Gas separation: apparatus – Solid sorbent apparatus – Plural solid sorbent beds
Patent
1993-12-01
1995-08-15
Spitzer, Robert
Gas separation: apparatus
Solid sorbent apparatus
Plural solid sorbent beds
96130, 96144, 96150, B01D 5306
Patent
active
054415594
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to rotatable devices for the separation by adsorption of at least one constituent of a gaseous mixture, of the type comprising a rotatable assembly of adsorption units each constituted by a vertical sector enclosing a mass of adsorbent extending between a vertical external collector and a vertical internal collector that are selectively connectable, during rotation of the assembly, to sequential means for supplying and withdrawing gas.
BACKGROUND OF THE INVENTION
A "PSA" ("Pressure Swing Adsorption device") of this type is described in the document EP-A-480.840 in the name of the applicant.
This document describes a device in which the gas distribution to and from the adsorption units is effected radially, the sequential supply and withdrawal means for the gas being confined to the interior of the rotatable assembly, in a voluminous arrangement which is difficult to produce and thus relatively troublesome.
SUMMARY OF THE INVENTION
The present invention has for its object to provide a PSA device of the type defined above, of simple and reliable conception, low production cost and permitting covering a wide range of uses.
To do this, according to a characteristic of the invention, the sectors are mounted on a first flat annular plate comprising a first and second series of gas passages communicating with the internal and external collectors of the respective sectors and coacting with a second flat annular plate mounted on a stationary housing defining a set of sectional chambers, the second plate having two series of openings communicating with corresponding chambers of the set of chambers and respectively distributed over the path of the first and second series of gas passages of the first plate.
According to other characteristics of the invention radially spaced openings facing respectively a passage of the first and of the second series of passages of the first plate and communicating respectively with the external collector and the internal collector of the sector; the bottom of the sector and connected to this latter by a partition separating the two openings; communicating selectively with the external and internal collectors of the sectors, respectively; mixture under pressure, and, diametrically opposed, at least one depressurization chamber, typically connectable to a vacuum pump for the devices in which the low pressure of the cycle is less than the atmospheric pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the present invention will become apparent from the following description of an embodiment, given by way of non-limiting illustration, with respect to the accompanying drawings, in which:
FIG. 1 is a schematic elevational view, partially in section, of a device according to the invention, and
FIGS. 2 and 3 are cross-sectional views on the lines II--II and III--III of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
The device which will now be described, with respect to the drawings, is more particularly adapted to a production cycle comprising a production stage with a stage at the high pressure of the cycle and supplied by a gaseous mixture according to two steps of pressure balancing or equilibriage with the production gas of the adsorber in its depressurization phase, followed by a depressurization phase under vacuum and a final step of elution under vacuum with the countercurrent introduction of production gas before repressurization in three steps, of which a final step is with countercurrent introduction of the production gas. The gaseous mixture to be separated is typically air and the gas produced is typically medium purity oxygen, the high pressure of the cycle not exceeding 1.8.times.10.sup.5 Pa and the low pressure being no lower than 0.2.times.10.sup.5 Pa.
As will be seen in the drawings, the device according to the invention comprises a plurality of adsorption units each constituted by a vertical prismatic sector 1 with trapezoidal cross section forming a casing delimited by an exter
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Petit Pierre
Poteau Michel
Scudier Jean-Marc
Vigor Xavier
l'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation de
Spitzer Robert
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