Chemical Engineering Learning Resources

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Process Calculations

Orsat Analysis of Flue Gas

A hydrocarbon is burnt with excess air. The Orsat analysis of the flue gas shows 10.81% CO2, 3.78% O2 and 85.40 N2. Calculate the atomic ratio of C:H in the hydrocarbon and the % excess air.

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Flue Gas Analysis & Orsat Analysis

Natural gas containing 80% CH4, 15% C2H6 and 5% C3H8 is burnt with 50% excess air. Assuming that 90% of the carbon in the hydrocarbons are converted to CO2 and the rest to CO, determine

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Recycle Reactor

The reaction A à 2B + C takes place in a catalytic reactor (diagram is given below). The reactor effluent is sent to a separator. The overall conversion of A is 95%.

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Recycle Reactor - 2 separators

Methanol vapor can be converted into formaldehyde by the following reaction scheme:

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Humidity

Air at 30oC and 150 kPa in a closed container is compressed and cooled. It is found that the first droplet of water condenses at 200 kPa and 15oC.

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CCl4 Removal by Humidification

Carbon tetra chloride is to be removed from a polymer solution by bubbling dry air through it at 297 K. The resulting mixture has % relative humidity of 70.

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Humidification - Vapor Pressure

Nitrogen from a cylinder is bubbled through acetone at 1.1 bar and 323 K at the rate of 2 x 10-4 m3/min. The nitrogen, saturated with acetone vapor leaves at 1.013 bar,

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Solvent Recovery

A solvent recovery system delivers a gas saturated with benzene (C6H6) vapor that analyzes on a benzene free basis as follows: CO2 - 15%; O2 - 4% and N2 - 81%.

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Drying

A stock containing 1.526 kg moisture per kg dry solid is dried to 0.099 kg moisture per kg dry solid by countercurrent air flow. Fresh air entering contains 0.0152 kg

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Evaporation

An evaporator is fed continuously with 25 kg/hr of a solution which contains 10% NaCl, 10% NaOH and 80% H2O. During evaporation, H2O is removed from...

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Distillation

A solution of ethyl alcohol containing 8.6% alcohol by weight is fed at the rate of 5000 kg/hr to a continuous fractionating column operating at atmospheric pressure.

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Extraction

A liquid containing 47.5% acetic acid and 52.5% water is to be separated by solvent extraction using isopropanol. The solvent used is 1.3 kg per kg of feed.

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Heat of Sublimation

Calculate the enthalpy of sublimation of Iodine from the following data:

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Energy Requirement for Heating

The analysis of 15000 litre of gas mixture at standard conditions is as follows:

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Steam Requirement for Evaporation

An evaporator is fed with10000 kg/hr of a solution containing 1% solute by weight. It is to be concentrated to 1.5% solute by weight.

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Adiabatic Flame Temperature

Calculate the theoretical flame temperature of a gas having 20% CO and 80% N2 when burnt with 150% excess air. Both the reactants are at 25oC.

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