A mixed hydrocarbon fuel of butane (C4H10) and propane (C3H8) is burned in air (

Question

A mixed hydrocarbon fuel of butane (C4H10) and propane (C3H8) is burned in air (molar ratio of 3.76 N2: 1 O2). The feed to the reactor (fuel + air) is at 200°C and 1 atm combines a fresh feed stream and a recycle stream. The hydrocarbon fuel enters the reactor at 25 mol/s and is composed of 62 mol% butane and the rest propane, while the air enters the reactor at 238 mol/s. The single pass conversions of the butane and propane are the same value. The product stream contains 4 moles of carbon dioxide (CO2) for every mole of carbon monoxide (CO). Additionally, 3 moles of water (H2O) for every mole of hydrogen (H2) are produced. The product gas contains 3.5 mol/s CO. The products leave the reactor as an ideal gas at 600°C and 3 atm. A separator splits the reactor products into two streams: a product stream containing all of the CO, CO2, H2, and water, and a stream containing the unreacted hydrocarbons and air. The stream containing the unreacted species is split with 80% of the total molar flow rate being recycled and the rest being purged.

Highlight the sentence that includes the basis.

Explanation / Answer

The hydrocarbon fuel enters the reactor at 25 mol/s and is composed of 62mol% butane and the rest propane, while the air enters the reactor at 238 mol/s.

Basis is 25 mol/s of fuel.

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