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Method for separating air by means of cryogenic distillation

a technology of air distillation and separation method, which is applied in the direction of cold treatment separation, liquefaction, solidification, etc., can solve the problems of extra cost and compression apparatus, and achieve the effect of avoiding the oversizing of compressors

Inactive Publication Date: 2014-01-16
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention aims to prevent the compressors from becoming too big by reducing the airflow that needs to be compressed. This helps to provide the extra gas needed to pressurize the adsorbent bottles.

Problems solved by technology

However, this additional air flow implies oversizing, and therefore an extra cost, of the compression apparatus.

Method used

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  • Method for separating air by means of cryogenic distillation
  • Method for separating air by means of cryogenic distillation
  • Method for separating air by means of cryogenic distillation

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Embodiment Construction

[0028]The invention shall be better understood when reading the following description, provided solely by way of example and in reference to the annexed drawing, wherein:[0029]FIG. 1 is a diagrammatical view of an installation for operating the method according to the invention.

[0030]FIG. 1 shows an installation 1 for the distillation of air according to the invention. This installation is for example intended to produce gaseous oxygen OG, as well as liquid oxygen OL.

[0031]The installation 1 substantially comprises:[0032]an air compressor 4;[0033]an apparatus 6 for purifying air via adsorption, said apparatus comprises, on the one hand, two adsorbers 7A, 7B in the form of two bottles each containing adsorbent materials, for example molecular sieve possibly with alumina, capable of adsorbing the water and the carbon dioxide present in the air, and, on the other hand, ducts and connection valves of which the arrangement shall appear clearly during the description of the method impleme...

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Abstract

In an air-distillation method, purified air is cooled in an exchange line and then sent to a distillation column of a system of columns, and oxygen- and nitrogen-rich fluids are extracted from a column of the system of columns only during the repressurization phase. A purified airflow, constituting between 3% and 20% of the air compressed in the compressor, is used to at least partially pressurize the adsorber completing the regeneration phase thereof, and the airflow compressed in the compressor during the adsorption phase is substantially equal to the airflow compressed in the compressor during the pressurization of the adsorber. A portion of the purified air is sent to a turbine where it is decompressed and then sent into the atmosphere an as to ensure that it is kept at least partially cold during the entire cycle, and the amount of decompressed airflow sent into the air during the pressurization of an adsorber is less than the amount sent into the air during the adsorption phase of the same adsorber.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a §371 of International PCT Application PCT / FR2012 / 050587, filed Mar. 21, 2012, which claims the benefit of FR 1152733, filed Mar. 31, 2011, both of which are herein incorporated by reference in their entireties.TECHNICAL FIELD OF THE INVENTION[0002]This invention relates to a method for separating air by distillation of air, in particular intended for producing oxygen and / or nitrogen and / or argon, of the type wherein the air to be distilled is purified beforehand by means of at least two adsorbers which each follow, offset, a cycle wherein succeed an adsorption phase, at a pressure of the cycle, and a regeneration phase ending with a pressurisation of the adsorber.BACKGROUND[0003]The pressures of which it is question here are absolute pressures.[0004]In this type of installation, the distillation of the air, compressed beforehand by a compression apparatus, is carried out cryogenic temperatures and therefore requires ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/04
CPCF25J3/04F25J3/04054F25J3/0409F25J3/04175F25J3/04181F25J3/0429F25J3/04296F25J3/04393F25J3/04412F25J3/04478F25J2205/72F25J2215/40
Inventor LE BOT, PATRICK
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE