Other

Edr Acquisition Corp.

George L Dimotsis

Gerhard K Kunz

Richard L Sampson

Wolfgang Podszun

Reinhold M Klipper

Allison H Sampson

Chlorine dioxide solutions are stabilized and prepared for storage, transportation, and testing. Each solution is separated into two samples. Chlorine dioxide is removed from one sample and then each sample is stabilized and prepared such that each sample contains only oxidized and/or reduced forms of chlorine dioxide. The stable samples may be stored, transported, and tested for chlorine dioxide. The samples are tested for the oxidized and/or reduced forms of chlorine dioxide by known methods, and mass balance equations are used to determine the concentration of chlorine dioxide in the original sample before stabilization and preparation.

Method of preparing, storing, transporting and testing chlorine dioxide solutions

The invention relates to a process for preparing gel-type cation exchangers of high stability by sulfonation of crosslinked (meth)acrylic ester-containing bead polymers with sulfuric acid having a concentration of 90 to 95% in the absence of a swelling agent.

Process for preparing gel-type cation exchangers

A method of regenerating an ion exchanger which is used to treat a solution introduced to the ion exchanger in a downward charging direction. The ion exchanger comprises a non-constrained bed of ion exchange material in the form of ion exchange granules and has a concentration profile through the ion exchange material after the solution has been introduced to the ion exchanger in the charging direction. The method in one embodiment comprises passing a regenerating solution upwardly through the non-constrained bed of ion exchange material in an intermittent pulsed flow comprising a pulse or up flow of regenerating solution, a subsequent non-flow pause time, followed by a down flow pulse in a direction opposite to the up flow. The duration and velocity of the pulse or up flow of regenerating solution is sufficient to hydrodynamically lift the ion exchange granules a controlled distance through all of the ion exchange granules without causing significant mixing of ion exchange granules between different layers of the ion exchange material. The duration of the subsequent non-flow pause time being of short duration to allow for some perceptible settling of the ion exchange granules, with the down flow pulse being sufficient to reduce the sedimentation time of the ion exchange granules to a fraction of the normal settling time for the granules in the absence of the down flow pulse.

Countercurrent regeneration process

A method of regenerating an ion exchanger which is used to treat a solution introduced to the ion exchanger in a downward changing direction. The ion exchanger contains a non-constrained bed of ion exchange material in the form of ion exchange granules and has a concentration profile through the ion exchange material after solution has been introduced to the ion exchanger in the charging direction. The method of regenerating comprises passing a regenerating solution upwardly through the non-constrained bed of ion exchange material in an intermittent flow manner comprising an alternating up flow of regenerating solution followed by a down flow of liquid in a direction opposite to the up flow. The duration and velocity of the up flow of regenerating solution is sufficient to lift and generate a perceptible mixing of ion exchange materials in approximately the bottom portion of the ion exchange bed, with the down flow being sufficient to seat the bed very rapidly and terminate mixing.

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Lansdale, PA, United States of America

George L Dimotsis