http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-107868074-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D319-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D319-12 |
| filingDate | 2016-09-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-02-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-02-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-107868074-B |
| titleOfInvention | Purification method of glycolide |
| abstract | The invention relates to a purification method of glycolide, which mainly solves the problem that impurities with large molecular weight are difficult to remove in the recrystallization process in the prior art. A refining method by using glycolide comprises the following steps: 1) dissolving a crude glycolide product obtained by depolymerization reaction in a solvent I, and filtering to remove insoluble substances; 2) heating and distilling the collected filtrate to remove the solvent I to obtain solid-phase crude glycolide; 3) mixing and stirring the crude glycolide obtained in the step 2) by using a solvent II, filtering the solid-liquid mixture to collect a filter cake, repeating the operation for at least 3 times, and then drying the filter cake in vacuum to obtain a refined glycolide product; wherein the solvent I is at least one of dichloromethane, tetrahydrofuran, acetone, ethyl acetate and 1, 4-dioxane; the solvent II is at least one of alcohols, ethers, esters and ketones, so that the problem is solved well, and the method can be used in industrial production of glycolide. |
| priorityDate | 2016-09-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 39.