In this section, we investigate the major liquid+solid reactions that contribute to film growth in the presence of air-saturated dissolved oxygen. We analyze one-dimensional film growth simulation snapshots over a one-year period. Our goal is to gain insights into the impact of oxygen on film growth and explore potential strategies to mitigate fouling in the debutanizer system. Fig. shows the rate of film growth through important reactions at selected trays at the initial time and 1 year. The dominating film growth chemistry changes over time. With the higher concentration of dissolved oxygen in the colder section of the debutanizer, the film growth is initially dominated by oxygen-driven fast-growth pathways.