09-27-10

09-27-10 - 1/27/11 DOFA Only two independent molecular...

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1/27/11 Molecular and Atomic Balances When a chemical reaction occurs, only a total mass balance reduces to the simple: input=output Balances on reactive species involve generation and consumption We can write balances on individual atoms that are of the form:
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1/27/11 Analyzing Chemical Reactions 3 methods can be used: Molecular species balance(similar to our past problems) Atomic species balance extents of reaction
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1/27/11 DOFA, baby! Remember when doing DOFA, we must consider how much linearly independent information we have. If two molecular species are in the same ratio to each other everywhere they appear in a process, they must be treated as one species (ex. nitrogen and oxygen in air when no reaction occurs with either)
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Unformatted text preview: 1/27/11 DOFA Only two independent molecular material balances since N and O always appear together in same ratio Only two independent atomic balances since the ratio of N to O is constant as is the ratio of C to Cl 1/27/11 DOFA Chemical reactions are independent only if the stoichiometric equations of any one of them cant be obtained by adding and subtracting multiples of the others A-->2B B C A 2C 1/27/11 Example Methane is burned with air in a continuous steady-state combustion reactor to yield a mixture of carbon monoxide, carbon dioxide, and water. The reactions taking place are: CH4 + 3/2 O2 O CO + 2H20 CH4 + 2O2 & CO2 + 2H20 The feed to the reactor contains 7.80...
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09-27-10 - 1/27/11 DOFA Only two independent molecular...

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