Contact and adsorbent granules
View Patent ↗The present invention relates to a unit suitable for the through-flow of a fluid medium at least partially filled with an adsorbent/catalyst in pellet form consisting essentially of iron oxide and/or iron oxyhydroxides, solidified with oxides and/or (oxy)hydroxides of the elements Al, Mg and Ti, the pellets or granules based on iron oxides and/or iron oxyhydroxides and iron(III) hydroxide for the absorbent/catalyst, and processes for their production and their use.
1. An adsorption media/reaction media granule consisting essentially of:
α-FeOOH solidified with oxides and/or (oxy)hydroxides of the elements Al, Mg and/or Ti,
wherein said granule has a mechanical and hydraulic abrasion resistance of <12%, and
further wherein said granule is formed via a precipitation of a metal hydroxide or a metal carbonate from its corresponding iron salt solution under alkaline conditions with the use of an alkaline precipitant.
2. The adsorption media/reaction media granule according to claim 1 , wherein said granule has a BET surface area of 50 to 500 m 2 /g.
3. The adsorption media/reaction media granule according to claim 1 , wherein said granule has a BET surface area of 80 to 200 m 2 /g.
4. The adsorption media/reaction media granule according to claim 1 , wherein said granule has an arsenic (V) adsorption of >51.7%.
5. The adsorption media/reaction media granule according to claim 1 , wherein said granule has an arsenic (III) adsorption of >46.2%.
6. The adsorption media/reaction media granule according to claim 1 , wherein said alkaline precipitant is sodium hydroxide.
7. The adsorption media/reaction media granule according to claim 1 , wherein said granule has a size of from 0.2 to 2 mm.
8. The adsorption media/reaction media granule according to claim 1 , wherein said granule has a residual moisture of <50%.
9. A process for removing impurities from a gas, comprising:
providing a gas containing one or more impurities, and
contacting the gas with the adsorption media/reaction media granule according to claim 1 .
10. A process for removing impurities from a liquid, comprising:
providing a liquid containing one or more impurities, and
contacting the liquid with the adsorption media/reaction media granule according to claim 1 .
11. The process according to claim 10 , wherein the liquid is water.
12. The process according to claim 11 , wherein the one or more impurities are chosen from liquid metals, phosphorus, antimony, beryllium, selenium, tellurium, cadmium, chromium and cyano compounds.
13. The process according to claim 12 , wherein the one or more impurities includes arsenic.