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Side Products Simulation For Catalystic Reactors

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#1 HappyFeet


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Posted 05 February 2021 - 09:39 AM

Hi, I am in my final year and is doing a project on synthesis of methyl methacrylate. I am doing oxidation of isobutene and is doing a reactor design for it. I realised that there are side products for oxidation of isobutene such as CO and CO2 but cannot simulate that in Hysys. How do I stimulate side products in my stimulation? 

#2 SilverShaded


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Posted 07 February 2021 - 04:04 AM

Define the reaction extents, what kind of model are you builiding.  Kinetic, equilibrium, fixed converision or?  All the reaction equations can be added to the reaction scheme.

#3 HappyFeet


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Posted 08 February 2021 - 12:33 AM

Hi, my reactions are kinetic reaction and I have keyed in into hysys. I am using PFR to simulate it but apparently my conversion of isobutene is damn low. So here are my following reactions for oxidation of isobutene. 


Isobutene + oxygen -> methacrolein + water

Isobutene + oxygen -> carbon dioxide + water

Isobutene +oxygen -> acetone + water + carbon dioxide 

Isobutene + oxygen -> acetic acid + water + carbon dioxide 


the reaction is exothermic and i was given to obtain 50 kgtonne/annum of methacrolein. The plant operates at 8000h/annum. The current conversion I am obtaining is very low (~ 25% ) for methacrolein. I have checked my kinetics with others and it seems to be correct. I am just wondering what's the issue as my friends are able to get up to 80% of the conversion. I have attached some information of my aspen here. 

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Edited by HappyFeet, 08 February 2021 - 12:39 AM.

#4 pmoneysh


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Posted 09 February 2021 - 02:57 AM

 what is your rate basis?? is it reactor volume or catalyst amount? and remember the unit of pre-exponential factor is in SI unit using aspen plus or hysys

Edited by pmoneysh, 09 February 2021 - 02:57 AM.

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