ChEn 2001 Lecture Notes 9/9/2013

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Department
Chemical Engineering
Course
CHEN 2001
Professor
Kechun Zhang
Semester
Fall

Description
ChEn 2001 9/9/2013  Material Balance and Process Economics o Atomic mass: 1 amu = 1.66*10 kg-27 o C = 12.011 amu 23 o Molar Mass: mass in g of 1 mol (6.02*10 )  Unit: g/(g*mol) = g/mol o Ex: glucose C H6O12 6  Molecular weight = 6*12+12*1+6*16 = 180 g/(g*mol) (B.1)  If you have 10 g glucose, divide 10/180 to get moles of glucose  0.056 g*mol = 0.056 mol o g/(g*mol) = kg/(kg*mol)=lb/(lb*mol)=ton/(ton*mol)….but molecular weight = 180 for all of those units o 10 kgmol glucose = 10*180 kg….same for all the other units  Atom economy: measure of the efficiency for converting raw materials  Fractional atom economy = mass of desired product/total mass of reactant o How efficient the process is o ; where ν is the coefficient and M is the molecular weight ∑  The numerator contains information of the target (desired) product  The denominator contains information about all the reactants  The denominator is negative just to cancel out with the negative coefficients in the reactants o Example 1: Le Blanc Process: 2NaCl + H SO2+ 24 + CaCO  Na 3O + 2H2l 3 + 2CO +2CaS  Na 2O i3 the target product Compound NaCl -2 58.5 H 2O 4 -1 98 C -2 12 CaCO -1 100 3 *Na 2O 3 1 106 HCl 2 36
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