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FORTRAN / Excel VBA subroutine for solving ODE's on ASPEN plus

FORTRAN / Excel VBA subroutine for solving ODE's on ASPEN plus

FORTRAN / Excel VBA subroutine for solving ODE's on ASPEN plus

I am modeling glucose fermentation to butanol using monod kinetics on Aspen plus. I have selected an USER defined reaction kinetics to do this.
Basically its monod equation with 3 ODE's that needs to be solved by writing code on FORTRAN or VBA and linking it with Aspen.
Can someone help me with the complete procedure to write the subroutine on Aspen? Atleast to the point where I will have to write the codes will be greatly helpful. My email id is: chemshyamsvce@gmail.com
Thank you!

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