Patent ID: 7357855

Claim:
A process for chemical conversion of a feed comprising A) feeding a feed into a chemical conversion reactor containing a substantially vertical catalytic bed comprising a substantially vertical catalytic bed comprising between an upper end and a lower end of the reactor at least two separate substantially vertical catalytic zones arranged in series to each other with respect to the flow of a feed such that said feed is able to traverse each separate catalytic bed in succession; close to the upper end of the reactor, at least one means for introducing a solid catalyst; means for introducing and evacuating said feed allowing its flow in a substantially horizontal direction through the at least two separate substantially vertical catalytic zones in succession in said catalytic bed; means for heating said feed integrated into said reactor; close to the lower end of the reactor, means for extraction of the catalyst from each of the at least two separate substantially vertical catalytic zones independently of each other, and B) renewing catalyst at a higher rate or more frequently at the downstream portion of the catalytic bed than at the upstream portion of the catalytic bed.