Discussion0112AspenIntro SimpleVLE 8.0

8/17/2019 Discussion0112AspenIntro SimpleVLE 8.0

http://slidepdf.com/reader/full/discussion0112aspenintro-simplevle-80 1/21

Qualitative Behavior of Vapor-

Liquid Equilibria and SimpleCalculations using

ASPEPL!S V"#$

EC% &'(B )iscussion

*anuar+ &(, (&'



./o Species

.+pical E$amples0 Salt in 1ater, heptane and octane 2gasoline3,

ethanol in /ater 2/ine, beer etc3



Phase 4ule /ith t/o species

at least one phase

5n the t+pical pure liquid phase /e have three degrees of freedom

e#g# T 2.emperature3, p 2pressure3, x 1 2concentration3,

/ith one phase boundar+ 2vapor 6 liquid3 /e have t/o degrees of freedom

π π −=+−= 42 C N F

1≥π



7ne Phase Boundar+

An iceberg is a t+pical ( phase

( component s+stem, if it is not in

a fresh /ater la8e#

Salt 9 1ater



Pressure composition diagrams

Vapor

Vapor

Liquid

Liquid

more volatile : easier to vapori;e,fi$ed ., so one more degree of <reedom



β

=oving through VLE P->



.emperature - Composition

Ben;ene-toluene

)e/ Line

2saturated vapor3

Bubble Line

2saturated liquid3

Pressure fi$ed



5nfluence of Pressure on T-x-y

&

Critical Points

Bubble Line

2saturated liquid3

)e/ Line2saturated vapor3

5ncreasing Pressure



A;eotropes 2onl+ non-ideal3

&

Bubble Line

2saturated liquid3

)e/ Line2saturated vapor3

a;eotrope



!sing Aspen Plus? V "#> to

calculate .-$+ and p-$+diagrams

• 7pen Aspen.ech-

@Process=odeling"#$-

@AspenPlus-@AspenPlus

V8.X

• 5 am using "# in thee$amples here#



!sing Aspen Plus? to calculate

.-$+ and p-$+ diagrams

• Close Start Page



!sing Aspen Plus? " to

calculate .-$+ and p-$+diagrams

• <ile-@e/

• Blank Simulation

• Create



.hen it should loo8 li8e this



Start /ith setting the units

• %ome -@ Setup -@ lobal

• Standard0 Bar and Celsius 2=E.CBA43

•

ou ma+ /ant to s/itch to S5



!sing Aspen " to calculate .-$+

and p-$+ diagrams• 7n Home Screen o to

Components->Specifications

• Add +our component 2best to search b+ name or

formula under component name3• =a8e sure +our Component ID is not empt+,

best +ou cop+ the name there



!sing Aspen? " to calculate

.-$+ and p-$+ diagrams• Close Component Specifications 1indo/

• o to Meto!s -> Specification

•

Choose +our Base Meto! 2e#g# 5deal for4aoults la/3



!sing Aspen? " to calculate

.-$+ and p-$+ diagrams• Close Specifications 1indo/

• o to Binar" 2top line in Anal"sis bloc83

25f +ou cannot select it +ou missed

something earlier, e#g# interaction

parameters3



!sing Aspen Plus? to calculate

.-$+ and p-$+ diagrams• <or Vali! Pases

Select Vapor-#i$ui!

• Select Anal"sis

%"pe 2%&" or P&"3

• Enter Conditions

2P or ., be/are ofunits upi selected

earlier3

• 'un Anal"sis



.-$+ diagram 2at ambient p3 for

Ben;ene .oluene 25deal3



=ore 5nfo

• 5nstead of one condition +ou can add a

range and increments

• .he program also gives +ou a table from

/hich +ou can cop+ the data



E$amples to tr+

• Ben;eneD.oluene 2#& =Pa or F3

• Ben;ene .oluene 24ange -' =Pa or '

6 G F3

• =ethanolD=eth+l Acetate 25deal or 4.L at

F3

• EthanolD1ater 25deal or 4.L at &&#

8Pa3

Discussion0112AspenIntro SimpleVLE 8.0

Documents

Transcript of Discussion0112AspenIntro SimpleVLE 8.0