Distillation - Principles of Chemical Separations with Environmental Applications - page 117

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Data file created by ASPEN PLUS Rel. 9.1-3 on 14 : 18 : 16 Thu Sep 14, 1995
Run ID: HNO3SN-_ Item: STREAM-SUM Screen: Stream-Sum.Main
C-----------------C-----------------C-----------------C-----------------C-----------------C-----------------C-----------------

Display ALLSTREAMS B-1 D-1 F-1 F-2 V-1

Units: ____________ From B1 B1 _________ B2 B2

Format: ELEC-M To ________ ________ B2 B1 _________

Phase LIQUID LIQUID LIQUID LIQUID MIXED

Temperature [K] 388.7 366.6 298.1 371.6

Pressure [ATM] 0.9 0.8 0.8 0.8 0.8

Vapor Frac 0.000 0.000 0.000 0.000

Solid Frac 0.000 0.000 0.000 0.000

Mole Flow [KMOL/HR] 0.737 2.442 3.179 3.179 0.000

Mass Flow [KG/HR] 24.089 43.998 68.087 68.087 0.000

Volume Flow [L/MIN] 0.320 0.762 1.000 1.041 0.000

Enthalpy [MMKCAL/HR] − 0.043 − 0.164 − 0.212 − 0.208

Mass Flow [KG/HR] _________ __________ __________ __________ ____________

H2O 8.396 43.996 52.932 52.932

HNO3 25.153 0.002 15.155 15.255

H3O+
NO3 −

OH−

Display ALLSTREAMS __________

Units: ___________ From __________

Format: ELEC-M To __________

Phas __________

Temperature [K] ____________

Pressure [ATM] ____________

Vapor Frac ____________

Solid Frac ____________

Mole Flow [KMOL/HR] ____________

Mass Flow [KG/HR] ____________

Volume Flow [L/MIN] ____________

Enthalpy [MMKCAL/HR] ____________

Mass Flow [KG/HR] ____________

H2O ____________

HNO3+ ____________

H3O+ ____________

NO3−
OH

____________
____________ −

Figure 4.24 Aspen Plus printout [3]. Refer to flowsheet schematic, Figure 4.22,
Example 4.6.

4.3 If a distillation column loses heat to the environment (non-adiabatic operation), how
would that affect the separation?
4.4 If the operating line was not a straight line on a McCabe-Thiele plot, could you still
use the methodology to determine the number of equilibrium stages? Justify your
answer.
4.5 As the relative volatility decreases in value, does R D increase or decrease for a given
separation? How does that affect the heat requirement for the column?
4.6 Why is it reasonable to assume that a partial reboiler is always an equilibrium stage?