porous solid was dried in a pan $[2$ in $*2$ in$]$ and $0\mathrm{.}5$ in depth. The drying from critical moisture content of $0\mathrm{.}5$ kg$/$ kg dry solid to $0\mathrm{.}15$ kg $/$ kg D$.$S required Sh$.$ All the drying was in the falling rate period and are considered to be approximated by a straight line. The equilibrium moisture content is $0\mathrm{.}1$ kg$/$kg D$.$S when it contact with air feed to the dryer at $750$ and $400$ lb $/$hr$.$ft flowrate.It is proposed to dry the product from initial moisture content of $0\mathrm{.}45$ kg$/$kg of dry solid to $0\mathrm{.}2$ kg$/$kg of dry solid.