“…If x is a vector of n continuous indexes, the CDF of the system is denoted by f (x) and the molar concentration of species with indexes in the region (x 1 , x 1 + dx 1 ) × (x 2 , x 2 + dx 2 ) × · · · × (x n , x n + dx n ) is given by the analogous expression f (x)d n x. Resulting material balances lead to n-dimensional integro-differential equations which solutions have been traditionally accessed by numerical methods like: discretization (Peixoto andde Medeiros, 2001, 1999a;Ramkrishna, 1997, 1996a,b;Ng, 1996, 1995), expansions and/or colocations (Peixoto and de Medeiros, 1999a;Peixoto, 1999;Cicarelli et al, 1992;Hwang et al, 1982), moment analysis techniques (Gupte and Madras, 2004;Peixoto and de Medeiros, 1999b;McCoy and Madras, 1997;Madras et al, 1997a;Wang et al, 1995), Laplace transforms Cicarelli et al, 1992),among others (Madras and McCoy, 2003;McCoy and Madras, 2002;Madras et al, 1997b;Liou et al, 1997, McCoy, 1996, 1995, 1993Wang et al, 1994;McCoy and Wang, 1993;Prasad et al, 1986, Ziff andMcGrady, 1986).…”