| abstract |
Increased quantities of acidic components present in industrial waste gases (particularly nitrogen and sulphur oxides) are removed by active carbonates of alkaline metals prepared in a novel way. A suitable starting material is heated to a temperature of between 30° and 200° C. in a stream of gas from which the acidic components have been at least partially removed. The resulting active alkali metal carbonates, free of hydrates, are subsequently brought at temperatures between 100° and 200° C. into contact with the humid waste gas. A preferred apparatus for carrying out the method is also described. |