http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4284797-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_79751aeaa9923745648e5ae7d9c35782 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C201-16 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C205-57 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C201-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C201-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 |
| filingDate | 1979-05-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1981-08-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_699cbcaa50d416fd4a4331e3fdfd52d9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c663e4b27aa50daf503a7332eb48256c |
| publicationDate | 1981-08-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-4284797-A |
| titleOfInvention | Process for separating mixtures of 3- and 4-nitrophthalic acid |
| abstract | A novel improved process for separating mixtures of 3- and 4-nitrophthalic acid is described. The said process comprises treating a mixture of 3- and 4-nitrophthalic acid, which mixture is free from inorganic acid residues, in an aqueous-organic medium containing 1-20 percent by volume of water, at a temperature of between 20 DEG and 100 DEG C., stepwise with a base capable of forming salts of 3- and 4-nitrophthalic acid, which salts are essentially insoluble in the reaction medium, the treatment being carried out by adding base until a pH value of about 2.8 is obtained, separating the precipitating product consisting mainly of a 3-nitrophthalic acid mono-salt, subsequently precipitating, by the addition of further base, a product consisting principally of a 4-nitrophthalic acid salt, and finally converting the resulting nitrophthalic acid salts separately into the corresponding free acids, and optionally purifying these. The 3- and 4-nitrophthalic acid can be obtained by the process according to the invention in a simple manner in an isomer-free form and in good to very good yields. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9642836-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114634417-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1321972-C http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1308677-C http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104974044-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109180493-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101134728-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-100432042-C |
| priorityDate | 1978-06-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 124.