Process for continous olefin hydrocarbon isomerization with catalyzing regenaeration

Continuous process for the isomerisation of n-olefins containing at most 20 carbon atoms, in the presence of a catalyst, in which a charge containing the said n-olefins is made to move through at least one mobile bed reaction region, the catalyst flowing into each reaction region. The catalyst drawn off from the last reaction region is conveyed into a regeneration region and is reintroduced, at the exit of the latter, close to the first reaction region. According to the process, the catalyst drawn off from the last reaction region is conveyed, after regeneration, into a region where it is subjected to a steam treatment before reintroduction into the first reaction region. The process is implemented in the presence of steam.