Process for the production of butadiene from ethanol with optimized 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 4 or one of its multiples, comprising a catalyst, said regeneration step comprising 4 regeneration phases successive, said step b) also implementing three regeneration loops. Figure 1 to be published