http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114716397-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-584 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D2009-0086 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J2523-00 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-88 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J23-6525 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J35-008 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J23-002 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-083 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J23-652 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-88 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-083 |
| filingDate | 2022-03-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2022-09-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2022-09-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-114716397-B |
| titleOfInvention | A kind of preparation method of phthalic anhydride atmospheric hydrogenation to produce phthalide |
| abstract | The invention relates to a method for preparing phthalide by atmospheric hydrogenation of phthalic anhydride. Hydrogen reaction; the product after hydrogenation is selected to enter the distillation tower to recover the hydrogenation solvent for recycling, and the product at the bottom of the distillation tower is dissolved with acetone; the dissolved solution is mixed with the phthalide elution agent into the phthalide solution containing a trace amount of phthalide seed crystals for elution The tank is crystallized and separated, the supernatant liquid of the phthalide elution tank enters the rectification tower, the acetone is recovered from the top of the rectification tower, the phthalide elution agent is recovered in the rectification tower tower, and the by-product toluic acid is discharged from the bottom of the rectification tower. , The bottom product of the phthalide elution tank is dried to obtain high-purity phthalide. Compared with the prior art, the present invention has the following advantages: the preparation method of the present invention improves the utilization rate of phthalic anhydride, increases its added value, improves product purity, can produce high-purity phthalide and toluic acid, and has a simple process, mild operating conditions, Save investment. |
| priorityDate | 2022-03-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 64.