Dr Colin Hare Chemical Engineering Programmes, Faculty of Engineering and Physical Sciences ENG2109 – Transfer Processes: Absorption Column Design Coursework Submission Deadline: 4pm on Monday 30th...

a) Determine the fraction of CO₂in the liquid stream leaving the column and evaluate the height and diameter of the column required for each choice of packing.

b) Assess the operating and flodding pressure drop for each packing arrangement and recommend a packing size for the operation?

Dr Colin Hare Chemical Engineering Programmes, Faculty of Engineering and Physical Sciences ENG2109 – Transfer Processes: Absorption Column Design Coursework Submission Deadline: 4pm on Monday 30th April 2018 Submission Format: to be completed individually OR as a group of up to four people. For groups, only one student should submit, with a declaration page attached which names the contributors to the submission, this page should be signed and dated by all contributors. The completed assignment should be submitted as a pdf file with a completed coversheet and your answers in the relevant folder in Surrey Learn. An absorption column is required to remove CO2 from a 200 kmol/hr flue gas stream using aquaeous monoethanolamine (MEA) at a flow rate of 710 kmol/hr. The gas feed to the bottom of the column contains 12 mole% CO2 in air, and the exhaust gas stream from the column should contain no more than 0.5 mole% CO2. The MEA fed to the top of the column is taken from a regeneration column and contains 2 mole% CO2. Packing in the form of ceramic raschig rings are available in sizes from 0.5 to 3 inches, the column should be designed for a pressure drop of 0.25 inches H2O per foot of packing. a) Determine the fraction of CO2 in the liquid stream leaving the column and evaluate the height and diameter of the column required for each choice of packing. [60%] b) Assess the operating and flooding pressure drop for each packing arrangement and recommend a packing size for this operation? [20%] c) Sketch the chosen column arrangement. [10%] Marks for clear and professional presentation of your work (pro rata of the work done) [10%] Equilibrium data: x 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 y 0.001 0.002 0.0035 0.006 0.01 0.015 0.022 0.032 Packing data: Nominal size (in) 1/2 5/8 3/4 1 1 1/2 2 3 Packing factor, F (ft-1) 580 380 225 179 93 65 37 Interfacial area, a (m2/m3) 111 100 80 58 38 28 19 ΔPflooding = 0.12 F0.7 where ΔPflooding is in inches H2O/ft of packing and F is in ft-1 Other data: kOG = 0.8 mol.m-2.s-1 ρl = 1000 kg.m-3, ρg = 1.05 kg.m-3, μ = 0.6 Pa.s, η = 0.05 cSt, �̅�MEA solution = 22.3 g/mol Important: Indicate clearly, but succinctly, the procedure that you have followed to obtain the results. The total length of the written text is not expected to exceed 1000 words. Produce clear and professional diagrams, whenever relevant. Double-check that your solution can be verified with “Turn It In”. Solutions that cannot be verified on Turn It In (e.g. handwritten or scanned as an image) will be strongly penalised. Tip: You may wish to use Excel to solve this coursework. If you do, describe carefully all the equations solved and summarise key results.