Process for dehydrating alcohols to give olefins with energy optimization

Abstract

The present invention relates to a process for dehydrating an alcohol feedstock, comprising: a) vaporizing said alcohol feedstock in a mixture with a gaseous stream, b) introducing said alcohol feedstock, which is vaporized and in a mixture with said gaseous stream, into a set of at least two adiabatic reactors, c) separating the effluent resulting from the last adiabatic reactor of step b) into an effluent comprising the olefin(s) corresponding to the dehydration of the feedstock and an aqueous effluent, d) compressing the effluent comprising the olefin(s) and resulting from step c), in at least one compressor, e) dividing the compressed effluent resulting from step d) into two fractions, and then f) recycling, in part or in full, a first fraction of the compressed effluent upstream of step a) in order to constitute said gaseous stream.

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