US 5,474,960 A · Process for reactivating a fluid bed catalyst in a reactor dipley

Abstract

The present invention relates to improvements of fluid bed catalysts. More particularly, the present invention relates to improvements of fluid bed oxidation catalysts useful in the preparation of maleic anhydride from C.sub.4 hydrocarbons, including n-butane. The present invention includes a process of contacting a fluid bed catalyst with a reactivating agent in a catalyst standpipe. The present invention also provides a catalyst containing the mixed oxides of vanadium and phosphorus, treated using the above process. The present invention further provides a process for producing maleic anhydride, utilizing the catalyst prepared using the above process. The present invention additionally provides for a reactor standpipe, utilized for regenerating catalyst according to the above process.

Claims26

Dependent claims

A process for maintaining the performance of fluid bed oxidation catalysts containing the mixed oxides of vanadium and phosphorus, which comprises:

(a) removing a portion of said fluid bed catalyst from the reaction zone of a fluidized bed to at least one reactor dipleg;
(b) contacting said portion of the fluid bed catalyst in said dipleg with a reactivating agent;
and
(c) returning said fluid bed catalyst from said dipleg to the reaction zone of said fluidized bed.

1 more element

Dependencies are inferred from the claim text.

Process for reactivating a fluid bed catalyst in a reactor dipley

Life of this patent

Process for reactivating a fluid bed catalyst in a reactor dipley

Life of this patent

Abstract

Claims26