Method for producing butadiene from butanediols

The invention relates to a method for producing 1,3-butanediene from a butanediol feedstock, comprising at least: a) a step of esterification of the butanediol with a carboxylic acid in order to form the corresponding diester, said step being supplied with the butanediol feedstock and with carboxylic acid comprising a carboxylic acid feedstock and the pyrolysis liquid effluent from step b), and producing at least one carboxylic acid effluent and a diester effluent; b) a step of pyrolysis of the diester effluent from step a) comprising a reaction section and a separation section and producing at least one pyrolysis liquid effluent including at least 50 wt.-% carboxylic acid and a pyrolysis steam effluent comprising more than 90 wt.-% butadiene; c) a distillation step supplied with at least the carboxylic acid effluent from step a) and producing an aqueous distillate and a carboxylic acid residue; d) a step of drying the carboxylic acid, supplied at least with the carboxylic acid residue from step c) and producing a water effluent and a carboxylic acid product with which step a) is supplied.