The reaction was carried out isothermally at 3 different temperatures during reaction time (temperature during dosing of isocyanate remains the same at all 3 different reaction temperatures). I have gotten increasing heat of reaction with increasing temperature which sounds correct as per logic however, upon calculation the rate constant found to be decreasing as the temperature increases. Any explanations?
Are you really sure, the rate constant goes down with the temperature? How do you measure the reaction heat in case the process is at constant T? You have probably external cooling media with increasing temperature? In any case you need to develop a model for the heat balance around and inside your reactor, and then find the reaction heat through data regression using the experimental data.
https://www.docenti.unina.it/webdocenti-be/allegati/materiale-didattico/540170 can help
Please go to this link :
https://www.britannica.com/science/radiation/Heating-effects
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