| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e938e28337fbaa9944d781f3ccf86b5e |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-573
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-487 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-487
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-573 |
| filingDate |
1973-10-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1976-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_99f64fd6f85b2be637cf09261465922d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9f0bd69d4e84f4a82114f61497cde5ff |
| publicationDate |
1976-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3939183-A |
| titleOfInvention |
Purification of maleic anhydride |
| abstract |
A method for obtaining purified polycarboxylic anhydrides of good color stability which comprises combining and contacting a metal halide and P2O5 or a perborate with the crude anhydride before final distillation of the crude anhydride. Preferred metal halides are alkaline earth and transition metal halides, with magnesium, calcium and iron chlorides being particularly preferred. The method is especially advantageously applied to maleic anhydride purification, especially maleic anhydride produced by butane oxidation. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8383633-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5972174-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4961827-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6090245-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2011236478-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5728776-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6120654-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8268811-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2009221602-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6380320-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010215772-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4260546-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4257958-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010317641-A1 |
| priorityDate |
1973-10-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |