http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-106748788-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-46 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-72 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-54 |
| filingDate | 2016-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2020-03-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2020-03-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-106748788-B |
| titleOfInvention | Production method for recycling ethyl acetoacetate at low boiling point |
| abstract | The invention discloses a production method for low-boiling recovery of ethyl acetoacetate, which comprises the steps of adding ethanol and a catalyst triethylene diamine into a reaction kettle, heating up for reflux, dropwise adding diketene, preserving heat, cooling reaction liquid after the reaction is finished, adding concentrated sulfuric acid, preserving heat, filtering, continuously rectifying filtrate, rectifying to obtain low-boiling-point substances, esterifying the low-boiling-point substances by adding acid, heating up for reflux for 1-2 h, rectifying at normal pressure to obtain the low-boiling-point substances, finishing rectification when the kettle temperature is raised to 115-125 ℃, cooling to 40-50 ℃, neutralizing by using solid alkali, and feeding the neutralized materials into a conventional negative pressure rectification system to rectify an ethyl acetoacetate finished product, wherein the content of the finished product ethyl acetoacetate is more than 99.0%, the acidity is less than 0.05%, and the recovery rate of the product is more than 95%. The method reduces the loss of the ethyl acetoacetate, improves the total yield of the ethyl acetoacetate, recycles resources and reduces the cost. |
| priorityDate | 2016-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 34.