http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-105294577-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D239-69 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D239-69 |
| filingDate | 2015-11-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2017-11-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2017-11-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-105294577-B |
| titleOfInvention | A kind of preparation method of the methoxy pyrimidine of sulfanilamide (SN) 6 |
| abstract | The invention discloses a kind of preparation method of the methoxy pyrimidine of sulfanilamide (SN) 6, concretely comprise the following steps：The methoxy pyrimidine sodium crude product of sulfanilamide (SN) 6 is soluble in water, after activated carbon decolorizing filters, filtrate adds ammoniacal liquor and solid ammonium sulfate, is evaporated under reduced pressure to without ammonia taste, again with sulphur acid for adjusting pH value 4~7, then the methoxy pyrimidine sterling of sulfanilamide (SN) 6 is obtained after decrease temperature crystalline filtering, washing, drying.Present invention utilizes the property that ammonium sulfate is thermally decomposed, at reduced pressure conditions, the ammonia generated after being thermally decomposed by the ammoniacal liquor and ammonium sulfate that progressively remove addition, the pH value of reaction system is steadily declined simultaneously, so as to which the methoxy pyrimidine of sulfanilamide (SN) 6 can be separated out slowly, it is not easy to sandwich impurity.Meanwhile the ammonia being removed under reduced pressure can use sulfuric acid solution to absorb, the ammonium sulfate of formation is recyclable, so as to be advantageous to the protection to environment. |
| priorityDate | 2015-11-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.