http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398724-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_14effe3850d2129f863b969dac4f1db8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C309-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C303-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C303-44 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C301-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-47 |
| filingDate | 1978-07-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1979-02-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | FR-2398724-A1 |
| titleOfInvention | IMPROVEMENTS IN THE PREPARATION OF 2-AMINO-1-NAPHTALENESULPHONIC ACID OR TOBIAS ACID |
| abstract | For this preparation, a solution of 2-hydroxynaphthalene BN is reacted in I in an organic solvent with chlorosulfonic acid (C1SO3 H) at 0-10 degrees C, the resulting mixture is made alkaline in III, and a phase is collected from this alkalized mixture. aqueous containing an alkali salt of 2-hydroxy-1naphthalenesulfonic acid AA, which is aminated in VII to give an aqueous mixture of alkali salts and ammonia of Tobias acid, which is extracted in X by means of a organic solvent immiscible with water, while the aqueous phase is acidified in XI. According to the invention, the reaction mixture of I is transferred to a reserve vessel II where it remains for 5 to 60 minutes at 0-10 degrees C before basifying; in addition, the acidification in XI is carried out at 20-80 degrees C up to pH 1.8-2.5. This gives a Tobias acid containing a very low content of 2-aminonaphthalene, a carcinogenic product. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398723-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398726-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398725-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398721-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2398722-A1 |
| priorityDate | 1977-07-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 44.