23-Chem-A1 Process Balances and Chemical Thermodynamics

Questions by sitting

December 2019

1. Question 1: Standard Heat of Reaction — Oxidation of Toluene to Benzaldehyde
2. Question 2: Wood Combustion — Ultimate Analysis from an Orsat Flue-Gas Report
3. Question 3: Adiabatic Flash of a Preheated Crude Oil
4. Question 4: Part B — Chemical Thermodynamics
5. Question 5: Fugacity of (Metastable) Liquid Hydrogen Chloride
6. Question 6: Adiabatic-Mixing Temperature of a Cleaning Solution

December 2018

1. Question 1: Two-Column Benzene–Toluene–Xylene Distillation Train
2. Question 2: Cooling and Dehumidification of Humid Air
3. Question 3: Methanol Synthesis Loop with Total Recycle
4. Question 4: Part B — Chemical Thermodynamics
5. Question 5: Equilibrium Composition of Three Pentane Isomers
6. Question 6: Maximum HCN Yield from Non-Ideal Nitrogenation of Acetylene

May 2018

1. Question 1: Propane Combustion with Excess Air
2. Question 2: Air Dehumidification with a Bypass
3. Question 3: Countercurrent Rotary Dryer — Air Requirement
4. Question 4: Fugacity Coefficients of HCl and DCM
5. Question 5: Standard Gibbs Energy of Ethanol Decomposition at 443 K
6. Question 6: Isothermal Expansion of Nitrogen — Ideal vs. van der Waals

December 2017

1. Question 1: Solids Drying with Air Recycle
2. Question 2: Theoretical (Adiabatic) Flame Temperature
3. Question 3: Two-Column Distillation Train (BTX)
4. Question 4: van der Waals Residual Properties of CO₂
5. Question 5: Isomerization Equilibrium and a Dew Point
6. Question 6: Air-Cycle Air-Conditioner — Coefficient of Performance

May 2017

1. Question 1: HDA Process — Purge/Recycle Balance for Benzene from Toluene
2. Question 2: Coal Combustion — Air, Flue-Gas Mass and Volume
3. Question 3: Sensible Heat Lost by a Cooling Flue Gas
4. Question 4: Fugacity of Propane over Water and Its Henry's Constant
5. Question 5: Relative Volumetric Feed Rates of Real Ethylene and Oxygen
6. Question 6: Isothermal Compression of Non-Ideal Ethylene

December 2016

1. Question 1: Soda-Ash Calciner with Dry Recycle
2. Question 2: Combustion of Wood by Orsat Analysis
3. Question 3: Heat of Reaction versus Temperature (Kirchhoff’s Law)
4. Question 4: Fugacity of Liquid Hydrogen Chloride
5. Question 5: Favourable T–P Region for Methanol Synthesis
6. Question 6: Isopropanol–Benzene VLE at 45 °C

May 2016

1. Question 1: Iron Blast-Furnace Charge and Slag Balance
2. Question 2: Standard Heat of Reaction for Toluene Oxidation
3. Question 3: Crystallization and Rotary-Filter Entrainment
4. Question 4: Calcination of Sodium Bicarbonate — Reaction Equilibrium
5. Question 5: Ethanol–Benzene Azeotrope from a Single Tie Line
6. Question 6: Gas-Phase Decomposition Equilibrium in a Rigid Vessel

December 2015

1. Question 1: Combustion of a Fuel Oil in a Boiler Furnace
2. Question 2: Adiabatic Flash of a Heated Crude Oil
3. Question 3: Ammonia-Synthesis Loop with Argon Purge
4. Question 4: Thermodynamics of Calcium-Oxalate Dissociation
5. Question 5: Reactive Vapor–Liquid Equilibrium of n-Butane Isomerization
6. Question 6: Adiabatic Mixing of Acetone and Dichloromethane

May 2015

1. Question 1: Cooling a Hot Flue Gas by Spraying Liquid Water
2. Question 2: Adiabatic-Corrected Flash of an Ethanol–Water Mixture
3. Question 3: Two-Stage Water Recovery with Interstage Compression
4. Question 4: Ethylbenzene Reactor with a Di-Ethylbenzene Side Reaction
5. Question 5: Activity Coefficients and Excess Gibbs Energy of Acetone–Chloroform
6. Question 6: Deriving Activity Coefficients from a $G^E$ Correlation
7. Question 7: Reaction Equilibrium of ZnO(s) + CO(g) ⇌ Zn(g) + CO₂(g)

December 2014

1. Question 1: Seawater Purification by Freezing
2. Question 2: Vapour Pressure of Gasoline in a Sealed Can
3. Question 3: Ethyl Chloride Reactor with Recycle
4. Question 4: Adiabatic Flame Temperature of a Fuel Gas
5. Question 5: Multistage Compression for Air Liquefaction
6. Question 6: Acrylonitrile–Water Two-Phase System (Margules)
7. Question 7: Water-Gas Shift Reaction Equilibrium

May 2014

1. Question 1: Shaft Work of a Steam Turbine
2. Question 2: Feed-Gas Flow Rates to a Steam–Methane Reformer Heater
3. Question 3: Multi-Unit Material Balance on a Casein Plant
4. Question 4: Adiabatic Mixing of Steam and Syngas
5. Question 5: Reversible Isothermal Compression of a CH₄/N₂ Mixture
6. Question 6: Joule–Thomson Throttling of Oxygen
7. Question 7: Vapour–Liquid Equilibrium of Benzene/Acetonitrile
8. Question 8: Gas-Phase Equilibrium for Ethylene Synthesis

December 2013

1. Question 1: Acetone Evaporated into Nitrogen and Compressed
2. Question 2: Evaporator–Crystallizer Production of Potassium Sulfate
3. Question 3: Blending Steam Streams to Make 300 °C Superheated Steam
4. Question 4: Time to Heat a Stirred Tank and Its Contents
5. Question 5: Excess Gibbs Energy and Vapour–Liquid Equilibrium of a Binary Mixture
6. Question 6: Equilibrium of a Gaseous Isomerization
7. Question 7: Enthalpy and Entropy Change of a Real Gas Across a Valve

May 2013

1. Question 1: Crystallization Separation of Sylvinite
2. Question 2: Methanol Condensed in a Distillation Accumulator
3. Question 3: Reactor with Recycle and Purge (Inert Build-up)
4. Question 4: Coke Deposit in Propane Dehydrogenation
5. Question 5: Heat Duty for Real-Gas Ethylene Heating
6. Question 6: Bubble- and Dew-Point Pressures from the Margules Model
7. Question 7: Synthesis-Gas Reaction Equilibria

Undated paper

1. Question 1: Auditorium Air-Conditioning — Recycle Humidity Balance
2. Question 2: Roasting a Pyrite / Zinc-Sulfide Charge — Cinder Balance
3. Question 3: Sulfur Burner and Waste-Heat Boiler — Steam Raised
4. Question 4: Part B — Chemical Thermodynamics
5. Question 5: Roaster Gas — Heat Content of 1 kmol above 25 °C
6. Question 6: Methane–Steam Reforming — Equilibrium Composition at 1000 K