Great question—yes, you can make temperature a dependent variable in Aspen Plus V11 when using RGibbs. There are two common ways, depending on what you want the temperature to “depend on.”

Option A (most typical): Let RGibbs compute T from the energy balance

If you want the reactor temperature to float (i.e., be determined by your two independent inputs such as feed composition, pressure, heat duty upstream, etc.):

This is the cleanest way to say “T depends on X and Y” without imposing a formula—RGibbs computes whatever temperature satisfies equilibrium + energy balance for each (X,Y) point.

Option B: Solve for T that meets a target (conversion, composition, etc.)

If you need temperature to be the value that achieves another specification (e.g., a target conversion or outlet composition), do this:

You can still run a Sensitivity where the two independent variables are (say) pressure and feed ratio; the Design Spec will solve each case, and you record the temperature as the response.

Which should you use?

• If you simply want “T comes out of the model given my two inputs,” use Option A (Adiabatic/Heat-balance).
• If you want “the T that achieves a required conversion/composition,” use Option B (Design Spec + duty).

Tip: In all cases, report stream temperature (reactor outlet) as the response; that’s the reactor temperature you care about. If solids/electrolytes are present, ensure the right property method and phase options are set so the energy balance is consistent.

Thank you very much Ahmed. I will give it a try definitely.