L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

Nicolas Chantant

Paul Terrien

Natacha Haik

Daniel Machon Diez De Baldeon

Jean-Marc Peyron

A method for separating a mixture containing at least nitrogen and methane by cryogenic distillation in a first column operating in a first pressure and a second column operating at a second pressure lower than the first pressure, the mixture being separated in the first column to form a gas enriched in nitrogen and a liquid enriched in methane, at least a portion of the gas enriched in nitrogen being at least partially condensed in a heat exchanger and returned to the first column, the gas enriched in nitrogen is sent into the heat exchanger by the bottom, ascends in a first series of passages of the exchanger and condenses therein at least partially, the liquid formed descending in these passages of the first series and exiting by the bottom of the exchanger.

Method for separating a mixture containing at least nitrogen and methane

A process for producing biomethane by scrubbing a biogas feed stream includes introducing the feed gas stream into a pretreatment unit wherein a CO-depleted gas stream is partially separated from a COstream and an oxygen stream and is compressed to a pressure P1 above 25 bar abs. Subjecting the CO-depleted gas stream to cryogenic separation in a distillation column to separate a nitrogen stream and produce a CH-enriched stream, the distillation column comprising n plates, n being an integer between 8 and 100. Recovering a pressurized CH-enriched stream by pumping the CO-depleted gas stream to a pressure P2 above 25 bar absolute.

Method for distilling a gas stream containing oxygen

In a method for producing a series of at least a first and a second plate-fin heat exchangers, several elongate fluid distribution tanks are installed on the matrix unit, each tank capping just some of the openings assigned to the first fluid and to the second fluid, each tank having its axis in the direction of stacking and each being connected to a pipe so that the number of openings assigned to the first fluid differs from the number of openings assigned to the first fluid, and for preference, the number of openings assigned to the second fluid differs from the number of openings assigned to the second fluid for the at least first and second exchangers of the series.

Method for producing a series of at least a first and second heat exchangers

In a method for producing a series of at least a first and a second plate and fin heat exchanger, each having at least one fluid distribution tank capping at least some of the openings of the matrix unit and which is connected to a pipe, the tank is partitioned into several compartments using at least one partition, so as to distribute the number of openings assigned to a first fluid and to a second fluid, the partition being designed to divide the tank into several compartments which are each connected to a pipe for the passage of the first fluid or of the second fluid and which each communicate with a number of openings that varies according to the configuration adopted by the at least one partition, for the exchanger of the series.

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Grenoble, France

Nicolas Chantant