Production of pyromellitic dianhydride

Details Production of pyromellitic dianhydride Production of pyromellitic dianhydride

1974-07-01

1976-11-16

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603463, C07D30789

Patent

active

039924181

ABSTRACT:
Pyromellitic dianhydride is produced by reacting pseudocumene with propylene in the presence of an alkylation catalyst, said propylene being present in a stoichiometric excess, to produce 2,4,5-trimethylcumene and diisopropyl-substituted pseudocumenes, treating the resultant 2,4,5-trimethylcumene and diisopropyl-substituted pseudocumenes with an oxygen-containing gas in the presence of a catalyst comprising a vanadium-containing compound dispersed on an inorganic oxide support to produce a treatment product comprising pyromellitic dianhydride and a polycarboxylated compound, decarboxylating the polycarboxylated compound and recovering the resultant pyromellitic dianhydride.

REFERENCES:
patent: 3723516 (1973-03-01), Muller et al.

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