CALCIUM SULFITE 化学特性,用途語,生産方法
用途
保存料等、強化剤、酸化防止剤
化学的特性
CaSO3.2H2O, white precipitate, pKsp = 7.9, formed by reaction of soluble calcium salt solution and sodium sulfite solution, or by boiling calcium hydrogen sulfite solution; calcium hydrogen sulfite, Ca(HSO3)2, formed in solution by saturating calcium hydroxide or carbonate suspension with sulfurous acid.
使用
A major use of calcium sulfite in the past has been the
use of “lime” (Ca(OH)2) in “flue-gas” desulphurization
(removal of SO2 gas) at “fossil-fuel” electrical power
generating plants. Since calcium sulfite is relatively insoluble in water, it can be removed from the slurry
by filtration and converted to gypsum, CaSO4·2H2O.
The other usage of calcium sulfite or bisulfite
compounds has been in the “wood-pulping” industry.
製造方法
Calcium sulfite can be
prepared by the reaction of sodium sulfite with calcium
chloride:
CaCl2＋ Na2SO3→CaSO3＋ 2NaCl
The dihydrate, CaSO3·2H2O is formed. This salt is
white powder that is soluble in dilute sulfurous acid to
form the bisulfite. It may be dehydrated at 150°C to
form the anhydrous salt. It is used in the sulfite process
for the manufacture of wood pulp.
CALCIUM SULFITE 上流と下流の製品情報
原材料
準備製品