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7.36: Untitled Page 181

  • Page ID
    18314
  • Chapter 7

    Figure 7.3. Pyrolysis of acetone

    reacts during the pyrolysis to form ethylene ( C H ) and carbon monoxide 2

    4

    ( CO ) . At industrial reactor conditions, the yields for this set of reactions are given by

    RCH CO

    2

    Y

     Yield of CH CO/CH COCH

     0 9

    . 5

    CH2CO

    2

    3

    3

     RCH COCH

    3

    3

    RC H

    2 4

    Y

     Yield of C H /CH COCH

     0 0

    . 15

    C2H4

    2

    4

    3

    3

     RCH COCH

    3

    3

    For the conversion of acetone given by

     RCH COCH

    3

    3

    C  Conversion of CH COCH

     0 . 98

    3

    3

    ( M

    )

    CH3COCH3 feed

    determine the mole fraction of all components in the reactor product stream.

    7‐4. Ethylene oxide can be produced by catalytic oxidation of ethane using pure oxygen. The stream leaving the reactor illustrated in Figure 7.4 contains Figure 7.4. Production of ethylene oxide

    Material Balances for Complex Systems

    339

    non‐reacted ethane and oxygen as well as ethylene oxide, carbon monoxide, carbon dioxide, and water. A gas stream of 10 kmol/min of ethane and oxygen is fed to the catalytic reactor with the mole fraction specified by Stream #1:

    y

    y

     0 . 50

    (1)

    C2H6

    O2

    The reaction occurs over a platinum catalyst at a pressure of one atmosphere and a temperature of 250 C. Some of the mole fractions in the exit stream have been determined experimentally and the values are given by

    Stream #2:

    y

     0 . 287 ,

    y

     0 . 151 ,

    y

     0 . 076

    (2)

    C2H4O

    C2H6

    O2

    In this problem you are asked to determine the global rates of production of all the species participating in the catalytic oxidation reaction.

    7‐5. In a typical experimental study, such as that described in Problem 7‐4, one would normally determine the complete composition of the entrance and exit streams. If these compositions were given by

    ( y

    )  0 5

    . 0 ,

    ( y

    )  0 5

    . 0 ,

    ( y

    )

    .

    0 0

    C H

    1

    O

    1

    H O 1

    Inlet Stream:

    2 6

    2

    2

    ( y

    )

     0 0

    . ,

    ( y

    )  0 0

    . ,

    ( y

    ) 

    .

    0 0

    CO 1

    CO2 1

    C2H4O 1

    ( y

    )  0 1

    . 4 ,

    ( y

    )  0 0

    . 8 ,

    ( y

    )

     0 . 43

    C H

    2

    O

    2

    H O 2

    Outlet Stream:

    2 6

    2

    2

    ( y

    )

     0 0

    . 5 ,

    ( y

    )  0 0

    . 3 ,

    ( y

    )  0 . 27

    CO 2

    CO2 2

    C2H4O 2

    how would you determine the six global rates of production associated with the partial oxidation of ethane? One should keep in mind that the experimental values of the mole fractions have been conditioned so that they sum to one.

    7‐6. Aniline is an important intermediate in the manufacture of dyes and rubber.

    A traditional process for the production of aniline consists of reducing nitrobenzene in the presence of iron and water at low pH. Nitrobenzene and water are fed in vapor form, at 250 C and atmospheric pressure, to a fixed‐bed reactor containing the iron particles as illustrated in Figure 7.6. The solid iron

    index-349_1.png

    340