Gas separation: processes – With control responsive to sensed condition – Concentration sensed
Patent
1994-11-28
1996-04-16
Spitzer, Robert
Gas separation: processes
With control responsive to sensed condition
Concentration sensed
95 22, 95 23, 95 45, 95 54, 96 7, 96 13, B01D 5322, B01D 7162
Patent
active
055078559
ABSTRACT:
A process for supplying a flow of nitrogen to a site having flowrate requirements varying between a nominal flowrate and a range situated thereabove comprising: a) passing compressed air into a main line in a separating assembly formed by at least two membrane separation lines mounted in parallel, wherein at least one of the separation lines can be shut off from the main line, the separating assembly having one of the following configurations: a1) when the flowrate requirements are situated at a level of the nominal flowrate, all of the membrane separators of the assembly are in operation, none of the separating lines being shut off; a2) when the flowrate requirements of the site exceed a predetermined flowrate, at least one of the lines of the separating assembly is shut off, keeping at least one separation line and its membrane separator in operation; b) advancing nitrogen gas obtained at the outlet side of each of the membrane separators to a collector connected downstream of the main line; c) evacuating gas obtained at the permeate side of each of the membrane separators in operation in stage 2), enriched with oxygen; and d) directing nitrogen gas delivered by the collector towards at least one user station via a control device for controlling flowrate delivered by the collector, increasing or reducing this flowrate if necessary.
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L'Air Liquide Societe Anonyme pour L'Etude et L'Exploitation des
Spitzer Robert
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