Draw a balck box diagram for this. Optimizing the composition of the catalyst for phthalic anhydride production, it is possible essentially to

eliminate the production of maleic anhydride in fluidized be operations of the Sherwin$-$Williams Badger

type. In this type of process, naphthalene $(C_{10}{H}_8)$ is either converted to phthalic anhydride $(C_8{H}_4{O}_3)$ or

consumed by complete combustion. During a test of such a process, a sample is taken of the waste gas

leaving the switch condensers. Its analysis on a dry basis is as follows:

$C_{10}{H}_8+4\mathrm{.}5O_2{C}_8{H}_4{O}_3+2C{O}_2+2H_{2}O$

$C_{10}{H}_8+12O_{2}10C{O}_2+4H_{2}O$