Sulfur dioxide removal from waste gas
A process where a gas, containing SO 2 and O 2 is brought in contact with a mixture of from 95% vol. to 50% vol. of activated carbon catalyst and from 5% vol. to 50% vol. of an inert filler material, where the SO 2 is converted to H 2 SO 4 on the activated carbon catalyst and is then washed from the activated carbon catalyst to obtain a H 2 SO 4 solution.
1. A process, comprising:
bringing a gas, containing SO 2 and O 2 , in contact with a mixture of from 95% vol. to 50% vol. of activated carbon catalyst and from 5% vol. to 50% vol. of an inert filler material;
wherein the mixture is a mixture of separate, distinct particles of filler and separate, distinct particles of activated carbon catalyst; and
wherein the SO 2 is converted to H 2 SO 4 on the activated carbon catalyst and is then washed from the activated carbon catalyst to obtain a H 2 SO 4 solution.
2. The process as claimed in claim 1 , wherein the filler material is between 10% vol. and 30% vol. of the mixture of activated carbon catalyst and a filler material.
3. The process as claimed in claim 1 , wherein the mixture contains no other solid ingredients than the activated carbon catalyst and the filler material.
4. The process as claimed in claim 1 , wherein the activated carbon catalyst is chosen from impregnated or activated carbon catalysts.
5. The process as claimed in claim 1 , wherein the filler is chosen from fillers made of ceramic material, made of metal, fillers made of plastic mineral or mixtures thereof.
6. The process as claimed in claim 1 , wherein the filler material is a shape comprising saddle shaped, ring shaped, ball shaped, torus shaped, prism shaped or irregular shaped.
7. The process as claimed in claim 1 , wherein the mixture is in a fixed bed.
8. The process as claimed in claim 1 , wherein the mixture is washed with water or an aqueous solution in an amount between 5 l/hour/m 3 of catalyst and 100 l/hour/m 3 of mixture.
9. The process as claimed in claim 1 , wherein the mixture is washed by intermittent spraying with water or an aqueous solution in counterflow to the gas.
10. The process as claimed in claim 1 , wherein the process is operated at a pressure from 0.9 to 1.1 atm.
11. The process as claimed in claim 1 , wherein the water saturated gas containing SO 2 and O 2 is a waste gas generated by chemical and metallurgical processes.
12. The process as claimed in claim 1 wherein the SO 2 content of the gas is between 300 ppm and 200,000 ppm.
13. The process as claimed in claim 1 , the gas being brought into contact with the mixture has a temperature of between 10 and 150° C.
14. The process as claimed in claim 1 , wherein the O 2 content of the gas is between 2 and 21% vol.
15. The process as claimed in claim 1 , wherein the H 2 SO 4 content of the H 2 SO 4 solution is between 5 and 50% vol.
16. The process as claimed in claim 1 , wherein heavy metals are removed from the gas.
17. The process as claimed in claim 1 , wherein organic contaminants are removed from the gas.