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stiochiometry (2).pptx - CHE 310 CONVERSION / DEGREE OF...

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CHE 310CONVERSION / DEGREE OF COMPLETIONDefinition:Conversion is the fraction of the feed or some (special/key) material in the feed whichis converted into products.Degree of CONVERSION (Completion):Degree of Conversion (Completion) of a reaction is the percentage or fraction of thelimiting reactant converted into products.Moles (or mass) of feed (or a compound in the feed that reacts)% Conversion = 100-----------------------------------------------------------------------------Moles (or mass) of feed (or cpd in the feed introduced)EXAMPLE:10kg. C7H10is oxidised to form 14.4 kg of CO2. Calculate the percentage ofconversion.2O
C7H16 equivalent toCO2 in the product= 0.0468 kgkgmol C7H16C7H16 in the reactant (X) =10kg C7H161kg mol C7H16100.1 kg C7H16=0.0999kg mol C7H160.0468% Conversion=--------------------x100=46.8 % of C7H160.0999Also using the extent of reaction:Extent of reaction that actually occursConversion =100----------------------------------------------------=---------x100Extent of reaction that would occur if complete€maxreaction took placeNote: Since the numerator and denominator of the fraction contain the same units, thenconversion is dimensionless.Assignment: P247No. 314.4 kg CO21kg mol CO21kg mol C7H16X44.0 kg CO27kg mol CO2
SELECTIVITYSelectivity is the ratio of the moles of aparticular product (usually the desired) productproduced to the moles of another (usually undesired or byproduct) of the productproduced in a set of chemical reactions.Eg: The conversion of methanol into ethylene (C2H4) or propylene (C3H6) by thereactions below.2CH3 OH------C2H4+2H203CH3 OH------C3H6+3H2O20C2H415C3H610105504060800406080%Conversion of CH3OH% Conversion of CH3OH
From the abovefigures,Conversion of C2H419 mol %Conversion of C3H168 mol %Selectivity=19/82.4 C2H4 per mol C3H6YIELDYield has no fixed definition.(i)Based of feed, Yield is the amount (Mass or moles) of desired product obtaineddivided by the amount of the kg (limiting) reactant feed.(ii)Yield (based on reactant consumed) is the amount (mass or moles) of desiredproduct obtained divided by the amount of the key (usually thelimiting) reactantconsumed.(iii) Yield(based on theoretical consumption of the limiting reactant) is the amount(mass or moles) of a product obtained divided by the theoretical (expected) amountof the product that would be obtained based on the limiting reactant in the chemicalreaction equation(s)if it were completely consumed.

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Term
Fall
Professor
Udoethina

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