Acetic Acid: 0,4222
Water: 0,5474
Ethyl Acetate: 0,0214
Acethaldeyde: 0,0076
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Posted 14 January 2016 - 09:00 PM
Acetic Acid: 0,4222
Water: 0,5474
Ethyl Acetate: 0,0214
Acethaldeyde: 0,0076
Posted 15 January 2016 - 06:02 AM
Hello Avancini,
Components have the following n.b.p. [°C]: 118, 100, 77 and 21 respectively.
You may use NRTL package with UNIFAC estimation of VLE coeff.
There is only one azeotrope (homogeneous, water-acetate = 40.3 / 59.7 %mol) with n.b.p. of 70.7 °C.
Assume that the objective of the separation is a impurity of 0.001%mol water in bottoms and 0.001%mol acetic acid in distillate.
All these show that:
- an atmospheric column should be provided with a reboiler and a partial condenser (in case of total condenser, the pressure should be increased to around 2.8 barg in order to use cooling water in condenser);
- there is no need for a side draw;
- as specifications you can use the impurities value in distillate and bottoms + either overhead vapors rate, either condenser temperature;
- minimum number of theoretical plates (NTP) is around 25 (you can't use ShortCut Distillation to easily find it because of azeotrope presence, but you can find it by decreasing number of trays until reflux ratio gets very high, hundreds);
- as a start configuration, use 2*25 stages (48 trays + partial condenser + reboiler).
Posted 15 January 2016 - 12:03 PM
I want to correct myself: impurities above should be 0.1%mol, not 0.001 %mol (this is not suitable for a distillation column ).
Also, i forgot to say that position of feed tray should be the 35th tray, numbering from the top.
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