Calcium sulfite CaSO

A number of chemical reactions occur in the absorber beginning with the reaction of limestone (CaCO,) with the SO, to form calcium sulfite (CaSO,). The calcium sulfite oxidizes to calcium sul-... [Pg.446]

Forced oxidation in flue gas desulfurization (FGD) systems converts calcium sulfite (CaSO. H O) to calcium sulfate, or... [Pg.173]

In one type of electrostatic precipitation system, the SO2 produced by the burning of fossil fuels is reacted with lime (CaO) to produce solid calcium sulfite (CaSOs) ... [Pg.299]

Flue-Gas (Stack-Gas) Scrubbing. Flue-gas scrubbing is a refiner s last chance to keep NOx and SOx out of the air. In wet flue-gas desulfurization, gas streams containing SOx react with an aqueous slurry containing calcium hydroxide Ca(OH)2 and calcium carbonate CaCOs. Reaction products include calcium sulfite (CaSOs) and calcium sulfate (CaS04>, which precipitate from the solution. [Pg.61]

Once in solution, Ca reacts with to form calcium sulfite (CaSOs) by the... [Pg.329]

It combines with sulfur dioxide to form calcium sulfite hemihydrate, CaSOs MiH20 which can oxidize in air in the presence of moisture to give calcium sulfate dihydrate, CaS04 2H2O. However, when SO2 is passed through a solution of calcium hydroxide, calcium bisulfite, Ca(HS03)2 is obtained. The solution is yellowish when it contains bisulfite in aqueous SO2. [Pg.168]

The solid product from each of these sets of reactions is primarily calcium sulfite hemihydrate (CaSOs-5 H2O), which has been confirmed by x-ray diffraction analysis of scrubber sludgesJ l A similar set of reactions collects sulfur trioxide (SO3) from the flue gases, forming gypsum (CaS04 2H2O) as the solid product, but under normal boiler conditions sulfur trioxide makes up only about 0.5% of the total sulfur oxides, and so its removal is less important than the removal of sulfur dioxide.l " ... [Pg.2705]

Barium iodate Ba(IO,), 4,01 10- Calcium sulfite hemihydrate CaSO, 0,5HjO 3.1 10- ... [Pg.1322]

Because of the marked difl[erence in the water solubility of CaS04 and CaSOs (0.2016 g/100 ml and 0.0045 g/100 ml), the latter is formed by treatment of the sulfate with alkali sulfite. However, this conversion is not directly observable, but if a solution of sodium selenosulfate is used as a SOs donor, the slow deposition of red elemental selenium indicates the formation of calcium sulfite ... [Pg.164]

CaSOs Calcium sulfite Preservative in cider and fruit juices... [Pg.185]

Calcium sulfite dihydrate CaSO, 2H,0 10267-66-3 166.173 wh powder 0.0070 si FtOH s acid... [Pg.684]

Lime slurry and limestone scrubbing are suitable for relatively low SO2 concentrations and moderate SO2 removal efficiencies ( 95%). Each process generates calcium sulfite solid waste that can be placed in a nonhazardous landfill. The waste solids are actually a mixture of mostly calcium sulfite with a small amount of calcium sulfate. The mixture is often represented as CaSO solids. [Pg.330]

Sulfates and Sulfites. Calcium sulfate [7778-18-9] occurs in large deposits as CaSO and as gypsum, CaSO -2H20. The dihydrate is a... [Pg.407]

Sulfite is removed by precipitate flotation with sodium dodecylbenzenesulfonate at an optimum pH of 8.6. Removal was 93% for precipitate (CaSOs) sulfite and 85% for total sulfite. The simultaneous removal of sulfite and carbonate was studied using precipitate flotation as the calcium salts. Removal wras 95% of precipitated sulfite and 97% of the carbonate. [Pg.531]

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