Reviewing the Old to Discover the New (Series 19)
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Short answer: What methods are commonly used to regenerate desulfurization agents based on activated carbon?
Solvent regeneration and gas regeneration are commonly used for the regeneration of desulfurization agents based on activated carbon.
Generally, heating can be carried out directly using a forced-air oven at 200°C. The purpose is to desorb. In other words, it involves removing the substances that have been adsorbed by the carbon under high temperatures, thereby freeing them from the carbon’s adsorption capacity.
Activated carbon is mainly used to remove organic sulfur and small amounts of hydrogen sulfide. Based on different reaction mechanisms, they can be divided into three methods: adsorption, oxidation, and catalysis. Adsorption method: Activated carbon has a large specific surface area, strong adsorption capacity, and high selectivity; it is particularly effective at adsorbing substances with high volatility, and is most effective against thiophene. Oxidation method: Hydrogen sulfide and carbon disulfide are oxidized by the oxygen present in the gas. H2S(g) + O2 → S(s) + H2O; 2COS + O2 → CO2 + 2S. Catalytic method: Iron, copper, and other salts are impregnated into activated carbon, enabling the catalytic conversion of organic sulfur into hydrogen sulfide, which is then adsorbed and removed.
Regeneration method: Remove the deactivated desulfurizer and place it evenly and loosely on a flat, clean, shaded, and well-ventilated area, allowing the desulfurizer to come into full contact with air for oxidative regeneration. If the moisture content in the desulfurizer is low, an appropriate amount of lime water with a concentration of around 5% can be sprayed evenly to accelerate the regeneration process. When the color of the desulfurizer changes from black to iron-red or brown, the powder residue is screened out, and the regenerated desulfurizer is then placed back into the desulfurizer for further use. If, after prolonged regeneration, the color of the desulfurizer does not change to iron-red or brown, it indicates that the desulfurizer has completely lost its activity, and it is then necessary to replace it with a new one.
Activated carbon is currently widely used in environmental protection, as well as in industrial and domestic applications, and has achieved considerable results. However, once it becomes saturated and needs to be replaced, the organizations that use it discard it by burying it or burning it, which leads to waste of resources and further pollution of the environment. Activated carbon adsorption is a physical process; therefore, high-temperature steam can also be used to desorb the impurities from the used activated carbon, restoring its original activity so that it can be reused, which offers significant economic benefits. The regenerated activated carbon can still be reused and regenerated repeatedly for its intended purposes.
What methods are commonly used for regenerating desulfurization agents using activated carbon? Thermal regeneration method
What methods are commonly used for regenerating desulfurization agents using activated carbon? Answer: Thermal regeneration method