Gas dissolution under pressure
AssigneeAir Products and Chemicals, Inc.
InventorsCynthia Elizabeth Roerty, Julia Man-Lai Hara
Life of this patent
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Abstract
The present invention is directed to precise, accurate mixing two or more chemicals in a metered vessel to achieve a precise, accurate concentration of the chemicals. More particularly, the chemicals are mixed in a vessel having constricted vent tubes with level sensors to precisely and accurately determine the volume of chemical introduced into the vessel. Most specifically, the vessel is closed so that the introduction of the chemicals increases the vessel pressure to enhance the mixing of the chemicals, decrease turbulence and enhance the accuracy of the level sensors.
Claims10
A method for accurately mixing chemicals in a metered vessel comprising the steps of:
- a) providing a metered vessel having one or more inlets for chemicals to be mixed, a plurality of constricted vent tubes each having level sensing means and means to control venting of said metered vessel;
- b) introducing a first chemical into said metered vessel through said one or more inlets to provide a predetermined accurate volume of said first chemical wherein said first chemical's introduction is stopped when its level rises in a first of said plurality of constricted vent tubes to the point of said level sensing means generating a signal from said level sensing means;
- c) introducing at least a second chemical into said metered vessel through said one or more inlets to provide a predetermined accurate volume of said at least second chemical wherein said second chemical's introduction is stopped when its level rises in another of said plurality of constricted vent tubes to the point of said level sensing means generating a signal from said level sensing means;
- and
- d) simultaneous to introducing said at least second chemical into said metered vessel, maintaining said means to control venting at least partially closed at least during a portion of said introducing said at least second chemical to raise the pressure in said metered vessel.
Dependencies are inferred from the claim text.