(19)
(11) EP 0 152 201 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.08.1987 Bulletin 1987/32

(43) Date of publication A2:
21.08.1985 Bulletin 1985/34

(21) Application number: 85300488

(22) Date of filing: 24.01.1985
(84) Designated Contracting States:
BE DE FR IT NL

(30) Priority: 24.01.1984 GB 8401781

(71) Applicant: The BOC Group plc
 ()

(72) Inventor:
  • Garrett, Michael Ernest
     ()

   


(54) Dissolving gas in liquid


(57) In order to dissolve a gas such as oxygen in a liquid, typically aqueous, a stream of liquid is taken from tank 2 by a pump 10 and pressurised thereby. Oxygen is introduced into the stream via a conduit 18 upstream of a venturi 20. Turbulence created as the stream passes through the venturi 20 helps to disperse the oxygen as fine bubbles in the stream. The dispersion is then conducted to a sparge pipe 14 and introduced into the main volume 4 of liquid in the tank 2. The bubbles are thereby sheared into very small bubbles that readily dissolve in or are consumed by the volume 4 of liquid. Some of the gas in the dispersion is separated therefrom at a relatively downstream position and drawn along a pipe 26 back into the stream at a relatively upstream position by the action of the stream passing through the venturi 20. A valve 28 is operable to regulate the rate at which gas is so recycled.







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