Maleic anhydride production using thallium-vanadium modified pho

Details Maleic anhydride production using thallium-vanadium modified pho Maleic anhydride production using thallium-vanadium modified pho

1977-11-21

1979-03-06

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252437, C07D30760

Patent

active

041430565

ABSTRACT:
A lower unsaturated aliphatic hydrocarbon of at least 4 carbon atoms and an oxygen-containing gas react to form maleic anhydride in the presence of a catalyst having the oxides of tungsten, phosphorus, thallium, and vanadium, said catalyst being a phosphotungstic catalyst modified by minor amounts of thallium oxide and vanadium oxide, the sum of the oxides of Tl and V constituting from 1% to 15% of the catalyst, the atom ratio of Tl:V being within a range from about 2:1 to about 8:1 and the overall atomic ratios are such that W:P:Tl:V corresponds to 1:0.1-0.7:0.01-0.16:0.01-0.1. Sometimes from about 3 to about 50 volume percent steam is added to the reactant stream to enhance catalyst stability and selectivity.

REFERENCES:
patent: 4003920 (1977-01-01), Ueeda
Ai, J. of Catalysis 49, p. 313-319 (1977).

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