Process Calculations - Video Lectures
Topic outline
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Day2: Review, Atomic Balance - Theory Page
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Combustion of Pentane Page
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Chlrorination of Benzene Page
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Formaldehyde from Methane - Extent of Reaction, Atomic Balance - Example Page
2021-37-pc
Formaldehyde is produced by the oxidation of methane in a reactor. The following two parallel reactions occur. \[ \begin {align*} \ce {CH4} + \ce {O2} &\rightarrow \ce {HCHO} + \ce {H2O} \\
\ce {CH4} + \ce {2O2} &\rightarrow \ce {CO2} + \ce {2H2O} \end {align*} \] Methane and oxygen are fed to the reactor. The product gases leaving the reactor include methane, oxygen, formaldehyde, carbon dioxide and water vapor.60 mol/s of methane enters the reactor. The molar flow rate (in mol/s) of \(\ce {CH4}\), \(\ce {O2}\) and \(\ce {CO2}\) leaving the reactor are 26, 2 and 4, respectively. The molar flowrate of oxygen entering the reactor is ________ mol/s.
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Combustion of Propane: Atomic Balance - Extent of Reaction - Workout Page1990-11-i-pc
Pure propane (\(\ce {C3H8}\)) is burnt with an excess of air to give the following analysis of combustion products in volume percent:
\(\ce {CO2}\) = 5.0, \(\ce {CO}\) = 3.5, \(\ce {H2O}\) = 11.4, \(\ce {O2}\) = 7.0 and \(\ce {N2}\) = 73.1
Calculate the percentage of excess air used. -
Combustion of Methane - Atomic Balance - Extent of Reaction Page
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Analysis of Fuel Gas Page
A fuel gas consisting entirely of methane and ethane is burned with air to yield a flue gas whose Orsat analysis is 8.68 mol% \(\ce{CO2}\), 6.44% \(\ce{O2}\) and 84.88% \(\ce{N2}\). Calculate the following :
- The analysis of the fuel in mole percent, methane = _____ , and ethane the balance.
- The percent excess air = _______
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Pure propane is burnt in an excess of air to give the following analysis of combustion products in volume percent: \(\ce{CO2} = 5.0, \ce{CO} = 3.5, \ce{H2O} = 11.4, \ce{O2} = 7.0, \ce{N2} = 73.1\). Calculate the percent of excess air used.
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Chlorination of Carbondisulfide Page
Catalytic vapor-phase chlorination of carbon disulfide (\(\ce{CS2}\)) gives carbon tetrachloride: \[ \ce{CS2} + \ce{3Cl2} \rightarrow \ce{CCl4} + \ce{S2Cl2}\] The products leaving the converter analyzed 26.0 mol% \(\ce{CCl4}\), 26.0% \(\ce{S2Cl2}\), 17.5% \(\ce{CS2}\) and 30.5% \(\ce{Cl2}\). Determine the following:
- The excess reactant ______ (carbon disulfide / chlorine)
- Percentage excess of excess reactant _____
- Percentage conversion of limiting reactant _____
- kg of \(\ce{CCl4}\) obtained per kg of chlorine admitted _____
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Yield, Selectivity of Reactions Page
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Yield and Selectivity - Dehydrogenation of Ethane Page
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Combustion of Coal Page
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Combustion of Methanol PageFelder3E-4-71
Liquid methanol (density = 792 g/L) is fed to a space heater at a rate of 12 L/h and burned with excess air. The product gas is analyzed and the following dry-basis mole percentages are determined: \(\ce{CH3OH}\) = 0.45%, \(\ce{CO2}\) = 9.03%, and \(\ce{CO}\) = 1.81%.
- Calculate the percentage conversion of methanol ______ , the percentage excess air fed ______ , and, mole% of water in the product gas _______.
- Calculate the molar flow rate of dry product gas (i.e., excluding water vapor) ______ mol/h, and that of water vapor ________mol/h.
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Ethylene Bromide from Ethylene Page
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Methanol Production with Recycle Page
Methanol is produced by reacting carbon monoxide and hydrogen. A fresh feed stream containing \(\ce{CO}\) and \(\ce{H2}\) joins a recycle stream and the combined stream is fed to a reactor. The reactor outlet stream flows at a rate of 350 mol/min and contains 63.2 mol% \(\ce{H2}\), 27.3% \(\ce{CO}\) and 9.5% \(\ce{CH3OH}\). This stream enters a cooler in which most of the methanol is condensed. The liquid methanol condensate is withdrawn as a product, and the gas stream leaving the condenser—which contains \(\ce{CO}, \ce{H2}\), and 0.40 mol% uncondensed \(\ce{CH3OH}\) vapor—is the recycle stream that combines with the fresh feed. Calculate:
- the molar flow rates (mol/min) of \(\ce{CO}\) and \(\ce{H2}\) in the fresh feed. (i) \(\ce{CO}\) = _____, (ii) \(\ce{H2}\) = _____
- the production rate of liquid methanol ____ mol/min
- the single-pass conversion of carbon monoxide ____ %
- the overall conversion of carbon monoxide ____ %
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Methanol Production with Recycle and Purge Page
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Flowrate of a Component from Conversion Data Page
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Ethanol from Ethylene - Recycle, Purge Page
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Amount of Reactant in Purge Page
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Pressure vs. Conversion in a Batch Reactor Page