Catalytic cracking reaction heat
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Have you guys ever estimated the reaction heat of catalytic cracking? Or what is the value of the reaction heat for catalytic cracking that you are aware of? There should be a difference between heavy oil catalysis and wax oil catalysis, right? If available, please let me know what the reaction heat of fresh raw materials in your unit is approximately (in kJ/kg). Thank you!
The previous design usually used 100, but there are some variations in practice; it’s somewhere between 60 and 100. If you wish, you can perform a thermal balance calculation for the reverse system; there will be some differences depending on the device used.
The net heat brought by the catalyst – the heat required to raise the temperature of the oil and gas – the heat needed for LS heating – the heat lost through cooling = the reaction heat. Then, divide this value by your total feed volume; for the plant I calculated, the result was around 200, which is not very different from the design value