http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113019124-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f920fb917a41f1f68c689def08dbba7c |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F6-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G65-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D61-027 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D61-026 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F26-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F20-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F6-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F20-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D61-02 |
| filingDate | 2019-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_87782ff6d54a692ffdb4a3d6115700a8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6931f46bc8e74c1efd84d993e06037cb |
| publicationDate | 2021-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-113019124-A |
| titleOfInvention | Preparation and Purification of Cyclic Polymers by Membrane Method |
| abstract | The invention discloses a membrane method for preparing and purifying a cyclic polymer. The present invention adopts a nanofiltration membrane system, and at the same time of "closing the ring", the nanofiltration membrane selectively intercepts the linear polymer while passing through part of the "ring closing" product, and the molecular weight cut off is 1800-2200; The nanofiltration membrane separates the reaction system, and the concentrated water returns to the reaction system to continue the reaction; with the discharge of the nanofiltration product water, the reaction system needs to continuously replenish purified water, and this cycle is completed until the reaction is completed; the first-stage nanofiltration product water is recycled. Concentration is carried out by secondary nanofiltration, the molecular weight cut off is 300-500, and the concentrated water of secondary nanofiltration is the target product after removing small molecular impurities. The method of the invention can greatly improve the synthetic yield of the cyclic polymer. |
| priorityDate | 2019-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 24.