Phenomenological thermokinetic analysis of coffee husk pyrolysis: a study case

The thermokinetic analysis of the pyrolytic degradation of coffee husk reveals that the degradation path of its main pseudo-components at the maximum degradation rate (dα/dt)_max responds to a simple kinetic law, f’(α) = -1. The study describes the dependency relationship between conversion, temperature, time, and the heating rate and confirms the validity of the relationship temperature–time, T(t), through the heating program. This study shows that the global process rate (dα/dt) increases as the heating rate increases and that the conversion degree is independent of the temperature and the heating program at the maximum rate (dα/dt)_max. Thus, at the maximum rate, k(T) and f(α) are mutually independent, and the kinetic parameters are independent of the conversion and temperature. This analysis opens windows of opportunity in terms of reaction rate, activation energy, conversion, and temperature to control the individual decomposition of each pseudo-component or to reach the full conversion of any lignocellulosic waste.