http://rdf.ncbi.nlm.nih.gov/pubchem/patent/IT-1311932-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_68819f0418f35cbfbdb618e73259f467 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F- |
| filingDate | 1999-04-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2002-03-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7d5376a0f7ba83c5675397261b96d140 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_946a278dd3a5e968628bd732c52600f0 |
| publicationDate | 2002-03-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | IT-1311932-B1 |
| titleOfInvention | PYROMELLITE DIANHYDRIDE PREPARATION PROCEDURE. |
| abstract | Pyromellitic dianhydride is made by oxidation of 1,2,4,5-tetra-alkylbenzene using a catalyst comprising mixed oxides of: (a) vanadium and tungsten; (b) Group IA and/or IIA metals; (c) manganese, antimony, bismuth, phosphorus, copper, aluminum and/or titanium; and (d) a Group VIIIB metal, on a rutile/(tungsten and/or silicon carbide) support. The production of pyromellitic acid dianhydride comprises: (1) preparation of a starting material containing 1,2,4,5-tetra-alkylbenzene of formula (I): and (2) selective oxidation of (I) at 300-450 [deg]C in presence of a catalyst system comprising: (A) a support consisting of rutile and tungsten carbide and/or silicon carbide; (B) a catalyst based on a mixture of vanadium and tungsten oxides; and (C) a cocatalyst based on a combination of (c1) a Group IA and/or IIA metal oxide, (c2) oxide(s) of Mn, Sb, Bi, P, Cu, Al and/or Ti and (c3) a Group VIIIB metal oxide, giving a catalyst/cocatalyst combination of formula (II): [Image] R 1 : CH 3; R 2, R 3, R 4 : 1-3C alkyl [Image] V : vanadium; MI : tungsten; MII : Mn, Sb, Bi, P, Cu, Al and/or Ti; MIII : a Group VIIIB element; MIV : an alkali and/or alkaline earth metal; a : 0.1-10; b : 0.01-1; c : 0-0.5; d : 0.01-0.6; X = 7-40. |
| priorityDate | 1999-04-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 44.