http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109666032-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D493-04 |
| filingDate | 2018-12-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2020-07-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2020-07-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-109666032-B |
| titleOfInvention | Preparation method of pyromellitic anhydride |
| abstract | The invention discloses a preparation method of pyromellitic dianhydride, which comprises the following steps: (1) pseudocumene reacts with dichloroethane for 0.5 to 5 hours in an organic solvent under the catalytic action of aluminum trichloride or ferric trichloride to generate 2,2 ', 4,4 ', 5,5 ' -hexamethyl diphenylethane; hydrolyzing and removing the solvent to obtain a crude product of 2,2 ', 4,4 ', 5,5 ' -hexamethyl diphenylethane; (2) heating and gasifying the crude product of 2,2 ', 4,4 ', 5,5 ' -hexamethyl diphenylethane, and collecting the product to obtain pyromellitic dianhydride under the action of a catalyst and through air oxidation at the reaction temperature of 350-500 ℃. The preparation method of pyromellitic dianhydride disclosed by the invention has the advantages of product selectivity of over 90%, good yield, low cost and industrial production. |
| priorityDate | 2018-12-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.