solving time-fractional chemical engineering equations by modified variational iteration method as fixed point iteration method

The variational iteration method (vim) was extended to find approximate solutions of fractional chemical engineering equations. the lagrange multipliers of the vim were not identified explicitly. in this paper we improve the vim by using concept of fixed point iteration method. then this method was implemented for solving system of the time fractional chemical engineering equations. the obtained approximate solutions are compared with the numerical results in the literature to show the applicability, efficiency and accuracy of the method.