http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110642780-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D213-69 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D213-69 |
| filingDate | 2019-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2022-10-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2022-10-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-110642780-B |
| titleOfInvention | A kind of method of purifying yellow pyridine hydrochloride |
| abstract | The invention relates to a method for purifying yellow pyridine hydrochloride. ‑2.5h; ‑0.095～‑0.1MPa, 40‑50℃, recover thionyl chloride for 3‑5h, the recovery ends when the material in the kettle is solid, control the temperature to 45‑55℃; keep the temperature at ‑0.095～‑0.1MPa for 7 ‑9h, add anhydrous ethanol to dissolve for 1.5‑2.5h, control the mass ratio of 2‑chloro‑3,4‑dimethoxypyridine hydrochloride to anhydrous ethanol to 1:1, heat to 50‑55℃, keep the temperature for 1.5‑ After 2.5 hours, it was transferred to the freezing crystallization kettle; cooled to 0-5°C, centrifuged, and dried. Advantages of the present invention: 1. Utilizing the relevant equipment of the original B7 chlorination section, no equipment investment is required, and the equipment cost investment is saved; 2. The appearance of the product obtained by this method is nearly white, and the purity is as high as 99.5 or more, which increases the added value of the product; 3 The method is easy to operate, safe and efficient, no three wastes are generated, and the recovered thionyl chloride can be recycled. |
| priorityDate | 2019-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 20.