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Enlist the tower internals for packed and tray tower and explain their roles. Also compare Tray tower with Packed tower.
Classify G-L mass transfer operations and give examples of each operation.
Deduce an equation for molar flux for equimolal counter-current diffusion in case of steady state molecular diffusion for gas phase.
In an oxygen–nitrogen gas mixture at 1 atm. 25°C, the concentrations of oxygen at two planes 0.2 cm apart are 10% and 20% (by volume) respectively. Determine the flux of oxygen when
Determine the flux of butanol at 20°C under unidirectional steady state conditions through a 0.1 cm thick film of water when the concentrations of butanol at the opposite sides of the film are, respectively 10% and 4% butanol by weight. The diffusivity of butanol in water solution is 5.9 x 10– 6 cm²/sec. The densities of 10% and 4% butanol solutions at 20°C may be taken as 0.971 and 0.992 g/cc respectively. Also determine the flux if equimolal countercurrent diffusion is taking place.
1000 kg of crushed oil seed (19.5 % oil and 80.5 % meal) is extracted with 1500 kg of pure hexane in a single stage batch extraction vessel. Determine coordinates of point M1 representing mixture of solid- solvent.
At high temperature, two pair partially soluble liquid system behaves like one pair partially soluble liquid system. Agree or not? Support the answer.
A gas containing 4 % cyclohexane and rest inert has to be treated with Non- volatile absorption oil in a packed tower. It is required to remove 98 % of cyclohexane of the gas. The feed solvent is free from cyclohexane. If the feed gas rate is 80 kmol/hour, calculate the minimum solvent rate and actual liquid rate if it is 1.8 times of Lsmin. Equilibrium relation is given Y = 0.2X / (1+0.8X)
Discuss various parameters to be considered for selecting solvent for Liquid-Liquid Extraction. For single stage, determine distribution coefficient if feed, pure solvent and extract amounts are 500, 400 and 600 kg respectively. Feed and extract has 45% and 30 % solute respectively.
Discuss the effect of agitation and temperature on leaching? “High temperature is not always preferable for leaching.” Justify the statement.
Pure isopropyl ether of 450 kg/h is being used to extract an aqueous solution of 30 wt % acetic acid by counter-current multistage extraction. Rate of aqueous solution is one third of solvent rate. The exit acid concentration in the aqueous phase is 10 wt %. Calculate the number of stages required. Data on wt % basis is given: Aqueous phase Ether phase Acetic acid water Ether Acetic acid water Ether 0.69 98.1 1.2 0.18 0.5 99.3 1.41 97.1 1.5 0.37 0.7 98.9 2.89 95.5 1.6 0.79 0.8 98.4 6.42 91.7 1.9 1.93 1 97.1 13.3 84.4 2.3 4.82 1.9 93.3 25.5 71.1 3.4 11.4 3.9 84.7 36.7 58.9 4.4 21.6 6.9 71.5 44.3 45.1 10.6 31.1 10.8 58.1 46.3 37.1 16.5 36.2 15.1 48.7
Differentiate between physical and chemical adsorption and cite examples of the same. “Absorption is preferable at low T and high P.” True or false/? Justify.
State various theories of mass transfer co-efficient and discuss film theory at length. Also derive its equation and mention its limitations.
Explain min L/G ratio with neat sketch for gas absorption. “Absorber cannot be operated at min L/G” Justify.
Enlist different industrial liquid extraction equipment and explain any one in detail with neat sketch.
The solubility of copper sulphate in water at 80 °C is 55 g CuSO4 per 100 g of water and that at 30 °C is 25 g CuSO4 / 100 g water. One ton of saturated solution at 80 °C is slowly cooled down to 30 °C. 5 % water is lost by evaporation. Determine weight of crystals and mother liquor. Hydrated form is represented as CuSO4 ·5H2O.
Enlist different industrial leaching equipment and explain any one in detail with neat sketch.
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
BE Chemical
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Official Gujarat Technological University (GTU) examination paper for Mass Transfer Operations I (Summer 2026, B.E. · Chemical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3150501 Mass Transfer Operations I
Official GTU PDF · Summer 2026
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