2 (15PTS). The Neches Butane Products Co. makes butadiene, C4Hs, by separating b

Question

2 (15PTS). The Neches Butane Products Co. makes butadiene, C4Hs, by separating butenes, C4Hs, from refinery gases piped to them, and then further dehydrogenating the butenes to butadiene. In order to increase capacity they would like to be able to dehydrogenate butane, C4H1o, in one step without the intermediate separation of the butane. The C4He formed would be separated, and any unreacted C4H10 or C4Hs would be recycled to the reactor. One of the large engineering companies claims to have such a process. You have just been employed by Neches B.P. Co. -fresh from schooland are re to make some calculations on the proposed process: C4Hio()-> C4H (g) 2H2 (g) By heat exchange, the butane fed into the reactor is brought to the reaction temperature of 1000 K. It is desired to maintain an isothermal reactor. How much heat must be added or removed per g mole of butadiene formed? Assume the pressure is 100 kPa. What are some reasons why the heat load may be different from the value you calculate? Data: AHof of C4Hs (g) is -165.5 kJ/ g mole and that of C4Hio is -147 kJ/g mole Cp coefficients for C4H is given below. Temperature is in Kelvin: 11.92 1.35E-01 |-0.00004 767 | 7.368E-09

Explanation / Answer

The calculations need to be performed by assuming an isothermal reaction, as there is no variation of temperature throughout the reactor.

These calculations need to be supplemented by accurate prediction of the heat of formation the various compounds involved in the reaction.

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