| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C65-11
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C62-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-43 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C65-11
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-43
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 |
| filingDate |
1989-01-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1990-04-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f93e89ef046dffe272c6641f069efbc8
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_412a90f936b02185169efad7b82c6fbd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6b3f3b7899981771fbdea80caf996361
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7f250694616c193196c996e2611b9797
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0e8ac90f5208f75b04ab30c1ff25a1e4 |
| publicationDate |
1990-04-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4916257-A |
| titleOfInvention |
Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid |
| abstract |
The invention relates to a process for purification of 2-hydroxynaphthalene-6-carboxylic acid by recrystallization. In this process, the crude acid is recrystallized from water-miscible linear or cyclic aliphatic ethers, aliphatic polyethers or aliphatic hydroxy ethers or from at least 10% strength by weight aqueous solutions of these ethers. Recrystallization from a 35-90% strength by weight aqueous solutions of 1,4-dioxane is particularly preferred. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0803492-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6451109-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6194608-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102659576-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0803492-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102173988-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102173988-B |
| priorityDate |
1988-01-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |