Sulfur dioxide, formed in combustion of sulfur-rich fuels in diesel engines, may oxidize and react with water to form corrosive H₂SO₄. However, the SO₂ may also be absorbed in the lube oil and consume CaCO₃-containing reverse micelles. In this study, the CaCO₃ + SO₂ reaction was investigated in a batch reactor setup at temperatures and pressures similar to those on the cylinder liner in an engine. The conversion of CaCO₃ and the formation of products were determined by Fourier Transform Infrared Spectroscopy (FTIR). CaSO₃ was the main product, but CaSO₄ was observed at extended residence times and increased temperature. The SO₂-CaCO₃ reaction exhibited only a small temperature dependence; the increase in the rate constant with temperature was partly off-set because the absorption of SO₂ in the lube oil emulsion decreases at increased temperature. The reaction rate increased slightly with the initial water concentration due to increased SO₂ absorbance. A mathematical model for the batch reactor was set up and kinetic parameters were determined by fitting predictions to the experimental data. The model was then used to predict the CaCO₃ conversion in lube oil from SO₂ for conditions relevant to a full-scale engine application. Simulations showed that consumption of CaCO₃ from SO₂ is insignificant in a two-stroke marine diesel engine application and that the H₂SO₄-CaCO₃ reaction is far more important than the SO₂-CaCO₃ reaction.

在柴油发动机中富硫燃料燃烧时形成的二氧化硫可能氧化并与水反应形成腐蚀性H ₂ SO ₄。然而，SO ₂也可以被吸收在润滑油中并消耗含CaCO ₃的反胶束。在这项研究中，在间歇式反应器中研究了CaCO ₃ + SO ₂反应，其温度和压力与发动机气缸套上的温度和压力相似。通过傅立叶变换红外光谱法（FTIR）确定CaCO ₃的转化和产物的形成。CaSO ₃是主要产品，但CaSO ₄在延长的停留时间和升高的温度下观察到。SO ₂ -CaCO ₃反应仅表现出很小的温度依赖性。速率常数随温度的增加被部分抵消，这是因为在升高的温度下润滑油乳化液中SO ₂的吸收降低。由于增加了SO _2的吸收，反应速率随初始水的浓度而略有增加。建立了间歇反应器的数学模型，并通过对实验数据进行拟合预测来确定动力学参数。然后使用该模型预测SO ₂在润滑油中的CaCO ₃转化率适用于与大型发动机应用有关的条件。模拟表明，在二冲程船用柴油机应用中，SO ₂所消耗的CaCO ₃微不足道，并且H ₂ SO ₄ -CaCO ₃反应比SO ₂ -CaCO ₃反应重要得多。