| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6bfdf49224a405be1f7b653c56ebad94
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8fdf4bd252086a802c43c7d912459596 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D207-267
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07B63-04 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D207-26 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D207-267 |
| filingDate |
1989-06-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1995-01-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_99e749c9c7e88a2fef8adb29f0ba7ddf
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ea1ad1510e7c5691b4897e57feda5ac
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_afb2a86fbcac515141d026a2789caff3 |
| publicationDate |
1995-01-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-1333806-C |
| titleOfInvention |
Purification of n-methyl-2-pyrrolidone |
| abstract |
A method for purifying N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide is disclosed, comprising adding a polyhalogenated aromatic compound and an alkali metal hydroxide and/or an alkali metal carbonate to the N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide, heat treating the mixture, and subjecting the mixture to separation by distillation. The thiophenol and/or diphenyl disulfide can be removed with ease and at low cost. |
| priorityDate |
1988-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |