http://rdf.ncbi.nlm.nih.gov/pubchem/patent/BR-9911715-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d648658dd620f548c24de39659a5e9e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-487 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-487 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-24 |
| filingDate | 1999-03-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9e6e6d8ad747d4ce134ac5433cdfc831 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6c7a1549e0ad30b5f002a6db97c30271 |
| publicationDate | 2001-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | BR-9911715-A |
| titleOfInvention | Purification process of aromatic dicarboxylic acids |
| abstract | "PROCESS OF PURIFICATION OF AROMATIC DICARBOXYLIC ACIDS" Process of purification of aromatic dicarboxylic acid by oxidizing m-xylene or p-xylene to produce crude isophthalic acid or crude terephthalic acid, respectively. The products of the oxidation step are hydrogenated in the presence of a palladium catalyst. Carbon monoxide is introduced during the hydrogenation step. The palladium catalyst is provided on a carbon substrate. The products of the oxidation step are dissolved in a solvent, which can be water, prior to the hydrogenation step. The products of the oxidation step can be dissolved at an elevated temperature, above the normal boiling point of the solvent. The oxidation step produces isophthalic acid, 3-carboxybenzaldehyde and fluorenones in the case of oxidation of m-xylene and produces terephthalic acid, 4-carboxybenzaldehyde and fluorenomas in the case of oxidation of p-xylene. It can be beneficial to monitor the disappearance of 3-carboxybenzaldehyde in the case of oxidation of m-xylene and 4-carboxybenzaldehyde in the case of oxidation of p-xylene, and reduction of the amount of carbon monoxide when the rate of disappearance is below a predetermined minimum . After the hydrogenation step, isophthalic acid or terephthalic acid can be crystallized. Carbon monoxide can be maintained at a concentration of 100 to 500 ppm based on added hydrogen and carbon monoxide. Other aromatic dicarboxylic acids can also be purified using this procedure. |
| priorityDate | 1998-06-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 35.