To evaluate linseed oil as a material for producing novel oxygen-scavenging nanoparticles, a six-step closed-loop reaction process was numerically implemented looking to simulate the oxidative behavior of the oil. Reaction rate constants were successfully determined based on observed mass increase during oxidative thermogravimetric analysis (TGA) experiments. This reactive mechanism was integrated into a novel diffusion-reaction model to accurately predict nanocapsules' absorption; the model was experimentally validated. Results showed a 13.89 mL/g oxygen uptake capacity and 0.604 mL/g per day absorption rate for the capsules at 20 °C. A parametric analysis revealed a significant temperature-dependent behavior, with an absorption rate reaching 16.6 mL/g day at 60 °C (27 times higher than at 20 °C). The model indicated that the time to absorb all the headspace oxygen remained constant, irrespective of initial capsules´ concentration: 1.2 g absorbed all oxygen in a 100 mL volume after 40 days (at initial concentrations ranging from 21% to 5%), making this technology suitable for reduced oxygen atmospheres.