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[ 5 0 ] Methyl chloride ( C H 3 C l ) and H C l are the products of a reaction between methane

[50] Methyl chloride (CH3Cl) and HCl are the products of a reaction between methane (CH4) and chlorine (Cl2). In an undesirable reaetion, the methyl chloride reacts with chlorine to form methylene chloride (CH2Cl2) and HCl. The reactor feed is a gas mixture containing 80 moles methane and 20 moles chlorine. All the chlorine is consumed in the reactor. In the product stream of the reactor, which is a gas mixture, the mole ratio of methyl chloride to methylene chloride is 5:1.
The reactor product flows into a condenser where all the methyl chloride and methylene chloride are condensed into a liquid, which is sent into a distillation column and separated into pure components. The gas mixture from the condenser is sent into a gas separation unit where CH4 and HCL are completely separated. The methane is recycled back to the reactor to join the fresh feed and the HCl is let out of the process. The schematics of the individual process units are shown below.
Figure 1: Individual unit operations
(a)[15] Write down the two balanced chemical reactions then draw and label the flowsheet of the fully connected process with a basis of 100mol of reactor feed (80(mol)CH4+20(mol)Cl2).
(b)[10] Perform degree of freedom analysis on reactor and overall process to show that the molar flow rates of all components in every stream can be calculated.
(c)[15] Write down the equations and specifications for (a) reactor alone and (b) overall process.
(d)[10] Calculate the molar flow rates of methane and chlorine in the fresh feed.
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