Page 307 - Chemical engineering design

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CHEMICAL ENGINEERING
4. Condenser: shell and tube heat exchanger, fixed tube sheets, heat transfer area
2
25 m , design pressure 2 bar, materials stainless steel.
5. Absorption column: packed column, diameter 0.5 m, height 6.0 m, packing
height 4.5 m, packing 25 mm ceramic saddles, design pressure 2 bar, material
carbon steel.
6. Extraction column: packed column, diameter 0.5 m, height 4 m, packed height
3 m, packing 25 mm stainless steel pall rings, design pressure 2 bar, material
carbon steel.
7. Solvent recovery column: plate column, diameter 0.6 m, height 6 m, 10 stain-
less steel sieve plates, design pressure 2 bar, column material carbon steel.
8. Recover column reboiler: thermosyphon, shell and tube, fixed tube sheets,
2
heat transfer area 4 m , design pressure 2 bar, materials carbon steel.
2
9. Recovery column condenser: double-pipe, heat transfer area 1.5m ,design
pressure 2 bar, materials carbon steel.
2
10. Solvent cooler: double pipe exchanger, heat transfer area 2 m , materials
stainless steel.
2
11. Product purification column: plate column, diameter 1 m , height 20 m, 15
sieve plates, design pressure 2 bar, materials stainless steel.
2
12. Product column reboiler: kettle type, heat transfer area 4 m , design pressure
2 bar, materials stainless steel.
13. Product column condenser: shell and tube, floating head, heat transfer area
2
15 m , design pressure 2 bar, materials stainless steel.
14. Feed compressor: centrifugal, rating 750 kW.
3
15. Butanol storage tank: cone roof, capacity 400 m , material carbon steel.
16. Solvent storage tank: horizontal, diameter 1.5 m, length 5 m, material carbon
steel.
3
17. Product storage tank: cone roof, capacity 400 m , material carbon steel.
Raw materials

1. 2-butanol, 1.045 kg per kg of MEK, price £450/t ($750/t).
2. Solvent (trichloroethane) make-up 7000 kg per year, price 60p/kg. ($1.0/kg).
Utilities
Fuel oil, 3000 t per year
Cooling water, 120 t/hour
Steam, low pressure, 1.2 t/h
Electrical power, 1 MW
The fuel oil is burnt to provide flue gases for heating the reactor feed and the
reactor. The cost of the burner need not be included in this estimate. Some of
the fuel requirements could be provided by using the by-product hydrogen. Also,
the exhaust flue gases could be used to generate steam. The economics of these
possibilities need not be considered.
6.11. A plant is proposing to install a combined heat and power system to supply
electrical power and process steam. Power is currently taken from a utility
company and steam is generated using on-site boilers.