| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f3aa99e92b4b3cb687c7b2c1ff89bebf |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-265 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-265 |
| filingDate |
1979-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1983-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dee384e09a5bb5f9b471ea4da356339c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b35293bdde4a05d4a39fb2de821a0621
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5597f4e7e2a7cb1113ad855a4861d793 |
| publicationDate |
1983-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4387243-A |
| titleOfInvention |
Continuous production of ortho-phthalic acid product by two-step catalytic neat oxidation of liquid ortho-xylene with air |
| abstract |
An improved two-step catalytic neat oxidation of liquid xylene is provided wherein there is no separation of oxidation products from the first oxidation step nor minimum limitation imposed on the liquid o-xylene concentration entering the second step according to the prior two-step oxidations of o-xylene. Rather the first step is conducted under conditions such that the liquid effluent from the first step contains from 6 up to 30 weight percent liquid o-xylene and from 8 up to 40 weight percent o-phthalic acid and such effluent is directly oxidized with air in the second step. By such improved two-step oxidation there is obtained a liquid product containing o-phthalic acid in yields of up to 85-87% of the theoretical yield and also containing impurities separable from o-phthalic acid after it has been converted to its anhydride in vapor form and the anhydride vapors are separated from water vapor. Such two step neat oxidation of liquid o-xylene provides a route to phthalic anhydride commercially competitive with routes starting with the vapor phase oxidation of o-xylene. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0138280-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006004224-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6657068-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006004223-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6657067-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6649773-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104418748-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104418748-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008275211-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7541489-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6469205-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7732559-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2003514883-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6465685-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6399790-B1 |
| priorityDate |
1979-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |