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A Continuous-Flow Stirred Reaction Cell For Studying Adsorption In Suspensions

Dep. of Agronomy, Univ. of Arkansas, Fayetteville, AR 72701

W. P. Miller and M. E. Sumner

Agronomy Dep., Univ. of Georgia, Athens, GA 30602

*Corresponding author.

ABSTRACT

Solute sorption by inorganic colloids is currently studied using either batch or miscible displacement techniques, but continuous-flow stirred reaction cells may represent a desirable alternative to these methods in certain situations. A practical limitation of current cell designs is the inadequate mixing effected by magnetic stirrers, which allows the sorbent to rapidly deposit onto the filter membrane. We have designed a continuous-flow stirred reaction cell in which the suspension is efficiently and vigorously mixed by means of a two-blade impeller powered by an electric motor. The impeller shaft is bearing-mounted and sealed with a rubber O-ring. The entire cell is water jacketed for temperature control. Joule heating appears to be insignificant at the impeller speeds required for mixing at flow rates of up to 60 mL h^–1. Runs with orthophosphate solution and no adsorbent indicate that mixing is ideal. Data reduction is illustrated using a phosphate/goethite system.

Contribution from the Georgia Agric. Exp. Stn., Athens, GA.

Received for publication August 18, 1988.

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