The minimum liquid rate to be used in an absorber corresponds to an operating line (A) Of slope = 1 (B) Of slope = 0.1 (C) Tangential to the equilibrium curve (D) None of these

The minimum liquid rate to be used in an absorber corresponds to an

operating line

(A) Of slope = 1

(B) Of slope = 0.1

(C) Tangential to the equilibrium curve

(D) None of these

by

1 Answer

Answer :

(C) Tangential to the equilibrium curve

by

Related questions

Pick out the wrong statement: (A) Absorption factor is constant, when the equilibrium and operating lines are straight (B) In case of a stripper, the equilibrium curve is always below the operating line (C) In case of an absorber, the operating line is always above the equilibrium curve (D) In the absorption of low solubility gases, the liquid film is the controlling resistance

Description : Pick out the wrong statement: (A) Absorption factor is constant, when the equilibrium and operating lines are straight (B) In case of a stripper, the equilibrium curve is always below ... (D) In the absorption of low solubility gases, the liquid film is the controlling resistance

Last Answer : (B) In case of a stripper, the equilibrium curve is always below the operating line

For water-ethanol system, the minimum reflux ratio (A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve (B) Is computed from the intercept of the operating line (C) Cannot be computed (D) Is the optimum reflux ratio

Description : For water-ethanol system, the minimum reflux ratio (A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve (B) Is computed from the intercept of the operating line (C) Cannot be computed (D) Is the optimum reflux ratio

Last Answer : (A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve

In case of an absorber, the operating (A) Line always lies above the equilibrium curve (B) Line always lies below the equilibrium curve (C) Line can be either above or below the equilibrium curve (D) Velocity is more than the loading velocity

Description : In case of an absorber, the operating (A) Line always lies above the equilibrium curve (B) Line always lies below the equilibrium curve (C) Line can be either above or below the equilibrium curve (D) Velocity is more than the loading velocity

Last Answer : (A) Line always lies above the equilibrium curve

Pick out the wrong statement. (A) The operating line always lies above the equilibrium solubility curve in case of a single component absorber (B) The operating line always lies below the equilibrium solubility curve in case of a single component stripper (C) The operating pressure in solvent extraction system should be below vapor pressures of all components (D) The solubility of a particular gas in ideal solution in any solvent is always the same

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Last Answer : (C) The operating pressure in solvent extraction system should be below vapor pressures of all components

If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is (A) L/G (B) G/L (C) Always < 1 (D) None of these

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Last Answer : (A) L/G

The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is (A) 0 (B) ∞ (C) -ve (D) +ve

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H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is (A) 2.0 (B) 1.56 (C) 1.0

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Last Answer : (A) 2.0

‘L/mG’ is the expression for (A) Absorption factor (B) Brinkman number (C) Slope of operating line in absorber (D) Slope of operating line in stripper

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Last Answer : (A) Absorption factor

When both the fluids flow concurrently in an absorber, the slope of the operating line is (A) -ve (B) +ve (C) 1 (D) -1

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Last Answer : (A) -ve

For an absorber, both equilibrium and operating line will be straight for (A) Concentrated solution and non-isothermal operation (B) Dilute solution and non-isothermal operation (C) Dilute solution and isothermal operation (D) Concentrated solution and isothermal operation

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As the reflux ratio in a distillation column is increased from the minimum, the (A) Slope of the operating line in stripping section decreases (B) Number of plates decreases very slowly first and then more and more rapidly (C) Total cost first decreases and then increases (D) Liquid flow increases while the vapor flow decreases for a system

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Last Answer : (C) Total cost first decreases and then increases

. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line). (A) L/mG (B) G/mL (C) mL/G (D) LG/m

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The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling? (A) Liquid side (B) Gas side (C) Interfacial (D) Both liquid and gas side

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Last Answer : (B) Gas side

In case of a desorber (stripper), the (A) Operating line always lies above the equilibrium curve (B) Operating line always lies below the equilibrium curve

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Last Answer : (B) Operating line always lies below the equilibrium curve

For stripping of a gas in a counter current stripper, the operating line (A) Lies above the equilibrium curve (B) Lies below the equilibrium curve (C) Can lie above or below the equilibrium curve (D) Is always parallel to the equilibrium curve

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Pick out the correct statement. (A) The slope of the stripping line is always less than unity (B) For a given separation in a binary distillation column, with increase in reflux ratio (above the minimum reflux ratio), the fixed cost of the distillation column first increases and then decreases (C) In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux (D) Kremser-Brown-Souder's equation is used to calculate the efficiency of a plate tower

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On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in (A) Greater degree of separation with a fixed number of trays (B) Increased reboiler load

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The operating line for an absorber is curved, when plotted in terms of (A) Mole fractions (B) Mole ratios (C) Partial pressure (D) Mass fractions

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For a single component absorber, the operating line is straight only when plotted in term of __________ units. (A) Partial pressure (B) Mole ratio (C) Mole fraction (D) None of these

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The curve of metacentre for a floating body __________ the curve of buoyancy. (A) Is always below (B) Is the evolute of (C) Intersects at right angle (D) Is tangential to

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Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is equal to HTU, when both the operating line & the equilibrium lines are parallel (C) Hatta number is important in case of gas absorption with chemical reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process

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In an absorber, HETP does not vary with the (A) Flow rate of liquid (B) Flow rate of gas (C) Type and size of packing (D) None of these

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If the slope of a line for infiltration capacity curve is 1/1.737, the value of constant k in Horton's equation of infiltration capacity curve, is (A) 2.0 (B) 2.5 (C) 4.0 (D) 5.0

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