http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110746435-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J2231-70 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J31-128 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D493-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-12 |
| filingDate | 2019-10-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2022-04-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2022-04-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-110746435-B |
| titleOfInvention | Method for producing pyromellitic acid dianhydride by continuous oxidation of pyromellitic toluene at low temperature in liquid phase |
| abstract | The invention discloses a method for producing pyromellitic dianhydride by continuous low-temperature liquid-phase oxidation of mesitylene in the technical field of chemical production. The liquid is continuously pumped into the oxidation reaction tower, and oxygen-enriched gas is continuously fed into the tower while the liquid is fed, keeping the temperature in the oxidation reaction tower at 200-300°C, and the pressure in the tower at 0.5-3MPa. The generated pyromellitic acid has a low density and floats on the upper layer of the liquid surface; the liquid surface with a high content of pyromellitic acid is extracted for flash evaporation to evaporate the light components, and the bottom of the tank can obtain pyromellitic acid Crude product; the crude product of pyromellitic acid is recrystallized and centrifuged to obtain crystals of pyromellitic acid, and then dehydrated to obtain pyromellitic dianhydride. The amount of bromine in the catalyst is small, which reduces the corrosion of equipment; the process is simple, easy to realize, and is beneficial to the industrial production of pyromellitic dianhydride. |
| priorityDate | 2019-10-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 50.