Process for producing diolefins from a dilute diol feedstock, i.e. a feedstock containing from 1% to 30% by weight of diol, comprising at least the following steps: a) an acetalization step, comprising a reaction-separation section fed with said dilute diol feedstock and with a carbonyl feedstock comprising at least the carbonyl effluent resulting from the esterification step b), carried out in the presence of an acid catalyst present at a concentration of between 1 and 3 mol% relative to the diol included in said dilute diol feedstock, at a temperature of between 5°C 100°C, the molar ratio of the carbonyl compound included in said carbonyl feedstock to the diol included in said dilute diol feedstock feeding said reaction-separation section being between 1 and 10 and also comprising at least one separation section so as to produce at least one water effluent and one acetal effluent, b) an esterification step comprising a reaction-separation section fed with the acetal effluent resulting from step a) and comprising at least one separation section treating, by distillation, the effluents of said reaction-separation section and producing at least one water effluent, one carbonyl effluent, one concentrated carboxylic acid effluent and one diol diester residue, said reaction-separation section also being fed with a carboxylic acid feedstock comprising at least said concentrated carboxylic acid effluent, said reaction-separation section operating in the presence of an acid catalyst, at atmospheric pressure and at a temperature of between 20°C and 250°C, the amount of catalyst used being between 1 and 5 mol% relative to the amount of acetal introduced, the carboxylic acid/acetal molar ratio at the inlet of said reaction-separation section being between 2 and 20, c) a step of pyrolysis of said diol diester residue resulting from step b) comprising a pyrolysis reactor fed with said diol diester residue, operated at a temperature of between 500°C and 650°C so as to produce a pyrolysis effluent, said step c) also comprising at least one separation section in which said pyrolysis effluent is cooled to a temperature below 100°C so as to produce a liquid pyrolysis effluent and a vapor pyrolysis effluent, and in which said vapor pyrolysis effluent is separated so as to produce an effluent of non-condensable organic compounds and a diolefin effluent. a) an acetalization step, comprising a reaction-separation section fed with said dilute diol feedstock and with a carbonyl feedstock comprising at least the carbonyl effluent resulting from the esterification step b), carried out in the presence of an acid catalyst present at a concentration of between 1 and 3 mol% relative to the diol included in said dilute diol feedstock, at a temperature of between 5°C 100°C, the molar ratio of the carbonyl compound included in said carbonyl feedstock to the diol included in said dilute diol feedstock feeding said reaction-separation section being between 1 and 10 and also comprising at least one separation section so as to produce at least one water effluent and one acetal effluent, b) an esterification step comprising a reaction-separation section fed with the acetal effluent resulting from step a) and comprising at least one separation section treating, by distillation, the effluents of said reaction-separation section and producing at least one water effluent, one carbonyl effluent, one concentrated carboxylic acid effluent and one diol diester residue, said reaction-separation section also being fed with a carboxylic acid feedstock comprising at least said concentrated carboxylic acid effluent, said reaction-separation section operating in the presence of an acid catalyst, at atmospheric pressure and at a temperature of between 20°C and 250°C, the amount of catalyst used being between 1 and 5 mol% relative to the amount of acetal introduced, the carboxylic acid/acetal molar ratio at the inlet of said reaction-separation section being between 2 and 20, c) a step of pyrolysis of said diol diester residue resulting from step b) comprising a pyrolysis reactor fed with said diol diester residue, operated at a temperature of between 500°C and 650°C so as to produce a pyrolysis effluent, said step c) also comprising at least one separation section in which said pyrolysis effluent is cooled to a temperature below 100°C so as to produce a liquid pyrolysis effluent and a vapor pyrolysis effluent, and in which said vapor pyrolysis effluent is separated so as to produce an effluent of non-condensable organic compounds and a diolefin effluent.