Adsorbent medium
AssigneeSepragen Corporation
InventorsAlan Sanderson, Rod Dove, Fang Ming, John Howell
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Abstract
A cross-linked flexible sponge absorbent medium containing substantially uniformly distributed fibrous reinforcement is prepared under such conditions that swelling of the sponge is controlled to a water retention value of 2 to 6; and simultaneously or subsequently, the cross-linked sponge is reacted with a reagent which introduces functional groups into the modified cross-linked sponge. There is also provided apparatus having an inlet for liquid, an outlet for liquid so as to define a path for liquid flow between the inlet and the outlet, an adsorbent medium, obtainable by the above method, being positioned across the liquid flow path in the apparatus.
Claims10
A method of preparing a controlled pore size, cross-linked, flexible, sponge adsorbent medium comprising the steps of:
- a) mixing cellulose, sodium hydroxide and water;
- b) preparing viscose from the mixture in step a);
- c) adding sodium sulfate and calcium carbonate particles and cotton linters to the mixture in step b);
- d) contacting the mixture in step c) with a cross-linking agent to form cross-linked cellulose;
- e) contacting the solution in step d) further with alkali to solubilize non cross-linked cellulose;
- and
- f) regenerating the cross-linked cellulose in step e) in sodium sulfate solution.
Dependencies are inferred from the claim text.