Thermo 020H Decanter
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Transcript of Thermo 020H Decanter
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2012 Aspen Technology, Inc. All rights reserved
Revised: November 26, 2012
Use of a Decanter to Recover Solvent
and Cross Distillation Boundarieswith Aspen HYSYS
Using Aspen HYSYS V8.0
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Objectives
Learn how to use a 3 phase separator to recover solvent
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Background
The decanter in this example is part of the heterogeneousazeotropic distillation process where ethanol and water areseparated to produce anhydrous ethanol by usingcyclohexane as the solvent.
The feed to this decanter is the distillate product from thefirst column, which has a composition very close to theethanol/water/cyclohexane ternary azeotrope.
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Key Teaching Points
Since cyclohexane and water are immiscible, one of the outletstreams from the decanter contains ~90% of cyclohexane andis recycled back to the first column.
The second outlet stream from the decanter has a composition
that is in a distillation region that is different from thedistillation region that the first column is operated in. Thesecond stream is feed to the second distillation column.
Thus this decanter plays two roles: Recover the solvent.
Cross distillation boundaries.
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Recommended Further Exercises
Use a decanter to separate a stream consisting of water,n-butanol and 3-methylhexane with the followingspecifications: Component flowrates: 50.03584, 0.0679802 and 78.66669 kmol/hr
respectively.
Temperature: 30 C. Pressure: 1 bar.
This is part of the solution to separate a 50:50 (on the mole basis) water/n-butanolmixture with one column and one decanter. This decanter is used to accomplish what istypically accomplished by the second column in an azeotropic distillation process toobtain a pure product and recover the solvent.
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Copyright
Copyright 2012 by Aspen Technology, Inc. (AspenTech). Allrights reserved. This work may not be reproduced or distributedin any form or by any means without the prior written consent ofAspenTech. ASPENTECH MAKES NO WARRANTY ORREPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITHRESPECT TO THIS WORK and assumes no liability for any errors or
omissions. In no event will AspenTech be liable to you fordamages, including any loss of profits, lost savings, or otherincidental or consequential damages arising out of the use of theinformation contained in, or the digital files supplied with or foruse with, this work. This work and its contents are provided foreducational purposes only.
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