GB1057854A - Lactam recovery process - Google Patents
Lactam recovery processInfo
- Publication number
- GB1057854A GB1057854A GB39616/63A GB3961663A GB1057854A GB 1057854 A GB1057854 A GB 1057854A GB 39616/63 A GB39616/63 A GB 39616/63A GB 3961663 A GB3961663 A GB 3961663A GB 1057854 A GB1057854 A GB 1057854A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lactam
- phase
- ammonium sulphate
- mixture
- weight
- 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
- 150000003951 lactams Chemical class 0.000 title abstract 11
- 238000011084 recovery Methods 0.000 title 1
- 239000000203 mixture Substances 0.000 abstract 7
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 abstract 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 abstract 6
- 239000001166 ammonium sulphate Substances 0.000 abstract 6
- 235000011130 ammonium sulphate Nutrition 0.000 abstract 6
- 239000012071 phase Substances 0.000 abstract 5
- 239000007788 liquid Substances 0.000 abstract 4
- 239000007791 liquid phase Substances 0.000 abstract 4
- 239000007787 solid Substances 0.000 abstract 4
- 238000005406 washing Methods 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 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)
- Removal Of Specific Substances (AREA)
Abstract
A process for recovering a lactam from a mixture thereof with sulphuric acid comprises treating the mixture at a temperature in the range of 20 DEG to 60 DEG C. with ammonia in the presence of concentrated liquid aqueous lactam, the weight of lactam in solution being at least 2 1/3 times the weight of water, separating from the resulting mixture a solid ammonium sulphate phase and a lactam rich liquid phase, washing the solid ammonium sulphate phase with concentrated aqueous ammonium sulphate liquid, mixing the washings with the lactam-rich liquid phase and separating from the resulting mixture a lactam-rich liquid phase, and a concentrated aqueous ammonium sulphate phase, and recycling a part of the last-mentioned lactam-rich liquid phase to the treating step to provide the desired concentration. The ammonium sulphate phase may be recycled to the washing step. The concentrations in the treatment stage are preferably regulated to give a solid ammonium sulphate phase which is 20 to 35% of the weight of the total mixture. The lactam may be caprolactam and water may be added in the treatment step to give a mixture containing as liquids about 68% by weight of lactam, 28% of water and 4% solutes, the solids being 43 parts by weight per 133 parts of liquid mixture. C4- 11 lactams are preferred.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22953862A | 1962-10-10 | 1962-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1057854A true GB1057854A (en) | 1967-02-08 |
Family
ID=22861664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39616/63A Expired GB1057854A (en) | 1962-10-10 | 1963-10-08 | Lactam recovery process |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE638048A (en) |
| GB (1) | GB1057854A (en) |
-
1963
- 1963-10-01 BE BE638048A patent/BE638048A/en unknown
- 1963-10-08 GB GB39616/63A patent/GB1057854A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE638048A (en) | 1964-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES431120A1 (en) | Cyclic process for re-use of waste water generated during the production of UO{HD 2 | |
| DE3264299D1 (en) | Process and apparatus to regulate the nh3 content of the wash liquor whilst washing gases | |
| GB996322A (en) | Simultaneous recovery of pure ammonium sulphate and pure lactams from rearrangement mixtures of alicyclic ketoximes | |
| GB1462117A (en) | Partial or complete separation of gas mixtures containing ammonia 'nd carbon dioxide | |
| GB1057854A (en) | Lactam recovery process | |
| GB956650A (en) | Improvements in or relating to the production of ammonium hydrogen fluoride | |
| DE60222292T2 (en) | CHEMICAL AND THERMAL DECOMPOSITION OF AMMONIUM SULFATE TO AMMONIA AND SULFURIC ACID | |
| IE35308L (en) | Urea production | |
| GB820437A (en) | Recovery of ammonia and hydrogen cyanide | |
| GB1508942A (en) | Process for producing lactams | |
| GB1135063A (en) | Process for the purification of malic acid | |
| GB1399000A (en) | Process for the recovery of pure epsilon-caprolactam | |
| JPS5522330A (en) | Caprolactam byproduct ammonium sulfate waste liquid treatment | |
| GB1083085A (en) | Process for the recovery of free sulfuric acid from ammonium bisulfate | |
| ATE24717T1 (en) | PROCESS FOR PRODUCTION OF 3-PICOLINE. | |
| ES388664A1 (en) | Process for the recovery of ammonium sulphate from it aqueous solutions contaminated by organic substances | |
| GB1103351A (en) | Method of preparing urea | |
| SU133466A1 (en) | Selection method of selenium from nitrous sulfuric acid | |
| GB1397289A (en) | Process for the recovery of lactam | |
| GB1001547A (en) | Process for the separation of ªÏ-dodecalactam | |
| GB911614A (en) | Improved process for salt purification | |
| GB1020088A (en) | Improvements in or relating to the recovery and purification of acrylonitrile | |
| GB1021197A (en) | Process for the manufacture of lactams | |
| SU919993A1 (en) | Method of extraction purification of ammonium sulphate from colored organic impurities | |
| SU479755A1 (en) | Adipic acid release process from caprolactam production waste |