$5\mathrm{.}3$Draw a flow chart of the scaled$-$up process and show the flowrates of ethanol and water in the feed, distillate and reject streams.

$6.$ Its required to concentrate black liquor in vertical long tube evaporator. The liquor is fed to the evaporator at $10k\frac{g}{s}.$ The feed liquor contains $25\%$ solids. From the evaporation unit, two streams emerge. In the first stream the liquor is found to contains $42\%$ solids $($concentrate$).$ Te second stream is pure vapor $($Water$)$

$6\mathrm{.}1$ Draw and completely label the process

$6\mathrm{.}2.$ Write all the applicable equations and determine the mass flow of black liquor and vapor $($water$)$ from the bottom and top streams

$7.$ One hundred $mo\frac{l}{h}$ of butane $(C_4{H}_{10})$ and $5000mo\frac{l}{h}$ of air are fed to a combustion reactor. Calculate the percent excess air.

$8.$ Ethane is burned with $50\%$ excess air. The percentage conversion of the ethane is $90\%$; of the ethane burned, $25\%$ reacts to form $CO$ and the balance reacts to form $C{O}_2.$ Calculate the molar composition of the stack gas on a dry basis and the mole ratio of water to dry stack gas.

$9.$ You are requested as a process engineer to perform the analysis on both dry and wet basis of the product stream generated from the combustion unit of your plant. Butane $(C_4{H}_{10})$ is burnt in the combustion chamber at a rate of $250$ mole $\frac{?}{hr}$ with $150\%$ excess air. $80$mol$\%$ of the feed goes to complete combustion while $15$mol $\%$ goes to incomplete combustion and the balance remains unburnt.

$9\mathrm{.}1$ Draw and completely label the process flow diagram.

$9\mathrm{.}2$ Calculate the mass flow rate of the air stream entering the combustion chamber.

$9\mathrm{.}3$ Perform the analysis of the flue gas on both dry and wet basis.

$10.$ Write the balanced equations of the complete and incomplete combustion reactions of the following compounds.

$10\mathrm{.}1C{F}_4$

$10\mathrm{.}2,C_3{H}_8$