A fuel gas contains 80% propane (C3H8) by mole and 20% butane (C4H10) by mole. The fuel, mixed with a recycle stream is fed to a furnace, where conversions of 80% propane and 50% butane are achieved. The fuel in the furnace is burned with 20% excess air via complete combustion. In the outlet of furnace all of the propane and butane is separated by a filter and this stream containing equimolar amounts of propane and butane is recycled to the reactor inlet. The remaining stack gas is released. The CO2:O2 ratio in the stack gas is found to be 16.0:19.1. Determine the composition of stack gas on wet basis.

  1. A fuel gas contains 80% propane (C3H8) by mole and 20% butane (C4H10) by mole. The fuel, mixed with a recycle stream is fed to a furnace, where conversions of 80% propane and 50% butane are achieved. The fuel in the furnace is burned with 20% excess air via complete combustion. In the outlet of furnace all of the propane and butane is separated by a filter and this stream containing equimolar amounts of propane and butane is recycled to the reactor inlet. The remaining stack gas is released. The CO2:O2 ratio in the stack gas is found to be 16.0:19.1.
  2. Determine the composition of stack gas on wet basis. 

Determine the ratio of fresh feed propane/recycled propane. 

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