研究論文
有機酸水溶液に溶解したCaとSO2の不均一反応
キーワード:
Aerosol,
Organic Acids,
Calcium Carbonate,
Sulfur Dioxide,
Heterogeneous Reaction,
Raman Microscope
2016 年 31 巻 1 号 p. 39-46
詳細
2016 年 31 巻 1 号 p. 39-46
Abstract In order to investigate the influences of organic acids on heterogeneous reactions of SO2 with CaCO3 which is contained in mineral dust, a Raman microscope was used for tracking microscopic temporal changes in the reactions of the droplet of organic acids solution dissolving CaCO3 and gaseous SO2. Oxalic acid, malonic acid, citric acid, benzoic acid, acetic acid and propionic acid with different acidities were selected. The oxalic acid could easily combined with the calcium in solution and produce the calcium oxalate which is unsolvable. The Ca2＋ dissolved in solution of acetic and propionic acids reacted with SO2 to form CaSO4·2H2O which was gypsum. The CaCO3 solution containing malonic, citric or benzoic acids considerably enhanced the SO2 absorption because of the effect of buffered solution which consists of a mixture of a weak acid and its calcium compounds. Effects of organic acids on heterogeneous reactions of SO2 with CaCO3 were strongly dependent on the acidity of organic acids and the solubilities of produced organic calcium compounds.
