P5.75 An absorber treats a gas stream contaiñing 2.5 gmol/min carbon dioxide with an aqueous stream with proprietuly additives that is flowing at 50 gmolMnin. The process is currently ope ated in a large spray tower, and you may treat the exiting liquid strean i recovers 80% of the CO, fed to the aqueous stream. a) Determine a value for the equilibrium distribution coefficient between the aqueous and gas streams (moles CO,/mole liquid/moles CO,/ mole gas). b) We'd like to improve the separation performance of the absorber. Frannie proposes using a new superadditive that increases the CO, solubility in the aqueous phase (increases the distribution coefficient) by 10%, that can be mixed with the incoming liquid stream. What is % recovery of CO, if the new additive is used? Zooey suggests stay- ing with the original aqueous solution, but splitting the liquid feed into two equal streams and operating two separators in a cross- current mode, as shown in the figure. You may still assume that, in each separator, the exiting liquid is in equilibrium with the entering gas. What percent recovery CO, is achieved with this process change? Do you prefer Frannie's idea or Zooey's, and why? 21 21

The carbon dioxide issuing out of a fermenter contains 0.01 mole fraction of ethanol, which has to be reduced to 0.0001 mole fraction by scrubbing with water in a countercurrent packed tower. The gas flow rate is 227.3 kmol/hr and may be assumed constant throughout the tower. The equilibrium mole fraction of ethanol in the gas phase y* is related to that in the liquid I as y* = 1.07x Determine the minimum liquid rate needed, and the number of overall gas-side transfer units needed at 1.5 times the minimum liquid rate. The entering liquid may be assumed to be free of ethanol.

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Hydrogen sulfide (H2S) gas in petroleum refinery is to be removed from a 984 kg/h gas mixture consist of 25 % w.w H2S into air, using counter current absorption column. Water is used as solvent in the absorption column. The water flow rate is 1.81 times the gas mixture flow rate. The air mole percent at the top of the column is 96.5%.   The air consists of 21.9% oxygen and 78.1% nitrogen.   Calculate;   To H2S molar flow rate and mole fraction entered the bottom of the column?   Note; Don’t round numbers; Minimum 4 decimals (0.0000)   Given A) The air consists of 21.9% oxygen and 78.1% nitrogen. B) The atomic weight of; 1. The hydrogen atom is 1 2.  The Oxygen atom is 16 3. The sulfur atom is 32 4. 1The nitrogen atom is 14

Hydrogen Sulfide has to be removed from a light refinery hydrocarbon stream before (40) the gas is subject to further processing. The feed gas contains 4.0 mole% H2S, and98% of which has to be removed by absorption with a weak aqueous basic solutionin a packed column. The feed gas rate is 80 kmol/h, and the entering solution has negligible amount of H2S. The concentration of H2S in the absorbent solution leaving the column is 0.015 mole H2S per mole of the H2S-free liquid. The equilibrium relation is linear and is given by y = 1.95 x. The 1.0 m diameter column operates at 25oC and 101.3 kPa total pressure. If the overall gas-phase film coefficient is Kya = 130 kmol/m3.h.∆y, calculate – (a) the molar flowrate of entering liquid solution, L (b) the number of transfer units, NOG (c) the packed height, lT

Hydrogen sulfide (H2S) gas in petroleum refinery is to be removed from a 984 kg/h gas mixture consist of 25 % w.w H2S into air, using counter current absorption column. Water is used as solvent in the absorption column. The water flow rate is 1.81 times the gas mixture flow rate. The air mole percent at the top of the column is 96.5%.   The air consists of 21.9% oxygen and 78.1% nitrogen.   Calculate;   The mole flow rate and mole fraction of H2S in the gas stream leaving at the top of the tower?    Note; Don’t round numbers; Minimum 4 decimals (0.0000)   Given A) The air consists of 21.9% oxygen and 78.1% nitrogen. B) The atomic weight of; 1. The hydrogen atom is 1 2.  The Oxygen atom is 16 3. The sulfur atom is 32 4. 1The nitrogen atom is 14

SEPERATIONS Absorption: Contaminant in a Gas Effluent We are going to absorb 90% of a contaminant in a gas stream containing 15.0 mole of the contaminant by absorntion into a water phase. The total inlet gas flow to the absorption column is 100.0 kgmole/hr and the total water flow is 200 kgmole/hr. Inlet water is NOT pure but contains 0.5% of the contaminant. I he process operates isothermally at 300k and a pressure of 1 atm. The equilibrium for this system is effectively characterized by either a Henry's Law relationship or Raoult's Law (using partial pressure), a general equilibrium relationship that can be used is ya=1.60*xa. plot the operating line and determine the minimum number of stages (graphically) for the equilibrium relationship provided. Confirm the results of part (a) using the analytical Kremser equation.

A gas mixture contains 0.03mole/mole of contaminant A. The solute free gas flow rate is 48.5 lbmole/(ft2 hr). We need to remove 85% of this contaminant from the gas stream. Liquid solvent is fed to the absorber in a countercurrent operational mode. Also the solvent being sent to this unit does not contain the contaminant The equilibrium plot is given below and it is also attached as a file. The tabular data is also presented if you prefer to construct your own plot. Using this information answer the questions below.   Is this process gas absorption or liquid stripping? Calculate minimum flow rate of liquid solvent. If the actual solvent rate is 50% higher than the minimum solvent flow rate, determine the actual solvent flow rate and the fraction of solute A in the liquid solvent effluent stream.

rate of 1.0 kg/ In a packed tower, a gas mixture with a 0.015 mole fraction of solute S at the inlet (the remainder being inert gases) undergoes counter- current absorption with water. The desired outlet concentration of the solute is 1% of its inlet concentration. The gas enters at a total flow /m²-s Given the dilute nature of the system, the equilibrium condition follows Henry's Law, represented by y = 1.75x, where y and x denote the mole fractions of solute S in the vapor and liquid phases, respectively. The column is packed with a material that yields an overall gas-phase mass transfer coefficient (Kya) of 0.06 kg-mole m³ smole fraction The tasks are to calculate: kg m2.s (molecular weight = 29), and pure water is introduced at a rate of 1.6 (a) the required height of the packing for the separation, and (b) the minimum rate of liquid needed for the separation. Additionally, it is asked how the required packing height would change if a different packing type with a Kya of kg-mole…