| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C303-22 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-50
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C301-00 |
| filingDate |
1978-06-28^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1979-09-04^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5d5e8feffb1094e85d8adc199d956747
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d300a6b65efb4fdc66b8056e97d2f125
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_de075bb25ad762672f15304893e23011 |
| publicationDate |
1979-09-04^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4166826-A |
| titleOfInvention |
Process for the preparation of 1-amino-8-naphthol-3,6-disulphonic acid (H-acid) |
| abstract |
A process has been invented for the preparation of a mono-alkali metal of 1-amino-8-naphthol-3,6-disulphonic acid, comprising reacting 1-naphthylamine-3,6,8-trisulphonic acid and/or a salt thereof and/or a naphthylamine trisulphonic acid isomer mixture and/or salt thereof with an alkali metal hydroxide solution in the presence of an alcohol and/or alcoholate and in the presence of a substance which contains at least one oxygen atom bonded to a nitrogen atom, at elevated pressure and elevated temperature, and separating out the mono-alkali metal salt of 1-amino-8-naphthol-3,6-disulphonic acid by acidification. The process results in the procurement of higher yields of the desired product and in the formation of less by-products. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4609503-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-107986997-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109096154-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1057521-C
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4426334-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108003071-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4325889-A |
| priorityDate |
1977-07-16^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |