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### Topic: reactor design has me confused  (Read 2077 times)

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#### alexanda90

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##### reactor design has me confused
« on: October 11, 2012, 12:20:02 AM »
consider the liquid phase sulphuric acid catalysed alkylation of isobutene and butylene to make isooctane
i-C4H10 + C4H8 = i-C8H18
the reaction is irreversible with kinetics r = kCaCb , k = 2.5*10^6 m^6/ kmol^2 s

theres a table here-

MW:                           wt % in feed                  ΔHf                          ΔGf
isooctane- 114                   -                              -60.98                     0.92
isobutane - 58                   70                             -37.5                       -5
butene - 56                       20                             -6                            16.8
h2so4 - 98                        10                              NA                          -

the density independent of conversion is 650 kg/m3. the specific heat of the mixture is 0.5 cal/g C
feed enters at 20 c at a rate of 25 kg/s
1. combine the kinetics into the CSTR reactor material balance to generate a plot of X vs T
2. from the reactor adiabatic energy balance, generate a plot of conversion X vs. T
3. what is the adiabatic temperature and conversion of this system? justify addition of heat transfer capability to the system.

note:: reator design was more than 2 semesters ago and my process design teacher sprung this on us for HW.
need an idea on how to start and go about it. very confused at this stage.

#### curiouscat

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##### Re: reactor design has me confused
« Reply #1 on: October 11, 2012, 12:58:38 AM »
Start by calculating for us what's the heat of reaction.

Also, get moles/sec of each reactant.

Finally, if reaction ran to completion in a closed insulated vessel what would be the total Temp. rise?

#### Widhi Saputra

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##### Re: reactor design has me confused
« Reply #2 on: October 12, 2012, 08:34:43 PM »
sory,,i'm forget,,

The value of k, needs to have the function of temperature, k = f (T), so you must seek the values ​​of A and Ea, the equation k = A exp -Ea/RT,,

as adiabatic, the temperature can be decreased or raising, therefore, the value of k must be a function of temperature k = f (T), unlike the case when Isothermal,, k is not a function of temperature,,