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Equipment Design

Equipment Design. Done By : Lamya AL-Hussaini. Distillation Column. Distillation column is used to separate components according to their boiling point temperature. The objective of this distillation is to separate styrene from water and ethylbenzene. Assumptions:. Sieve plate.

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Equipment Design

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  1. Equipment Design Done By: Lamya AL-Hussaini

  2. Distillation Column Distillation column is used to separate components according to their boiling point temperature. The objective of this distillation is to separate styrene from water and ethylbenzene

  3. Assumptions: • Sieve plate. • Material of the distillation is carbon steel. • Plate spacing= 0.6 m • Efficiency = 50% • Flooding % = 85% • Weir height = 50 mm • Hole diameter = 5 mm • Plate thickness =5 mm

  4. Design Procedure: • Number of stages: • Nm= Where , From Antoine equation:

  5. Xl = mole fraction of light component (ethylbenzene) Xh = mole fraction of heavy component (styrene) Actual Number of stage = Nm/ efficiency Nm = 5 Efficiency = 50% Actual number of stages =10 stages

  6. 2)Column Diameter: D = (Ad *4/π)^0.5 Where: Ad: down comer area, m2 Ad = An/(1-.12) Where: An: Net area required, m2 An = Mmax/uv Mmax= mass flow rate /density uv = uf*.85 where 85 flooding %,uv maximum vapor velocity uf= K ((ρL- ρv)/ ρv) ^0.5 where uf flooding vapor velocity Column Diameter, TOP= 1.7m BOTTOM= 6.2m

  7. 3) Column Height : H= (Tray spacing * actual NO. stage ) + D H = 12.2 m 4) Maximum volumetric liquid rate: MVL =(Lbottom*Mwt)/(3600* ρL) MVL =0.4

  8. 5) Plate Design : (π/4)*D^2 0.12*Ac Ac= 30.25 m2 Aa =22.9 m2 Ad =3.63 m2 Ah =2.3 m2 An = 26.63 m2

  9. 6) Residence Time: tr= Where, tr: downcomer residence time (S) hb: downcomer back-up (m ) Ad=downcomer area (m2) ρL: liquid density (kg/m3) tr = 8.25 s

  10. 7) Number of holes: Area of one hole = (π/4)*(hole diameter^2) Total number of holes = Ah / area of one hole Holes on one plate = total Number of holes/number of stages Area of one hole = 1.96E-5 m2 Total number of holes =117119 Holes on one plate = 11712

  11. 8) Thickness Calculations: Thickness = [(ri* P)/(Ej *S-0.6P)]+Cc ri = Inside radius of the shell, in P =Maximum allowable internal pressure(psi) S = Maximum allowable working stress(13700 psi) EJ = Efficiency of joints (0.85) Cc = Allowance for corrosion, in (0.125 in) Thickness = 0.2948 in Thickness= 7.48 mm

  12. 9) Area of condenser and Reboiler: Area of condenser& reboiler = Q/(U*∆T) Where: Q: Heat transfer (W) ∆T: Temperature difference.(°C) U: overall heat transfer coefficient(W/m2.°C) Area of condenser =454216 ft2 Area of reboiler = 7010.79 ft2

  13. 10) Cost Calculations : $ $ $ Total cost = 365200 $

  14. Distillation Column

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