Compagnie Francaise D'etudes Et De Construction-Technip

Gerard Heck

Victor Kaiser

Joelle Mestrallet

Philippe Lepetit

The present invention relates to a method and an apparatus for producing ethylene. This apparatus comprises essentially a phase separator connected to an ethylene fractionating unit. The fractionating unit comprises a first or lower-pressure fractionating column and a second or higher-pressure fractionating column, the second column being fed with an intermediate liquid fraction from the first column and having its head connected to the heating circuit of the reboiling system associated with the first column to at least partially condense the head fraction of the second column. Thus, the invention allows high-purity ethylene to be produced with minimum energy consumption.

Method for producing purified ethylene through thermo-coupled

A method of making ethylene consisting in processing an ethylene gas condensate which is passed through a de-ethanizer to separate as gases the C.sub.2 -hydrocarbons with two carbon atoms, cooling said hydrocarbons to condensate a part thereof, feeding said hydrocarbons into a separator where the condensed phase is separated and recycled to the de-ethanizer, and feeding the non-condensed fraction of said hydrocarbons into an ethylene-recovering unit with which is associated a reboiling system for heating the fluid taken from said unit prior to recycling it to the latter, and further comprising the step of exchanging heat between the hydrocarbons from the de-ethanizer and the reflux fluid from said reboiling system so as to at least partially condensate the hydrocarbons fed to said separator.

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Louveciennes, France

Gerard Heck