Fractionation Column Calculation

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    SIZING COLUMN DISTILATION (based on GPSA - Detailed Method)

    INPUT DATA5.06 lb/ft3

    Vapor Mass rate 10460.00 lb/hr

    Vapor Vol. rate 2065.97 ft3/hr

    47.31 gpmLiquid density 24.14 lb/ft3

    Liquid surface tension, 1.399 dyne/cm

    12 inch

    CALCULATION

    A Calculate System Factor based on Fig. 19.15

    system factor 0.72

    Vapor Density

    Liquid rate

    tray spacing,

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    B Calculate the downcomer velocity (VDdsg) based on Fig. 19-16

    Tray spacing 12 inch

    rL - rV 19.077 lb/ft3

    VD*dsg 115 gpm/ft2

    VDdsg= VD*dsg x system factor82.81 gpm/ft2

    C Calculate the vapor capacity factor (CAF) based on Fig. 19.17

    rV 5.063 lb/ft3

    tray spacing 12 inch

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    CAFo 0.27 ft/s

    CAF= CAFo x system factor

    0.19 ft/s

    C Calculate the tray active area (AAM)

    Vload 0.30 ft3/s NP 1

    Dt 2

    GPM 47.308387 gpm FPL 18

    CAF 0.19 ft/s

    FF 0.82 Flooding Factor (commonly used is 0.82 for most syste

    AAM 2.27 ft2

    D Calculate the tray downcomer area (ADM)

    ADM 0.70 ft2 ok

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    Check: if ADM is less than 11% of AAM, use 11% of AAM or double ADM, whicever is small

    11% AAM 0.25 ft2

    E Calculate the diameter of column (Dt)

    ATM (1) 3.66 ft2 ATM (2) 2.38 ft2

    Dt (1) 2.16 ft Dt (2) 1.74 ft

    Dt selected 2.16 ft

    F Height of Column Required (H)

    21 HYSYS

    Tray Efficiency 80% Assumption

    Actual Tray 26

    25

    Tray Spacing 1.00 ft

    Top Section 5 ft Commonly 5-10 ft is sufficie

    Bottom Section 4 ft

    34.25 ft

    RESULT PARAMETER result

    ID 2.16 ft= 660 mm H/ID 16

    H 34.25 ft= 10450 mm H 34

    G Nozzle Sizing

    LocationMass Rate,

    lb/hrDensity,lb/ft3

    Vol. Rate,

    ft3/h ID Pipe, inch

    Actual

    Velocity, ft/s

    Actual rho-

    v2

    Feed Inlet 3715.07 9.217708572 403 2 1.75 28

    Liquid Outlet 11940.326 24.39749223 489 2 2.12 110

    Vapor Outlet 4803.2009 3.199174364 1501 2 6.50 135

    Reflux Inlet 2886.5702 28.60986633 101 2 0.44 5Reboiler Inlet 10141.886 5.145151558 1971 2 8.54 375

    H Bottom Level Setting

    Interval Level, inch

    Total Volume,

    ft3

    Hold-up

    Time, minin. Level, inc

    Min. Hold-up

    Time, minCriteria

    LLLL-BOV 12 43.91 7 12 OK

    LLL-LLLL 6 21.95 3 6 1 OK

    Theoritical Tray

    space inter Tray

    Heigh of Column

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    NLL-LLL 6 21.95 3

    HLL-NLL 6 21.95 3

    HHLL-HLL 6 21.95 3 6 1 OK

    Total 36

    Min. height of bottom sectio 3 ft

    12 3 OK

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    Hysys

    Hysys

    HysysHysys

    Hysys

    Assumption

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    pass tray assumption

    ft Fig. 19.14

    ft

    m)

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    r.

    t for disengaging purpose

    Criteria

    max. 20

    175

    .

    Velocity,Max. rho-

    v2Criteria

    4000 OK

    3 OK

    60 2500 OK

    4000 OK4000 OK

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