MolecularSieve

class MolecularSieve(ID='', ins=None, outs=(), thermo=None, **kwargs)

Create an ethanol/water molecular sieve for bioethanol plants. The molecular sieve is modeled as a component wise separator. Costing is based on scaling by the 6/10ths rule from an NREL TEA report [1].

Parameters:

• ins (Sequence[Stream | str], optional) –

  • [0] Feed (gas)

• outs (Sequence[Stream | str], optional) –

  • [0] Split stream (gas)

  • [1] Remainder stream (gas)

• split (array_like) – Componentwise split to the 0th output stream

Examples

>>> from biosteam import Stream, settings
>>> from biosteam.units import MolecularSieve
>>> settings.set_thermo(['Water', 'Ethanol'], cache=True)
>>> feed = Stream('feed', flow=(75.7, 286), T=351.39, phase='g')
>>> bp = feed.bubble_point_at_T()
>>> feed.T = bp.T
>>> MS1 = MolecularSieve('MS1', ins=feed,
...                      outs=('ethanol_rich', 'water_rich'),
...                      split=dict(Water=0.160,
...                                 Ethanol=0.925))
>>> MS1.simulate()
>>> MS1.show(T='degC', P='atm', composition= True)
MolecularSieve: MS1
ins...
[0] feed
    phase: 'g', T: 78.24 degC, P: 1 atm
    composition (%): Water    20.9
                     Ethanol  79.1
                     -------  362 kmol/hr
outs...
[0] ethanol_rich
    phase: 'g', T: 78.24 degC, P: 1 atm
    composition (%): Water    4.38
                     Ethanol  95.6
                     -------  277 kmol/hr
[1] water_rich
    phase: 'g', T: 78.24 degC, P: 1 atm
    composition (%): Water    74.8
                     Ethanol  25.2
                     -------  85 kmol/hr

>>> MS1.results()
Molecular sieve                  Units       MS1
Electricity         Power           kW      14.2
                    Cost        USD/hr      1.11
Low pressure steam  Duty         kJ/hr  3.21e+06
                    Flow       kmol/hr        83
                    Cost        USD/hr      19.7
Cooling water       Duty         kJ/hr -1.18e+05
                    Flow       kmol/hr      80.9
                    Cost        USD/hr    0.0395
Design              Flow rate    kg/hr  2.13e+03
Purchase cost       Column         USD  6.85e+05
Total purchase cost                USD  6.85e+05
Utility cost                    USD/hr      20.9

References

[1]

Process Design and Economics for Biochemical Conversion of Lignocellulosic Biomass to Ethanol Dilute-Acid Pretreatment and Enzymatic Hydrolysis of Corn Stover. D. Humbird, R. Davis, L. Tao, C. Kinchin, D. Hsu, and A. Aden (National Renewable Energy Laboratory Golden, Colorado). P. Schoen, J. Lukas, B. Olthof, M. Worley, D. Sexton, and D. Dudgeon (Harris Group Inc. Seattle, Washington and Atlanta, Georgia)

line: str = 'Molecular sieve'

class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class

run()

Run mass and energy balance. This method also runs specifications user defined specifications unless it is being run within a specification (to avoid infinite loops).

See also

_run, specifications, add_specification, add_bounded_numerical_specification