http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108299202-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-54 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-54 |
| filingDate | 2018-01-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2020-10-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2020-10-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-108299202-B |
| titleOfInvention | Method for continuously recovering PGMEA from PGMEA/aqueous solution by extractive distillation |
| abstract | The invention discloses a method for continuously recovering high-purity PGMEA from PGMEA/aqueous solution by extractive distillation, which comprises the steps of destroying the azeotropy of PGMEA and water by adding an extractant of ethyl benzyl ether, extracting PGMEA from a mixed solution by the extractant, obtaining the mixed solution of water, PGMEA and the extractant from the tower top, removing wastewater from a water phase after phase splitting, returning an organic phase to an extractant temporary storage tank, and feeding the organic phase into an extractive distillation tower again; and (3) extracting a mixed solution of PGMEA and the extractant from the tower bottom of the extraction rectification tower, separating in a reduced pressure rectification tower, obtaining a PGMEA product at the tower top of the reduced pressure rectification tower, and recycling the entrainer in the tower bottom. The organic matter content in the waste water discharged by the invention is reduced to extremely low concentration, and the waste water can be discharged after simple treatment, thereby reducing the treatment capacity of the waste water containing organic matters, reducing the concentration of the organic matters in the waste water and greatly reducing the pollution to the environment. |
| priorityDate | 2018-01-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 19.