goal of reacting substantially all of the chloride with the sorbent carbonate it is desired to use at least one but preferably two and up to three or four or even more locations for the injection of the powder carbonate in the form of sodium carbonate or sodium bicarbonate the specific location of an injection of the sorbent should take into consideration that sintering lessening the effectiveness of the sorbent takes place at a temperature well below its melting point it is preferable to inject the sorbent at the temperature sufficiently low to avoid sintering more specifically the sorbent should be injected in at least one location in the flue gas at the lowest possible temperature so that the reaction time is sufficient to permit the sorbent adequately to absorb the chlorides but also above the temperature at which dioxin is formed preferably the temperature range is about 1000 u00b0 f to 1200 u00b0 f low enough to react with so 2 at about 1100 u00b0 f to produce sodium sulfate and sulfite and also assure reaction with chlorides additional points of injection may be for example at flue temperatures of 1500 u00b0 f 1300 u00b0 f 900 u00b0 f and 700 u00b0 f i e between 1564 u00b0 f and 518 u00b0 f the efficiency of the reaction also increases at the lower temperatures a slurry is also feasible for sodium carbonate injection although powder form appears to be best suited for injection into the flue gas as these particles emerge from the cooler flue gas area they are collected and removed as in.