Hi,
I'm having a problem that i cannot seem to troubleshoot. My design team was tasked to carry out a simulation of the production of VAM using aspen hysys v8.6. We have come up with a successfully converged system for the first part of the project and right now I'm in charge with optimizing the reactor section. Since the conversion of ethylene was originally at ~9% using the heat transfer tab under the Design parameters page of the reactor set to Direct Q value, i thought in order to carry out a more 'real' process is to switch to the 'Formula' option of the SS Duty calculation option. The coolant I'm using is water-steam at 8bar ~130degC. But the problem is that when i switch to this formula option, the conversion drops to 0.4%. I've increased the flowrate of the coolant and it does not make much of a difference, even changing the dimensions didn't help. I can't upload my hysys file here but if there are any kind souls with sharper eyes and mind, i could send it over to your email.