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AssigneeJohnsonDiversey, Inc.
InventorsLyle Steimel, James Emerson
Estimating the term…
Forward osmosis is utilized to dispense chemicals into a process water system such as a cooling tower, chilled water system, boiler, or pulp and paper plant. The dispenser includes a flexible pouch filled with treatment chemicals and an osmotic membrane. The dispenser is placed in the process water system. Water passing through the membrane increases internal pressure, which forces chemical into the process water system. The exposed surface area of the osmotic membrane can be altered to control dispensing rate. The apparatus can either utilize the chemical treatment agent as the osmotic agent, or can be divided into two separate areas utilizing a separate osmotic agent such as sodium chloride. The dispenser can be positioned in the process water system at a location where water flows onto the osmotic membrane only when the process water system is in operation.
A method of controlled dispensing treatment chemicals into a process water system comprising
A method of dispensing a chemical into a process water system wherein said chemical is held in an osmotically controlled container having an osmotic membrane adapted to transfer water into said container forcing said chemical from said container wherein said container is placed in a process water system and said osmotic membrane is contacted with water only while said process water system is in operation.
A chemical dispenser comprising a liquid chemical housed in an inner compressible container, said first container having a dispensing valve;
A chemical dispenser comprising a container incorporating a treatment chemical, an osmotic membrane on a surface of said container adapted to permit water to pass through from an exterior portion of said container to said interior portion of said container to force treatment chemical from said interior portion, said osmotic membrane covered with a plurality of covers each cover covering a portion of said osmotic membrane whereby removing a selected number of said plurality of covers exposes a selected portion of said osmotic membrane.
Dependencies are inferred from the claim text.