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# kinetic aspen subroutine problem

## kinetic aspen subroutine problem

(OP)
Hi all,
I am a newbie in Aspen..I have a problem simulating a reactive column.
In the simulator I used the radfrac..in this column I have the reaction of dehydration of metanol to DME.The rate of the reaction based on my catalyst is:

r(DME)=(k(s)*C(methanol)^2)/(C(methanol)+(K(w)/K(a))*C(water))

where:
k(s) is the superficial  constant rate and has the following expression:

k(s)=k0*exp(-Ea/RT)
k0 and Ea are knowed

C(methanol) is the concentration of methanol

K(w)/K(a) are adsorption equilibrium constants (w for water,a for methanol)
K(w)/K(a) has the following expression:

K(w)/K(a)=exp(-25.75+11138/T)

I read that I have to modify file usrnt.f than compile it.
I don't know how I can do it.

Can someone post the code of my subroutine or an example of a kinetic aspen subroutine?

Thank you all
Carlo from Italy (sorry for my bad english).

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