| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_74143a02b42b52722da005fb4d927bbc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_dd8b0f61ddfe7343aa0b92fb4cfe7c6c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a6831d6e84b7185f81404d53bc1f8cf5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0868d3238b4e0ddaa76a18aaa641bbc1 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S203-90 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D201-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D201-16 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-16
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D223-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D3-34 |
| filingDate |
2008-05-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2012-07-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_50f1e5c7fd76b4957b3268d615f9c1a8
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_886a51c5c9202d5d9af3ea97d8df1edd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_af93e959dcab5a7051ddc675656160a6 |
| publicationDate |
2012-07-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-8231765-B2 |
| titleOfInvention |
Process for the purification of lactams |
| abstract |
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammonia from the reaction medium of the hydrolysis, then recovering the lactam from the medium in purified form. The recovery is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction having compounds more volatile than the lactam, a fraction having the lactam to be recovered to the degree of desired purity and a distillation tails having the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recover the major part of the caprolactam and recycling the latter in the purification process. |
| priorityDate |
2000-05-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |