| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_75a9b43328a2cbfcf60da8b223a321c7 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-43 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-43 |
| filingDate |
1972-03-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1975-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_acb6add7473923f71362afa258b2b7c3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f8cdcc21f14d9d7072eebe252c8af1cc |
| publicationDate |
1975-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3917681-A |
| titleOfInvention |
Purification of isophthalic acid |
| abstract |
A process for purifying isophthalic acid produced by the air oxidation in the liquid phase of a xylene isomer in an acetic acid diluent is disclosed. The crude acid product is dissolved in an acetic acid-water solvent (75 to 99 wt. percent acetic acid) and passed through a three-stage recrystallization process. About one-third of the isophthalic acid is crystallized in each stage. The second-stage product can be separated to yield isophthalic acid crystals containing essentially no terephthalic acid. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2185497-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2185497-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5583254-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8247605-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4350828-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010004484-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/BE-1005487-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9144750-B2 |
| priorityDate |
1969-05-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |