http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112142637-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D201-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D223-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D201-16 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D223-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-06 |
| filingDate | 2020-09-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2022-09-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2022-09-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-112142637-B |
| titleOfInvention | Refining method and refining system of caprolactam |
| abstract | The invention relates to the field of caprolactam production, in particular to a refining method and a refining system for caprolactam. The method comprises: subjecting crude caprolactam to first evaporative crystallization and first solid-liquid separation to obtain first caprolactam crystals and first crystallization mother liquor; The first caprolactam crystal is washed to obtain the second caprolactam crystal; the first crystallization mother liquor is optionally concentrated, and the second evaporative crystallization and the second solid-liquid separation are carried out to obtain the third caprolactam crystal and the second crystallization mother liquor; the third caprolactam crystal is Carry out the second washing to obtain the fourth caprolactam; optionally concentrate the second crystallization mother liquor, carry out constant temperature crystallization, and separate and obtain the fifth caprolactam crystal and the third crystallization mother liquor; wash the fifth caprolactam crystal to obtain the sixth caprolactam crystal; The second caprolactam crystal is subjected to hydrogenation reaction; the constant temperature crystallization solvent of constant temperature crystallization contains solvent A and ethanol. The present invention can ensure the yield and quality of caprolactam. |
| priorityDate | 2020-09-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 164.