http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-107778244-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | 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/C07D223-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-16 |
| filingDate | 2017-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-03-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-03-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-107778244-B |
| titleOfInvention | Method for refining and purifying caprolactam |
| abstract | The invention discloses a method for refining and purifying caprolactam. Crystallizing low-water-content crude caprolactam at normal temperature to obtain a part of high-quality caprolactam, crystallizing high-water-content normal-temperature crystallization mother liquor and distillation raffinate at low temperature, and distilling to obtain the other part of high-quality caprolactam, wherein the low-temperature crystallization mother liquor is evaporated to obtain a circulating material participating in normal-temperature crystallization. The invention adopts a normal and low temperature combined crystallization mode and combines the processes of distillation and evaporation to realize the high-efficiency refining and purification of the impurity-containing caprolactam. The invention has low energy consumption, less waste liquid discharge, low production cost and improved safety when being crystallized at normal and low temperature; the invention has high product yield, short process flow and low equipment investment; the method has the advantages of no intervention of organic solvent, single process and great reduction of production cost; the caprolactam obtained by the method has good quality, and each index is superior to the standard of national standard superior products; less discharge of three wastes and less environmental pollution. |
| priorityDate | 2017-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 36.