http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2021017649-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c6761bcd867937504e0018c7e2c4bb63 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D213-84 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D213-84 |
| filingDate | 2020-06-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ac213873cdfeca7e3a3b88a04840a0e4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9d48cc90fc6d11682c2d4305c12ac4d3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_34cfe41ef54668237af76a756ca77497 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_abbf28133069971b972f7399b5af7ea5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7325429b044d2f77ebde68a2e6c4d6f4 |
| publicationDate | 2021-02-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-2021017649-A1 |
| titleOfInvention | Method for purifying 4-cyanopyridine by means of melting and crystallizing |
| abstract | Disclosed is a method for purifying 4-cyanopyridine by means of melting and crystallizing, comprising the following steps: (1) Melting 4-cyanopyridine: adding crystals of 4-cyanopyridine into a reactor under normal pressure and melting the crystals of 4-cyanopyridine at a reactor temperature controlled to be 80-90°C; (2) Temperature reduction: reducing the temperature of molten 4-cyanopyridine to 71.5-73.5°C at a certain temperature reduction rate by performing temperature control on the reactor; (3) Crystallization: enabling crystallization at a maintained temperature of 71.5-73.5°C; and (4) Separation and extraction: discharging the base solution from the resulting crystals, increasing the reactor temperature to 80-90°C again, and melting the resulting crystals to obtain a finished 4-cyanopyridine product. The method for purifying 4-cyanopyridine by means of melting and crystallizing according to the present invention has a simple process, and can increase the overall productivity and purity of the finished product, without any resulting by-products and contaminants, by means of controlling the rate of temperature reduction during temperature-reduction crystallization to avoid a peritectic phenomenon. |
| priorityDate | 2019-08-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 29.