  In this study, the Van't Hoff differential equation is taken under
consideration by making use of fractional derivative tools. In this context,
the nonlinear Arrhenius behaviour can be obtained and some experimental values
of reaction rate as function of temperature were fitted, with the proposed
model. The new model showed better performance to fit rate constant data for
different kinetics process, when compared with Arrhenius law. In these case,
the Van't Hoff differential equation with noniteger order found relative
percentage error less that 3% within experimental error. The fractional order
plays an important role in modeling temperature dependence of these kinetic
processes. Thus it provides a new perspective in the handling of many problems
(e.g., as solubility as function of temperature; temperature dependency of the
viscosity and conductivity, etc).
