GB854538A - Purification of caprolactam - Google Patents
Purification of caprolactamInfo
- Publication number
- GB854538A GB854538A GB26926/59A GB2692659A GB854538A GB 854538 A GB854538 A GB 854538A GB 26926/59 A GB26926/59 A GB 26926/59A GB 2692659 A GB2692659 A GB 2692659A GB 854538 A GB854538 A GB 854538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- caprolactam
- alkali metal
- water
- metal hydroxide
- purified
- 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
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 title abstract 19
- 238000000746 purification Methods 0.000 title 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 5
- 239000000203 mixture Substances 0.000 abstract 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 230000008014 freezing Effects 0.000 abstract 1
- 238000007710 freezing Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000007791 liquid phase Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 abstract 1
- 239000012286 potassium permanganate Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
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
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/02—Preparation of lactams
- C07D201/08—Preparation of lactams from carboxylic acids or derivatives thereof, e.g. hydroxy carboxylic acids, lactones or nitriles
-
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
<FORM:0854538/IV(b)/1> Crude e -caprolactam containing not more than about 10% by weight of impurities oxidizable by potassium permanganate is purified by forming a mixture consisting essentially of caprolactam, water, and NaOH and/or KOH, the weight proportions of the three components lying within the quadrilateral on an equilateral triangular composition bounded by the lines connecting the points at (1% caprolactam, 69% alkali metal hydroxide, 30% water), (1% caprolactam, 19% alkali metal hydroxide, 80% water), (55% caprolactam, 5% alkali metal hydroxide, 40% water), and (93% caprolactam, 5% alkali metal hydroxide, 2% water) (see the Figure); bringing the mixture to 15-75 DEG C. to form two liquid phases, separating the caprolactam phase, and distilling caprolactam. The process may be made continuous, the alkali metal hydroxide solution being re-used. The caprolactam may be purified by freezing out of aqueous solution. In the Figure, the inner quadrilateral represents a preferred range of compositions.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US854538XA | 1958-09-08 | 1958-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB854538A true GB854538A (en) | 1960-11-23 |
Family
ID=22191705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26926/59A Expired GB854538A (en) | 1958-09-08 | 1959-08-06 | Purification of caprolactam |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB854538A (en) |
-
1959
- 1959-08-06 GB GB26926/59A patent/GB854538A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1425532A (en) | Cyclic mercaptals and a process for the manufacture thereof | |
| ES424294A1 (en) | Liquid soap composition | |
| GB854538A (en) | Purification of caprolactam | |
| GB1238351A (en) | ||
| GB1332968A (en) | Recovery of hydrogen fluoride | |
| GB1323478A (en) | Process of preparing polyalkylenglycol dibenzoates | |
| JPS55164679A (en) | Purification of cyclic ether | |
| JPS5748949A (en) | Preparation of ethylenediaminetetraacetic acid alkali metal salt | |
| ES296157A1 (en) | Process for hydrating propylene | |
| GB1313325A (en) | Purification of tetrahydrofuran | |
| ES8102083A1 (en) | Method for the preparation of an alkali metal benzoate together with benzyl alcohol. | |
| GB1311534A (en) | Cleaning agents | |
| JPS52102217A (en) | Purification of glycidyl esters | |
| JPS5236622A (en) | Process for preparation of bromoacetic acid | |
| GB889705A (en) | Improvements in or relating to the preparation of treatment of monomethyl hydrazine | |
| JPS5214739A (en) | Process for recovery of terephthalic acid | |
| GB952286A (en) | Process for the production of zinc | |
| GB899693A (en) | Purification of hexafluoropropylene | |
| GB951663A (en) | Process for the preparation of 6-deoxy-6-demethyl-6-methylene-5-oxytetracycline | |
| JPS5237832A (en) | Preparation of alkali titanate fibers | |
| JPS532437A (en) | Decomposition of m-(2-hydroxy-2-propyl)cumenehydroperoxide | |
| GB1147458A (en) | Purification process | |
| GB585316A (en) | Improvements in or relating to the purification of capryl alcohol | |
| JPS5444655A (en) | Production of 1-chloroanthroquinone-2-carboxylic acid | |
| JPS5315384A (en) | Preparation of methylpiperazinones |