L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

L'air Liquide,societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude

Lucien Greter

Francois Venet

Jean-Pierre Gourbier

Francedillaois Venet

A cryogenic distillation apparatus comprising a system of columns (,) also includes at least one external source of a gas other than a column of the system and means for sending this pressurized gas to the first pump (,) in order to serve as barrier gas for a pump (,) and/or at least one external source (,) of liquid other than a column of the system and means for vaporizing at least one portion of this liquid and for sending the vapour thus formed to the first pump in order to serve as barrier gas and/or means (,) for withdrawing a liquid from a column of the system and for vaporizing at least one portion thereof downstream of the first or of the second pump in order to deliver a barrier gas (,) for the first pump.

Process and plant for separating a gaseous mixture by cryogenic distillation

A cryogenic air separation process and apparatus in a distillation column having a top condenser. Air is compressed, purified and cooled to a temperature suitable for distillation. The air is separated in a distillation column so that an oxygen-enriched liquid and a nitrogen-enriched gas are produced within the column. A stream of cryogenic liquid is sent to the column and an oxygen-enriched liquid is sent from the column to the condenser. The flow rate of cryogenic liquid is regulated as a function of the level of oxygen-enriched liquid at the bottom of the column, and a product stream is withdrawn from the column.

Cryogenic air separation process and apparatus

The invention aims at preventing the risks of deformation and breaking down of the heat exchanger which is part of a plant for the batch treatment of fluids, of the type in which, during active periods which are separated from one another by rest periods, at least one refrigerating fluid is allowed to circulate in first ducts of the exchanger, from the cold end to the hot end of the latter, and at least one calorigenic fluid is circulated in second ducts of the exchanger, from the hot end to the cold end of the latter, characterized in that, during rest periods, heat is introduced at the hot end and cold is introduced at the cold end of the exchanger so as to maintain these two ends at temperatures which are relatively close to those corresponding to the active periods, at least one of these two inputs being supplied by means of a reserve fluid of the plant.

Process for operating a heat exchanger

The article of which the verticality is critical, for example a distillation column disposed in a closed envelope, is associated with an indicator of verticality comprising a suspended mass and a locating ring. The envelope, which contains the various inner articles, is placed on a base by means of supports and its inclination with respect to the base is adjusted by controlling the relative position of the mass with respect to the ring. Application for example to cold boxes for the in situ production of gas from air.

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Le Plessis Trevise, France

Lucien Greter