I found rate equations of ethylbenzene dehydrogenation to styrene as shown in the picture . As known, the rate of reaction in gas phase is strongly pressure dependent and as pressure changes the rate will change . However , there is no information about that in the equations .How can I solve this problem and find volume of fixed bed reactor ?
Hi Parvin,
You can use Ergun Equation which is used to calculate for pressure drop through fixed bed reactor. Unfortunately , it will make more challenging step. As pressure changes, there will be change in reaction rate and so on. Better option is to assume that there is no pressure drop operation.
I hope this helps you
You need to see the question that has been asked by a Research Gate colleague six months ago together with the answers given.
https://www.researchgate.net/post/How_to_calculate_the_volume_of_fixed_bed_reactor
Of course, you know that a fixed bed reactor can be adiabatic or isothermal . I think that you will need to relate pressure to volume "with some assumptions" & to take into account the volume of the catalyst used.
You can take several steps and calulate the amount of reaction and presure drop across each step then double the number of steps to see if the calculated pressure drop and composition changes significantly. Repeat until the total pressure drop and product composition no longer change significantly.
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