7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 1/6

© 2012 Aspen Technology, Inc. All rights reserved

Revised: Nov 27, 2012

Dynamic Analysis of 

Cyclohexane Production withAspen HYSYS® V8.0

7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 2/6

© 2012 Aspen Technology, Inc. All rights reserved | 2

Objectives

Convert steady-state simulation to dynamic.

Become familiar with Aspen Dynamics user interface

Investigate sudden changes in hydrogen feed rate onproduct composition and flowrate

7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 3/6

© 2012 Aspen Technology, Inc. All rights reserved | 3

Background

Cyclohexane can be produced from the following reaction:

3H2+C6H6  C6H12

Aspen HYSYS Dynamics allows users to see how a system

switches from one steady-state condition to another one dueto changes in the operating conditions.

Being able to predict how a system will respond todisturbances helps process engineers avoid undesirableresults

7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 4/6

© 2012 Aspen Technology, Inc. All rights reserved | 4

Key Teaching Points

Pressure driven dynamic simulation requires specification of inlet and outlet pressures.– Flowrates are determined from pressure drop.

Valves can be sized automatically by HYSYS Dynamics andmanually be specifying a conductance value.– Conductance values can be changed once the results of a dynamic

simulation are observed

Reactor feeds can be controlled to maximize productproduction

7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 5/6

© 2012 Aspen Technology, Inc. All rights reserved | 5

Problem Statement

Conversion reactor– 1080 ft3 

– Hydrogen feed 310 lbmole/hr

– Benzene feed 100 lbmole/hr

Dynamic sequence– Run simulation for 1 hour

– Ramp hydrogen feed from 310 lbmole/hr to 300 lbmole/hr over 1 hour

– Run simulation for 1 hour

– Over 1 hour, ramp hydrogen feed up to 320 lbmole/hr

– Run simulation for 1 additional hour

7/29/2019 Dyn 003H Cyclohexane

http://slidepdf.com/reader/full/dyn-003h-cyclohexane 6/6

© 2012 Aspen Technology, Inc. All rights reserved | 6

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 of AspenTech. 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.

AspenTech®, aspenONE®, and the Aspen leaf logo, aretrademarks of Aspen Technology, Inc.. Brands and product namesmentioned in this documentation are trademarks or service marksof their respective companies.