROCESS |
| JP2601946B2 (en) * | 1990-11-21 | 1997-04-23 | 宇部興産株式会社 | Method for purifying lactam-containing solution |
| JP2601945B2 (en) * | 1990-11-21 | 1997-04-23 | 宇部興産株式会社 | Lactam oil refining method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2550934C3 (en) * | 1975-11-13 | 1980-06-12 | Bayer Ag, 5090 Leverkusen | Purification of caprolactam |
-
1977
- 1977-05-28 DE DE19772724361 patent/DE2724361A1/en not_active Withdrawn
-
1978
- 1978-05-24 ES ES470183A patent/ES470183A1/en not_active Expired
- 1978-05-26 BE BE188073A patent/BE867528A/en not_active IP Right Cessation
- 1978-05-26 JP JP6240978A patent/JPS53147085A/en active Pending
- 1978-05-26 FR FR7815780A patent/FR2392010A1/en not_active Withdrawn
- 1978-05-26 IT IT7849565A patent/IT7849565A0/en unknown
- 1978-05-29 NL NL7805812A patent/NL7805812A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2392010A1 (en) | 1978-12-22 |
| DE2724361A1 (en) | 1978-11-30 |
| NL7805812A (en) | 1978-11-30 |
| IT7849565A0 (en) | 1978-05-26 |
| JPS53147085A (en) | 1978-12-21 |
| BE867528A (en) | 1978-11-27 |
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