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    08 Hydrocracking Example PDF

    Uploaded by

    Ashwani Kumar

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    08 Hydrocracking Example PDF

    Uploaded by

    Ashwani Kumar
    79 views17 pages

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    08_Hydrocracking_Example.pdf

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    79 views17 pages

    08 Hydrocracking Example PDF

    Uploaded by

    Ashwani Kumar

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    You are on page 1of 17

    Use of Yield Charts & Equations

    Volume Mass Density Ave BPT Watson K


    Hydrogen
    For cracking 
    Sulfur 2 mol/mol S
    Dissolved in 
    1 lb/bbl feed
    product
    H2S Sulfur in Feed

    C3‐ 1.0+0.09*(YLN)

    IC4 0.377*(YLN) Calculate Pure

    NC4 0.186*(YLN) Calculate Pure

    C5 to 180F Fig. 7.3 (YLN) Calculate Calculate 131F Fig. 7.5

    180 to 400F Fig. 7.4 Calculate Calculate 281F Fig. 7.5

    400F+  Calculate 460F Fig. 7.5

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Trends

    Figure 7.3
     The lighter the feedstock the 
    more readily it cracks
     The curves for the 10.9 Watson K 
    factor feed are about 10% lower 
    than the curves for the 12.1 
    Watson K factor feed. 
    • Suggests the calculation 
    procedure:
      K  12.1  
    Y  YKW 12.1 1  0.1  W 
      10.9  12.1  

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Trends

    Figure 7.4
     Start over‐cracking the heavy 
    naphtha fraction when the light 
    naphtha yields gets above 25 
    vol%.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield – Makeup Hydrogen

    Make up hydrogen must be added to compensate for that 
    chemically consumed & any dissolved in the liquid products
     Primary hydrogen consumed will be to saturate aromatics & olefin 
    structures and break C‐C bonds
     Additional hydrogen needed for the removal of sulfur
    • Breaking of the C‐S‐C and C‐SH bonds
    • Assume the more conservative 2 mol H2 per mol S
     Liquid products leave with dissolved H2
    • Text book recommends 1 lb H2 per bbl liquid product

    Updated: July 12, 2018
    4
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Estimate the Watson K factors 
    for the liquid products

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Calculate other values based on 
    the physical property 
    information & flow data.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine amount H2S 
    produced & amount of H2
    required to remove

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine Vol% Light Naphtha 
    Yield (based on 12.1 Watson K 
    factor feed).

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Correct to actual Watson K 
    factor of feed. Calculate 
    associated mass values.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine Vol% Heavy Naphtha 
    (180 to 400oF) Yield. Calculate 
    associated mass values.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine Vol% Butane Yield. 
    Calculate associated mass 
    values.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine Wt% C3‐ Yield. Split 
    between C1, C2, & C3.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine mass amount of 
    Distillate & residual Gas Oil 
    (400oF+) based on total mass 
    balance.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine all other yield 
    amounts.

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Determine the amount of 
    dissolved H2 in the liquid 
    products (C3 & heavier)

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)
    Hydrocracker Yield Example

    Updated: July 12, 2018
    Copyright © 2017 John Jechura (jjechura@mines.edu)

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