Topic: Energy Balance Calculations | Process Calculations - Video Lectures

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  Course Summary:
  Quick Review of Theory and Solving Representative Problems on Chemical Process Calculations covering the undergraduate chemical engineering syllabus, and latest GATE-exam syllabus: Material balance without and with Chemical Reactions, Humidification and Saturation Calculations, Combustion Calculations, Energy Balance Calculations.
  
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Energy Balance Calculations

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Select activity Theory with Examples

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Select activity Condensation of Moisture from Air

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Select activity Steam Mixing

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Select activity Heat Released from Reaction

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Select activity Adiabatic Flame Temperature of Natural Gas Combustion

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Select activity Maximum Allowable Conversion of Exothermic Reaction

Maximum Allowable Conversion of Exothermic Reaction Page

2002-13-pc

Ammonia is produced by the following reaction \[ \text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3 \] In a commercial process for ammonia production, the feed to an adiabatic reactor contains 1 kmol/s of nitrogen and stoichiometric amount of hydrogen at 700 K. What is the maximum allowable conversion (in percentage) in the reactor, if the adiabatic temperature rise across the reactor should not exceed 100 K. Assume the feed and product streams to be ideal gas mixtures. The heat of reaction at 700 K for the above reaction is calculated to be -94.2 kJ/mol. Mean molar heat capacities (\(C_P\)), in the range 700 - 800 K, are 0.03, 0.0289 and 0.0492 kJ/mol.K for nitrogen, hydrogen and ammonia respectively.

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Select activity Heat Loss from the Combustion System

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2014-42-pc

Carbon monoxide (CO) is burnt in presence of 200% excess pure oxygen and the flame temperature achieved is 2298 K. The inlet streams are at 25^oC. The standard heat of formation (at 25^oC) of CO and CO₂ are -110 kJ.mol^-1 and -390 kJ.mol^-1, respectively. The heat capacities (in J.mol^-1.K^-1) of the components are \[ C_{P_{\text{O}_2}}= 25 + 14\times10^{-3}T \qquad C_{P_{\text{CO}_2}} = 25 + 42\times10^{-3}T \] where, \(T\) is the temperature in K. The heat loss (in kJ) per mole of CO burnt is _______.

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Select activity Calorific Value of Fuels

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Select activity Adiabatic Mixing of Steam

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Select activity Heat of Formation from Heat of Combustion Data

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Select activity Heat Transferred from Reactor

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Select activity Adiabatic Combustion of Methane

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Isothermal Operation of Combustor to Convert Carbon and CO2 to CO Page

1997-13-pc

A feed at 1298 K, consisting of flue gas (\(\ce {CO2}\), \(\ce {O2}\) and \(\ce {N2}\)) and air, is passed through a bed of pure carbon. The reactions that occur both go to completion. \[ \begin {align*} \ce {CO2(g)} + \ce {C(s)} &\rightarrow 2\ce {CO(g)}, \quad \Delta H^\circ _R \text { at 298 K = 170 kJ/mol} \\
\ce {O2(g)} + 2\ce {C(s)} &\rightarrow 2\ce {CO(g)}, \quad \Delta H^\circ _R \text { at 298 K = \(-\)220.4 kJ/mol} \end {align*} \] The combustor is adiabatic and the product gases exit at 1298 K. Calculate the required moles of \(\ce {CO2}\) per mole of \(\ce {O2}\) in the feed stream, so that the net heat generated is zero and the bed temperature remains constant at 1298 K.
Data: Mean molar heat capacities, \(C_{Pm}\)

Substance	\(\ce{C}\)	\(\ce{O2}\)	\(\ce{CO}\)	\(\ce{CO2}\)
\(C_{Pm}\) (kJ/mol.K)	0.02	0.03	0.03	0.05

Select activity Heat Released from Combustion of CO

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Select activity Rate of Heat Removal from Ammonia Oxidizer

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Select activity Heat Removed from Ammonia Oxidizer - Multiple Reactions

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Select activity Temperature of Ammonia Oxidizer

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Select activity Energy Balance for Production of Acetylene from Methane

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Topic outline

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Energy Balance Calculations