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US 4,791,080 AGranted
Oxidative catalyst regeneration
AssigneeRohm Co., Ltd.
InventorsWilheim Gruber, Klaus Langerbeins, Wolfgang Ruppert
Life of this patent
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Abstract
Method for regenerating catalysts containing molybdenum, phosphorus, and vanadium in oxidic association and useful for the oxydehydrogenation of isobutyric acid or its lower esters to form methacrylic acid or its lower esters, by oxidizing the spent catalyst with an oxygen containing gas at temperatures from 200.degree. C. to 400.degree. C., suitably intermittently and in alternation with oxydehydrogenation.
Claims3
A method for regenerating a solid catalyst used in oxydehydrogenation of isobutyric acid or its lower esters to form methacrylic acid or its lower esters, having the formula
- H.sub.a M.sub.b PMo.sub.d V.sub.e O.sub.40
- wherein
- M is at least one metal ion,
- a has a value from 0 to 6,
- b has a value from 0 to 6,
- d has a value from 9 to 12
- e has a value from 0 to 3,
- a+bz has a value equal to or greater than 3, and
- a+bz is equal to 75-6d-5e, where z is the valence of metal ion M,
- which method comprises contacting said solid catalyst at a temperature from 200.degree. C. to 400.degree. C. with a gas containing from 5 to 40 volume percent of elemental oxygen, said gas having a pressure from 0.1 bar to about 5 bar.
7 more elements
Dependencies are inferred from the claim text.