influence of liquid properties on effective mass transfer area of structured packing

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Influence of Liquid Properties on Effective Mass Transfer Area of Structured Packing. Robert E. Tsai January 11, 2008. Research Review Meeting Department of Chemical Engineering The University of Texas at Austin. Overview. Introduction: Motivation & Objectives Materials and Methods - PowerPoint PPT Presentation

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  • Influence of Liquid Properties on Effective Mass Transfer Area of Structured PackingRobert E. TsaiJanuary 11, 2008Research Review MeetingDepartment of Chemical EngineeringThe University of Texas at Austin

  • OverviewIntroduction: Motivation & ObjectivesMaterials and MethodsPilot-scale packed columnWetted-wall column (WWC)Experimental ResultsReduced surface tensionEnhanced viscosityConclusions

  • Importance of Mass Transfer AreaPacking: promotes gas-liquid mass transferRandom: less $$Structured: lower P, better mass transfer, cleaner mechanics Need for reliable mass transfer models (kL/kG, ae)Measured performance: kLae or kGaeFor industrial CO2 capture (amine absorption), ae particularly importantAbsorption rate independent of MTCs but remains directly related to ae

  • Research MotivationNo ae models predictive over range of conditionsDifferent effects of viscosity and surface tensionae = f(,) water data may not be reflective of amine conditions!

  • Project ScopeMeasurement of ae of Mellapak packings (250 and 500-series)Fluid property variationsViscosity (1, 5, 10 cP)Surface tension (72, 50, 30 dynes/cm)Geometric variationsKinetic measurements (WWC)Test impact of additives on CO2-NaOH rxn.Semi-empirical modelPredicts ae of sheet-metal packing as function of viscosity, surface tension, liquid load

  • Separations Research Program (SRP) DatabaseCO2 absorption from air into 0.1 M NaOHMeasured in 16.8 (430 mm) ID column10+ random packingsCMR #2, IMTP #4010+ structured packingsMellapak 250Y, Flexipac 1YHydraulic measurements (P, holdup)

  • Caustic Absorptionae measured by CO2-NaOH reactive absorptionInexpensive and non-hazardousKinetics have been extensively characterized Overall rxn: CO2 (aq) + 2 OH- CO32- + H2O

    Pseudo-first-order (low PCO2, excess OH-):

    (Irreversible)

  • Packed Column SetupAir OutletStorage TankLiquid PumpPacking ~ 10 ft (3 m)Blower (Air: 380-400 ppm CO2)Distributor, DemisterDPCOptional Recycle(for mixing)PVC: ID ~ 16.8 (430 mm)(Up to 35 gpm/ft2 or 85 m3/m2-h)300 or 450 ACFM(1 or 1.5 m/s)

  • Packing Area CharacterizationSeries resistance:1/kG 0 for high gas velocity, dilute NaOH

  • Mass Flow ControllersSolutionReservoirSeptumTemp.BathPumpNeedle ValveN2 / CO2N2Bypass Valve

    GasIN

    LiqIN

    LiqOUT

    GasOUT

    CondenserSaturator / Temp. BathWWCCO2 Analyzer (IR)WWC Experimental SetupyCO2: 500 1500 ppm(minimize OH- depletion)Liq. Rate: 2-4 cm3/s(constant)(5 SLPM)

  • WWC CalculationsExperimental kg:Pohorecki and Moniuk (1988): Eqns for kOH-, DCO2 liq, HCO2CO2 fluxCorrelated via SO2-NaOH absorptionLiterature kg:

  • Reduced Surface Tension Studies

  • Data

    Base caseNP-7 / Antifoam

    9/26/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.295210.081.049274.41

    1.102233.181.082254.24

    1.028254.791.051293.33

    0.994275.101.127233.05

    0.993294.021.335209.84

    10/2/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.089142.021.043310.86

    1.218188.001.134141.61

    1.146252.901.118253.18

    1.124309.771.116189.02

    1.306341.401.149343.61

    10/4/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.078142.040.934143.22

    1.253187.551.091189.2303897217

    1.284250.981.130252.9014620789

    1.184308.671.043310.8191110976

    1.227342.251.045345.26

    10/5/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.072142.081.000142.67

    1.186188.261.130188.82

    1.143252.801.093253.43

    1.049310.831.114309.76

    1.093344.561.106344.26

    11/1/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.175157.96797828331.138284.42

    1.137193.95909049941.148193.98

    1.188241.04171499981.127241.92

    1.164283.88984239870.941159.91

    1.082328.61028097391.128328.02

    11/2/06

    Normalized kg'PCO2 LM(Pa)Normalized kg'PCO2 LM(Pa)

    1.340156.82599433861.139194.11

    1.168193.76596294931.180284.13

    1.060242.73253837111.150328.30

    1.069285.44446917211.131242.41

    1.098328.47353040711.061159.36

    Average1.14Average1.10100

    STDEV0.0914153944STDEV0.0738521773400

    Plot

    1.29521646321.0490576021.14483696541.1011057088

    1.14483696541.1011057088

    1.10209725981.082375023

    1.02828713631.0506394764

    0.99409983991.1270198675

    0.99264826651.3353568457

    1.08916530811.0433938816

    1.21763098451.1339065793

    1.14551199081.1177800483

    1.12428833121.1164470274

    1.30553319251.1492554516

    1.07844760230.9343092937

    1.25306801131.0905337638

    1.28442876141.1297518528

    1.18356324211.0430749914

    1.22737509431.044555254

    1.072163740.9997748239

    1.18600060011.1296084216

    1.14291040271.0931816451

    1.04926223131.1143733024

    1.09321420031.1057093105

    1.17509267581.1379355333

    1.13680920491.1481428918

    1.18806941651.1273375231

    1.16358173130.9411076578

    1.08186364011.128150753

    1.34022169751.1385044244

    1.16813072771.1798091435

    1.06013661441.149952758

    1.06854483911.131440192

    1.09774575721.0606859243

    Baseline average

    NP-7 / antifoam average

    (125 ppmv TergitolTM NP-7 / 50 ppmw/v Dow Corning Q2-3183A antifoam)

    Baseline ( ~ 72 dynes/cm)

    NP-7 / antifoam ( ~ 35 dynes/cm)

    Base case average

    NP-7 / antifoam average

    PCO2 LM (Pa)

    Normalized kg

    WWC Data for Baseline & Low Surface Tension Systems

    Sheet3

  • Data

    Mellapak 250Y (0511) - baseline

    F10 distributor

    packed height114.25inches

    surface area/volume250m2/m3

    INPUT DATA

    Water FlowAir FlowPressure DrpSump LevelAir PressAir InWater InAir OutAir AnnubarCO2 InCO2 Out[OH] ConcentrationAir FlowCorrectedKOGANTUOGHTUOGK'GEffective AreaEffective Areafractional area

    FT901FT900PDT901LT900PT900T900T901T902TT404FI900Temperature

    run #timegpm/ft2m3/m2-hr(ACFM)(in H2O)(in)(PSIG)(F)(F)(F)(F)ppmppmNlb/hr-ft2Fs-1ftm2/m3ft2/ft3F

    110/31/05 16:454.9612.13301.60.4911.990.0961.2969.9466.6260.353862190.1060895.1966.953.260.1940.56516.8374.08E-05195.4959.580.78

    210/31/05 16:589.9924.42300.90.5612.650.0961.0968.7265.1859.463862120.1020893.8065.933.260.2050.59915.8823.96E-05214.0365.240.86

    310/31/05 17:1214.9936.65301.30.7713.950.1061.3967.8164.2860.083862050.1000894.8165.323.260.2160.63115.0773.89E-05229.9270.080.92

    410/31/05 17:2220.0148.93300.81.5015.490.1362.1167.2863.9861.743862020.0950893.7965.163.260.2210.64714.7193.77E-05242.6773.970.97

    510/31/05 17:3429.9973.31301.15.2918.700.2662.7366.9763.7461.053861860.0930901.5765.103.260.2500.73113.0303.72E-05278.0584.751.11

    18/17/05 10:104.9812.17450.41.0010.790.1186.0383.0590.1689.863832350.10201277.8685.584.870.2490.48719.5624.76E-05206.2862.870.83

    28/17/05 10:2710.0124.47449.71.1211.340.1186.7682.1791.2989.263832270.09901274.6885.604.870.2680.52418.1644.68E-05225.3368.680.90

    38/17/05 10:4515.0136.70449.81.3312.600.1288.5481.9591.2290.343832210.09771271.5185.924.870.2810.55017.3014.66E-05237.7872.480.95

    48/17/05 11:0020.0048.90448.61.9714.210.1591.0882.0390.6692.433832140.09691264.2986.454.850.2960.58016.4044.66E-05250.3276.301.00

    58/17/05 11:1525.0061.12448.52.7116.300.1792.2182.3889.6193.173832100.09531263.8386.644.850.3070.60215.8104.62E-05262.2379.931.05

    68/17/05 11:3030.0073.33449.64.4718.170.2493.4482.6586.2292.373832090.09441269.3586.244.870.3090.60415.7714.58E-05267.5481.551.07

    78/17/05 11:4635.0085.56449.49.1618.110.4095.4283.0586.9192.583831980.09231277.9787.114.860.3380.66114.4104.56E-05293.7689.541.18

    Montz B1-250 (0203)

    packed height123.25inches

    surface area/volume250m2/m3

    INPUT DATA

    Water FlowAir FlowPressure DrpSump LevelAir PressAir InWater InAir OutAir AnnubarCO2 InCO2 Out[OH] ConcentrationAir FlowCorrectedKOGANTUOGHTUOGK'GEffective AreaEffective Areafractional area

    FT901FT900PDT901LT900PT900T900T901T902TT404FI900Temperature

    run #timegpm/ft2m3/m2-hr(ACFM)(in H2O)(in)(PSIG)(F)(F)(F)(F)ppmppmNlb/hr-ft2Fs-1ftm2/m3ft2/ft3F

    17/11/02 16:2538.5394.20448.712.140.20110.7883.8686.183742050.07701225.5491.174.860.2830.59917.1434.41E-05254.4377.551.02

    27/11/02 16:3629.7872.79447.56.580.12107.7083.8186.583742090.07501221.9390.484.840.2740.58017.7004.32E-05251.1076.541.00

    37/11/02 16:4319.8248.45447.11.780.04104.3483.7388.883742180.07301222.0390.174.840.2550.54118.9794.23E-05237.4872.380.95

    47/11/02 16:529.8524.09451.51.280.03103.5983.8492.233742250.07101234.9590.884.890.2410.50720.2544.19E-05225.6168.770.90

    57/11/02 17:025.0012.23450.41.150.03102.8884.1993.593742310.06901233.3091.214.870.2280.48121.3754.18E-05213.2064.980.85

    67/11/02 17:130.932.28446.91.040.03101.4484.0092.713742390.06701226.9190.544.840.2100.44623.0284.08E-05201.4761.410.81

    Mellapak 250Y (0622) - surfactant

    F10 distributor

    packed height123inches

    surface area/volume250m2/m3

    Water FlowAir FlowPressure DrpSump LevelAir PressAir InWater InAir OutAir AnnubarCO2 InCO2 Out[OH] ConcentrationAir FlowCorrectedKOGANTUOGHTUOGK'GEffective AreaEffective Areafractional area

    FT901FT900PDT901LT900PT900T900T901T902TT404FI900Temperature

    run #timegpm/ft2m3/m2-hr(ACFM)(in H2O)(in)(PSIG)(F)(F)(F)(F)ppmppmNlb/hr-ft2Fs-1ftm2/m3ft2/ft3F

    110/23/06 14:101.002.44300.50.4613.490.0377.4273.7575.3175.004122500.1000861.2775.063.250.1580.49820.6004.27E-05149.6345.610.60

    210/23/06 14:225.0112.25300.70.5313.400.0376.8570.5176.3474.764122070.0938863.0773.553.250.2190.68814.8884.06E-05217.4666.280.87

    310/23/06 14:3910.0024.44301.71.1813.660.0576.5568.3676.8974.464122040.0935867.7272.543.260.2240.70314.5744.01E-05225.0368.590.90

    410/23/06 14:5515.0036.67298.73.23

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