This study investigates the effects of organic acid on the simultaneous absorption of SO₂ and NO₂ in the packed column. Organic acids, i.e., formic acid, acetic acid, and propionic acid, were used as additives. In the case of the absence of additives, when SO₂ and NO₂ were simultaneously absorbed into the limestone slurry, both SO₂ and NO₂ contributed to increasing the mutual absorption efficiency. In the simultaneous absorption of SO₂ and NO₂ with addition of additives, the SO₂ removal efficiency appeared in the order of formic acid<no addition<propionic acid<acetic acid. Acetic acid has a superior buffer capacity and intermediate hydrophobic interaction, resulting in the highest SO₂ absorption efficiency. In the slurry with the addition of acetic acid and propionic acid, the reactions of absorbed SO₂ and NO₂ predominantly took place; thus, the SO ²⁻₄ /SO ²⁻₃ ratio was greater than 1. In terms of formic acid, the slurry pH was maintained at approximately 4.0, which departs from the appropriate range, attributed to the small pKa value, showing a negative effect on SO₂ and NO₂ removal. In the slurry with formic acid added, the SO₂ predominantly reacted with formic acid; hence, the SO ²⁻₄ /SO ²⁻₃ ratio was less than 1.

本研究调查了有机酸对填充柱中同时吸收 SO ₂和 NO ₂的影响。有机酸，即甲酸、乙酸和丙酸，用作添加剂。在没有添加剂的情况下，当SO ₂和NO ₂同时被吸收到石灰石浆中时，SO ₂和NO _{2 都}有助于提高相互吸收效率。在添加添加剂的情况下同时吸收 SO ₂和 NO ₂时，SO ₂去除效率依次为甲酸<不添加<丙酸<乙酸。乙酸具有优越的缓冲能力和中等疏水相互作用，从而产生最高的 SO ₂吸收效率。在加入乙酸和丙酸的浆液中，吸收的SO ₂和NO ₂反应主要发生；因此，SO ^2- ₄ /SO ^2- ₃比值大于1。 就甲酸而言，浆液pH值维持在4.0左右，偏离适当范围，归因于pKa值较小，显示为负值对 SO ₂和 NO _{2 的影响} 移动。在加入甲酸的浆液中，SO ₂主要与甲酸反应；因此，SO ^2- ₄ /SO ^2- ₃比值小于 1。