Method for producing butadiene from ethanol with in situ regeneration of the catalyst of the second reaction step

摘要

The present invention relates to a process for the production of butadiene from ethanol, in two reaction stages, comprising a stage a) of conversion of ethanol into acetaldehyde and a stage b) of conversion into butadiene, said stage b) bringing into play simultaneously operates a reaction step and a regeneration step in (n + n / 2) fixed bed reactors, n being equal to 2 or one of its multiples, comprising a catalyst, said regeneration step comprising 4 regeneration phases successive, said step b) also implementing a regeneration loop for the inert gas and at least one regeneration loop for the gas streams comprising oxygen. Figure 1 to be published