Gas Absorption Experiment performed in lab during my Junior year at Drexel University.

1. Gas Absorption Experiment By Diego Paranhos Lab Partners: Tom Henderson & Anhtuyet Lam

3. Theory

4. Equipment / Schematic

5. Procedure

6. Calculations

7. Results & Discussion

8. Conclusion

9. Recommendations

10. References

12. Composition

13. Liquid Flow Rate

14. Gas Flow Rate

15. Chemical and Physical Absorption

16. Temperature

18. Theory C* = Liquid Phase Concentration of CO2 in equilibrium with the gas C = Liquid Concentration of CO2 [mol/L]

19. Theory Enhancement

20. EquipmentGas Absorption System

21. Schematic

22. Equipment Titration System

23. Schematic

24. Procedure Part I – Physical Gas Absorption (Using water only) Fill the bucket with water. Turn the apparatus on, the pump, CO2and air supply valves. Using the control panel, make the flowrate of CO2 to air 50/50. Vary the water flowrate: 4 L/min, 8 L/min, and 12 L/min. Prepare a 600 mL beaker with 5cc of NaOH (0.1M) using a pipette and 3-5 drops of phenolphthalein. Weigh it. After each flowrate, collect effluent from bottom, using the beaker. Enough to make phenolphthalein/NaOH/effluent solution light pink. Reweigh it. Take the beaker with the effluent to the titrator. Set to titrate to pH 8.5. Then again to pH 4.0 Repeat steps 3 though 7for CO2/air flowrates of 75/25 and 25/75 varying the water feed flowrate. (Total of 9 runs)

25. Procedure Part II A – Chemical Gas Absorption (Using NaOH aqueous solution) Using 2 buckets; pour 16 liters of water in one and 8 liters in the other. Add 160 grams of NaOH to the 16-liter bucket and 80 grams of NaOH to the 8-liter bucket. Stir both buckets for a uniform concentration. Pour some of the 16 liters into the 8 liters, and vice-versa, for an equal concentration in both buckets. Pour this NaOH/water solution into the bucket behind the apparatus. Repeat procedure from Part I except do not add 5cc of NaOH to solution with phenolphthalein. Just the phenolphthalein is okay.

26. Procedure Part II B – Chemical Gas Absorption (Using NaOH aqueous solution with Heater) Using the remaining NaOH solution from Part II A, turn the pump off. Turn the heater on. Wait until the temperature reaches 50°C. Once it does, turn pump on, and repeat procedure for only 50/50 CO2 and air.

27. Calculations

28. Calculations

29. Calculations Enhancement

30. Results & DiscussionPhysical Absorption ~ 0.002-0.003 mol/s

31. Results & DiscussionChemical Absorption ~ 0.010-0.014 mol/s

32. Results & DiscussionPhysical Absorption ~ 5.00E-5 mol/s

33. Results & DiscussionChemical Absorption ~ 5.00E-3 mol/s

34. Results & DiscussionChemical Absorption w/ Heater ~ 1.00E-2 mol/s

35. Results & DiscussionEnhancement

37. Absorption better when using higher flowrates of liquid and higher concentration of CO2.

38. Enhancement always greater than 1.

40. Hard to access bucket with liquid

41. Move to front would have given easier access

42. Time constraint

44. Thank You

45. Questions?