Mathematical modeling of caffeine kinetic during solid-liquid extraction of coffee beans

摘要: Abstract Rigorous and simplified models were proposed for caffeine kinetic description during the solid–liquid extraction process of coffee decaffeination. The evolution concentration was measured both in extract refined phases by gas chromatograph. rigorous model is a non-steady diffusion equation beans couple with macroscopic mass transfer solvent. one analytical solution equations In models, rectangular coordinates assumed. Caffeine internal diffusivity estimated fitting to experimental results. yields 3.209 × 10−10 m2 s−1 at 90 °C. reproduce adequately phases.