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#Question id: 15465
#Section 4: Fundamentals of Biological Engineering
50 g benzaldehyde vapour is condensed at 179°C. What is the enthalpy of the liquid relative to the vapour? (Standard latent heat for vaporisation for benzaldehyde is 38.40 kJ gmol-1)
TLS Online TPP Program
#Question id: 15466
#Section 4: Fundamentals of Biological Engineering
Water at 25°C enters an open heating tank at a rate of 10 kg h-1. Liquid water leaves the tank at 88°C at a rate of 9 kg h-1; 1 kg h-1 water vapour is lost from the system through evaporation. At steady state, what is the rate of heat input to the system?
h (liquid water at 25°C = 104.8 kJ kg-1)
h (liquid water at 88°C = 368.5 kJ kg-1)
h (saturated steam at 88°C = 2656.9 kJ kg-1)
TLS Online TPP Program
#Question id: 15467
#Section 4: Fundamentals of Biological Engineering
Fumaric acid is produced from Malic acid using Fumarase. Calculate standard heat of reaction for the following transformation:
C4H6O5 → C4H4O4 + H2O
Given: (Δhc°)malic acid= -1328.8 kJ/gmol
(Δhc°)Fumaric acid= -1334.0 kJ/gmol
TLS Online TPP Program
#Question id: 15468
#Section 4: Fundamentals of Biological Engineering
In downstream processing of gluconic acid, concentrated fermentation broth containing 20% (w/w) gluconic acid is cooled in a heat exchanger prior to crystallisation. 2000 kg h-1 liquid leaving an evaporator at 90°C must be cooled to 6°C. Cooling is achieved by heat exchange with 2700 kg h-1 water initially at 2°C. The final temperature of the cooling water is 50°C.
Assume (heat capacity of gluconic acid is 0.35 cal g-1 °C-1).
h (liquid water at 90°C = 376.9 kJ kg-1)
h (liquid water at 6°C = 25.2 kJ kg-1)
h (liquid water at 2°C = 8.4 kJ kg-1 )
h (liquid water at 50°C = 209.3 kJ kg-1)
h (gluconic acid at 90°C=0)
How much heat is removed to the cooling water?
TLS Online TPP Program
#Question id: 15469
#Section 4: Fundamentals of Biological Engineering
What is the rate of heat loss from the gluconic acid solution to the surroundings?
TLS Online TPP Program
#Question id: 15470
#Section 4: Fundamentals of Biological Engineering
In the stoichiometric equation given below identify which one of the following corresponds to oxygen balance:
CwHxOyNz + aO2 + bHgOhNi
cCHαOβNδ + dCO2 + eH2O