摘要:
The invention relates to a process for producing 1,3-butadiene from an ethanol-rich feedstock, i.e. in which the ethanol represents more than 50% of the total weight of said feedstock, comprising at least: A) a step of converting at least said ethanol-rich feedstock and the ethanol effluent resulting from the separation step B into a conversion effluent predominantly comprising 1,3-butadiene, water and ethylene, and into a hydrogen effluent, operating at a pressure between 0.1 and 1.0 MPa, at a temperature between 300°C and 500°C in the presence of at least one catalyst; B) a step of separating at least said conversion effluent resulting from A and the hydration effluent resulting from C into at least an ethanol effluent, a butadiene effluent, a water effluent and an ethylene effluent; C) an ethylene hydration step supplied at least by said ethylene effluent and/or said water effluent both resulting from the separation step B, in order to produce a hydration effluent comprising ethanol, said hydration effluent then being recycled to the separation step B.
摘要:
The invention relates to an absorbent solution comprising at least one polar solvent chosen from cyclic dialkylcarbonates and also to a process for the liquid-phase extraction of the diolefins contained in a feedstock of hydrocarbons having various degrees of saturation.
摘要:
The invention relates to a 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 esterification step b), 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, c) a step of pyrolysis of said diol diester residue resulting from step b) comprising a pyrolysis reactor fed with said diol diester residue, said step c) also comprising at least one separation section so as to produce a diolefin effluent.
摘要:
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.