Direct dehydrogenation of ethylbenzene to styrene is carried out in the vapor phase with steam. overa catalyst consisting primarily of iron oxide. The reaction is endothermic, and can be accomplished either adiabatically or isothermally. Both methods are used in practice. The major reaction is the reversible, endothermic conversion of ethylbenzene to styrene and hydrogen: C.HSCH:CH) C.HSCHCH:+Ha AH - 124.9 kJ/mol Competing thermal reactions degrade ethylbenzene to benzene CH CHCH 4 CH4 + C3H. AH-101.8 kJ/mol Styrene also reacts catalytically to toluene: C.HSCH:CH3 + H2 C.HSCH+CH. AH - 64.5 kJ/mol The reactions take place at 620C. The costs are as shown in Table 1. The production rate of styrene is 200 mol/h. Chemical name Formula Cost (5/kmol) Ethylbenzene C.HSCH:CH Styrene C.HSCHCH Benzene 57.1 75.9 CAH. 32.8 Toluene C.HSCH) 25.8 Ha Hydrogen Methanc Ethylene CH4 1.2 (as fuel) 4.0 (as fuel) 6.7 (as fuel) C:H4 Correlation for the product selectivity and distribution are given as following equations. S = 0.2 mol Styrene formed mol Ethylbenzene converted (1 - x)05 Mol Benzene = 0.033x -0.215x2 + 2.547x3 Mol Styrene *2015 1. Calculate the Economic Potential (EP) in Slkg at 75% of conversion. All by-products are saleable. (12) 2. What type of reactor is most suitable for this reaction system? Clearly explain the choice of selection (3) 3. Clearly explain how pressure help to favour forward reaction? (3)