Technip France

Loic Barthe

Sandra Thiebault

Julie Anne Gouriou

Vanessa Gahier

Henri Paradowski

Julie Gouriou

This method comprises a separation of a feed stream () into a first fraction (A) and a second fraction (B). It comprises injecting the first cooled feed fraction () into a first separating flask () to produce a light head stream (). The method comprises expanding a turbine feed fraction () resulting from the light head stream () in a first turbine () up to a first pressure and injecting the first expanded fraction () into a distillation column (). The method comprises expanding the second fraction of the feed stream (B) in a second turbine () up to a second pressure substantially equal to the first pressure. The second expanded fraction (A) from the second dynamic expansion turbine () is used to form a cooled reflux stream (B) injected into the column ().

Method for producing a methane-rich stream and a Chydrocarbon-rich stream, and associated equipment

This method envisions cooling the supply flow in a first heat exchanger, separation in a first separation flask in order to produce a light upper flow and a heavy lower flow and dividing the light upper flow into a supply fraction of a dynamic pressure reduction turbine and a supply fraction of a first distillation column. A cooled reflux flow is formed from an effluent from a dynamic pressure reduction turbine, the portion of the effluent being cooled and at least partially liquefied in a heat exchanger. The cooled reflux flow is introduced from the heat exchanger into the first distillation column.

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This method comprises cooling the feed natural gas in a first heat exchanger and introducing the cooled, feed natural gas into a first separation flask. It comprises the dynamic expansion of a turbine supply flow in a first expansion turbine and introducing the expanded flow into a separation column. This method comprises removing, at the head of the separation column, a head flow rich in methane and removing a first recirculation flow from the compressed head flow rich in methane. The method comprises forming at least a second recirculation flow obtained from the head flow rich in methane downstream of the separation column and forming a dynamic expansion flow from the second recirculation flow.

The method according to the invention comprises the separation of a feed stream () into a first fraction () and a second fraction () and the injection of at least part of the second fraction () into a second dynamic expansion turbine () to form a second expanded fraction (). It comprises the cooling of the second expanded fraction () through heat exchange with at least part of the first headstream () coming from a first column () and the formation of a second feed stream () of the first column () from the second cooled expanded fraction.

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Paris, France

Loic Barthe