Process for the regeneration of a catalyst
AssigneesABB Lummus Global Inc., Lonza Societa Per Azioni, Tonen Chemical Corporation
InventorsTatsumi Ichiki, Nagato Hamashima, Teiji Nakamura, Masayuki Asami, Sadakatsu Suzuki, Hiroshi Ueno
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Abstract
A process is provided for the regeneration of a vanadium-phosphorus oxide catalyst which has been used in a process for the preparation of maleic anhydride by oxidizing butane. The used catalyst particles are removed from the fluidized bed reactor and subjected to impact with each other and/or with structural surfaces such that the deteriorated layer is peeled away. Various forms of equipment may be employed such as pneumatic classifiers, jet mills and jetted fluidized beds.
Claims6
A process for the regeneration of a used catalyst in a process for the preparation of maleic anhydride by oxidizing a hydrocarbon having four carbon atoms in a fluidized bed reactor, wherein said used catalyst comprises particles of vanadium-phosphorus oxide compounds having a deteriorated outer layer of said vanadium-phosphorus oxide, said process comprising the steps of removing at least a portion of said used catalyst particles from said reactor, subjecting said removed used catalyst particles to impact whereby said deteriorated outer layer of said vanadium-phosphorus oxide is peeled away leaving regenerated catalyst particles, separating said peeled away deteriorated outer layer of said vanadium-phosphorus oxide from said regenerated catalyst particles and returning said regenerated catalyst particles to said reactor.
Dependencies are inferred from the claim text.