http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108610291-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D231-16 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D231-16 |
| filingDate | 2018-06-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2020-06-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2020-06-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-108610291-B |
| titleOfInvention | Preparation method of 3, 4-dinitropyrazole |
| abstract | The invention relates to a preparation method of 3, 4-dinitropyrazole. The preparation method of the 3, 4-dinitropyrazole comprises the following steps: 1) nitration: adding concentrated sulfuric acid into a four-mouth bottle, slowly dropwise adding fuming nitric acid, keeping the temperature below 35 ℃, heating the reaction solution to 50 ℃, starting to slowly add 3-nitropyrazole, controlling the feeding temperature to be below 80 ℃, heating to 80-120 ℃ after adding, keeping the temperature for reaction for 0.5-1h, cooling, and cooling to 50 ℃ to separate out white solid; 2) and (3) filtering: cooling the reaction liquid to 25 ℃, and performing suction filtration by using a sand core funnel; 3) washing, filtering and drying: washing the filter cake with 150g of ice water, performing suction filtration, and drying in an oven to obtain white 3, 4-dinitropyrazole solid particles; 4) and (3) recrystallization: 3, 4-dinitropyrazole is put into water, then heated to 50 ℃ until the dinitropyrazole is completely dissolved, and then cooled to 10 ℃ to separate out white granular 3, 4-dinitropyrazole, and then the granular 3, 4-dinitropyrazole is pumped, filtered and put into an oven to be dried according to the steps. |
| priorityDate | 2018-06-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.