![]() Sulfites are strong reducers in solution, they act as oxygen scavenger antioxidants to preserve food, but labeling is required as some individuals might be hypersensitive.Ĭhemical wood pulping is the removal of cellulose from wood by dissolving the lignin that binds the cellulose together. Along with other antioxidant sulfites, it is commonly used in preserving wine, cider, fruit juice, canned fruit and vegetables. Food additive Īs a food additive it is used as a preservative under the E number E226. A typical US home contains 7 metric tons of such drywall gypsum board. The gypsum, if sufficiently pure, is marketable as a building material.Ĭalcium sulfite is generated as the intermediate in the production of gypsum, which is the main component of drywall. The resulting calcium sulfite oxidizes in air to give gypsum: Scrubbing with hydrated lime follows the following idealized reaction: SO 2 + Ca(OH) 2 → CaSO 3 + H 2O Scrubbing with limestone follows the following idealized reaction: An economical way of scrubbing SO 2 from flue gases is by treating the effluent with Ca(OH) 2 hydrated lime or CaCO 3 limestone. Sulfur dioxide is scrubbed before the remaining gases are emitted through the chimney stack. Flue gas often contains SO 2, whose emission is often regulated to prevent acid rain. ![]() When coal or other fossil fuel is burned, the byproduct is known as flue gas. ![]() It is produced on a large scale by flue gas desulfurization (FGD). ![]()
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