in neat (no solvent) CaSO3:PCl5 = 1:2; heating in tube;;

in water treatment of CaSO3 (from Ca-cyanamide in aq. soln. with SO2) with NaCl;;

in water byproducts: CaSO4; regeneration of sulfite cellulose wastes: addn. of CaO and H2SO4 (formation of CaSO3 and SO2), filtration, addn. of CaSO4, oxidizing combustion, dissolving of the melt in H2O, filtration of CaSO4,, react. of generated Na2SO4 with CaSO3 from the process;;

sulfuric acid; water; sodium sulfate in water byproducts: H2O, CaSO3; reaction of a soln. of CaSO3 containing Na2SO4 and H2SO4 forming NaHSO3, Na2SO4, CaSO4; reaction of NaHSO3 with Na2SO4 and Ca(OH)2 forming Na2SO3, CaSO3, Na2SO4, H2O; reaction of Na2SO3 with CaSO3, Na2SO4, H2O, Ca(OH)2 forming NaOH, CaSO3, Na2SO4, H2O;; filtration and reprocessing of CaSO3; precipitation of Na2SO4 by evaporation; reprocessing NaOH;;

in neat (no solvent) byproducts: calcium phosphate; 120 - 150°C, sealed tube;; distillation;;

in neat (no solvent) 120 - 150°C, sealed tube;;

in neat (no solvent) CaSO3:PCl5 = 1:2; heating in tube;;

in neat (no solvent) byproducts: phosphate; heating with CaSO3 in a sealing tube at 150 °C;;

in not given at 120 - 130°C;;

in not given at 120 - 130°C;;