http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0031299-A2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e9445e5e3626f36e932c6451a928250 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C309-00 |
| classificationIPCInventive | 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/C07C303-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-47 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 |
| filingDate | 1980-12-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bd2b0afbca59a1deba632c5efc3a47ef http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d1483c62245fbecaef222e4ba1344b1f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e3fe741c38b9dd1203dc3468b0b936c5 |
| publicationDate | 1981-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0031299-A2 |
| titleOfInvention | Process for the preparation of 2-amino-1-naphthalene sulfonic acid |
| abstract | The invention relates to an improved process for the preparation of 2-amino-1-naphthalenesulfonic acid (Tobias acid). The improved process for the production of TS allows the production of its TS, which has only a very low content of 2-amino-naphthalene, and is characterized by high space-time yields.n n n a.) Die Sulfonierung zu 2-Hydroxynaphthalin-1-sulfonsäure mittels Chlorsulfonsäure in einem reaktionsinerten organischen Lösungsmittel. b.) Der Neutralisation der freigesetzten und noch im Reaktionsmedium vorhandenen Salzsäure bzw. überschüssigen Chlorsulfonsäure und Umwandlung der entstandenen 2-Hydroxynaphthalin-1-sulfonsäure in das entsprechende Ammoniumsalz mittels Ammoniak. c.) Der Bucherer-Reaktion zur Umwandlung der 2-Hydroxyin die 2-Amino-Gruppe mittels Ammoniak und d.) die anschliessende Ausfällung der entstandenen TS mittels verdünnter Schwefelsäure. The process starts with 2-hydroxynaphthalene and goes through the following main reaction stages: a.) The sulfonation to 2-hydroxynaphthalene-1-sulfonic acid using chlorosulfonic acid in an inert organic solvent. b.) The neutralization of the liberated hydrochloric acid or excess chlorosulfonic acid still present in the reaction medium and conversion of the resulting 2-hydroxynaphthalene-1-sulfonic acid into the corresponding ammonium salt by means of ammonia. c.) The Bucherer reaction for converting the 2-hydroxy into the 2-amino group using ammonia and d.) the subsequent precipitation of the resulting TS using dilute sulfuric acid. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4908478-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0218005-A1 |
| priorityDate | 1979-12-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 91.