Ifp Energies Nouvelles

Total Research & Technology Feluy

Compagnie Generale Des Etablissements Michelin

Kirill Drobyshev

Jean-Christophe Gabelle

Vincent Coupard

Nikolai Nesterenko

Rejane Dastillung

Matthieu Rolland

Christophe Thille

The present invention relates to a process for producing butadiene from ethanol, in two reaction steps, comprising a step a) of converting ethanol into acetaldehyde and a step b) of conversion into butadiene, said step b) simultaneously implementing a reaction step and a regeneration step in (n+n/2) fixed-bed reactors, n being equal to 4 or a multiple thereof, comprising a catalyst, said regeneration step comprising four successive regeneration phases, said step b) also implementing three regeneration loops.

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

The present invention relates to a process for producing butadiene from ethanol, in two reaction steps, comprising a step a) of converting ethanol into acetaldehyde and a step b) of conversion into butadiene, said step b) simultaneously implementing a reaction step and a regeneration step in (n+n/2) fixed-bed reactors, n being equal to 2 or a multiple thereof, comprising a catalyst, said regeneration step comprising four successive regeneration phases, said step b) also implementing a regeneration loop for the inert gas and at least one regeneration loop for the gas streams comprising oxygen.

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

A process for dehydrating an ethanol feedstock to give ethylene, includes: a) a vaporization stage; b) a heating stage; c) a dehydration stage in a multitubular reactor comprising tubes having a length of between 2 and 4 m, said tubes comprising a, preferably zeolitic, dehydration catalyst, the feedstock having an inlet temperature of greater than 400&#xb0; C. and less than 550&#xb0; C. and an inlet pressure of between 0.8 and 1.8 MPa, the heat transfer fluid having an inlet temperature of greater than 430&#xb0; C. and less than 550&#xb0; C. and a mass flow rate such that the ratio of the mass flow rates of the heat transfer fluid relative to the feedstock is greater than or equal to 10; d) separation into an effluent comprising ethylene and an aqueous effluent; e) purification of the aqueous effluent and separation of a stream of purified water and a stream of unconverted ethanol.

Low-energy consumption method for dehydrating ethanol into ethylene

The present invention relates to a process for treating, by reactive distillation, an olefinic feedstock comprising linear olefins containing n carbon atoms, and branched olefins, the branched olefins comprising tertiary branched olefins, for example a mixture of n-butenes and of tertiary branched olefins comprising isobutene, so as to produce an olefinic effluent with a mass content of tertiary branched olefin of less than or equal to 3% by weight and a heavy hydrocarbon effluent, said process comprising the feeding of a reactive distillation section with said olefinic feedstock and with an alcohol feedstock comprising a primary alcohol, said reactive distillation section comprising a column composed at least of an upper reflux zone into which is introduced said alcohol feedstock, comprising, for example, ethanol, an intermediate reaction zone comprising at least 6 reactive doublets, and a lower fractionation zone at the level of which said section is fed with said olefinic feedstock, said reactive distillation section being operated at a relative pressure of between 0.3 and 0.5 MPa, a column head temperature of between 40&#xb0; C. and 60&#xb0; C., with a reflux ratio of between 1.8 and 2.2.

Method for separating non-linear olefins from an olefin feed by reactive distillation

This invention relates to a method for dehydration of alcohols into olefins comprising an improved step for recovery of unreacted alcohol.

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Rueil-Malmaison, France

Kirill Drobyshev