VLE for acetone-methanol and water
VLE for acetone-methanol and water
(OP)
Hi everyone,
I'm trying to design a distillation column which will separate acetone from methanol. It is an extractive distillation with water as entrainer.
I'm searching now for a VLE for acetone-methanol-water..without any luck..
Can someone help me please?
Thanks,
Carlo
I'm trying to design a distillation column which will separate acetone from methanol. It is an extractive distillation with water as entrainer.
I'm searching now for a VLE for acetone-methanol-water..without any luck..
Can someone help me please?
Thanks,
Carlo





RE: VLE for acetone-methanol and water
http://www.chemsep.org/
RE: VLE for acetone-methanol and water
RE: VLE for acetone-methanol and water
RE: VLE for acetone-methanol and water
I`ve to write a paper for a certain field in my last year at the university (chem. engineering).
W`ll first try to calculate the column manual, subsequent with aspen+. To be more specific, it`s a experimental extractive rectification column without any known characteristics.
Thanks everyone for the reply`s!
Carlo
carlolammers@gmail.com
RE: VLE for acetone-methanol and water
I feel almost certain that the binary mixtures in your system have been measured. Once you get the data, you would re-regress the binary interaction parameters (in Aspen Plus, for your chosen activity coefficient model - I would assume you're considering Wilson, NRTL, or UNIQUAC), since the vapor pressures might not quite agree with those used to regress the data in the DECHEMA books. The multicomponent VLE calculations are based solely on the regressed binary VLE parameters.
If, by some bizarre chance, the data for the constituent binaries is not available, all hope is not lost. You could use the UNIFAC group contribution method to estimate the missing VLE. This is available as an option in Aspen Plus; however, as you should know, UNIFAC estimates of infinite dilution activity coefficients can be off by 30% or more and, therefore, your column simulation may be significantly in error.
RE: VLE for acetone-methanol and water
Another source of data is the Korea Thermophysical Properties Databank, KDB, which is located on the web at:
http://www.cheric.org/research/kdb/ or alternatively at:
http://infosys.korea.ac.kr/kdb/kdb/hcvle/hcvle.php
Best of luck
RE: VLE for acetone-methanol and water
But does anyone know where to find some specific data or can explain me how to calculate:
1)you keep the mole fraction of water constant (e.g. 0.1), what becomes the VLE for acetone-methanol.
2)the same but now the mole fraction of water = 0.2
3)mole fraction water = 0.3
....
Thanks,
Carlo
RE: VLE for acetone-methanol and water
"Computer Calculations for Vapor-Liquid and Liquid-Liquid Equilibria" by Prausnitz, et al (Prentice Hall, 1980).
This book contains voluminous code for doing such calculations - probably too much for someone who doesn;t have the background anyway. That's why such procedures are built into most commercial simulators and are not difficult to use.