our catalytic reforming unit is made up of 4 furnaces and 4 reactors(IFP). The temperature difference across the 3rd reactor was designed to be between 40 and 50 degrees. But for more than 6 months now the temperature difference is between 15 to 25 degrees.The pressure is ok. This is the only reactor given a temperature difference out of its designed specification. Can somebody surgest to me what might be the possible cause of this temperature gradient.
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temperature difference 2
- Thread starter padovano
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The best answer should be provided by IFP themselves.
Anyway, as I figure it, the general multireactor CCR approach includes the following reactions:
[•] In the first reactor the prime reaction is naphthene dehydrogenation (endothermic: ~51-53 kcal/g mole)
[•] In the second reactor, further dehydrogenation and some paraffin dehydrocyclization (endothermic: ~11-17 kcal/g mole) take place with a further drop in temperature
[•] In the third and fourth reactors, slower paraffin isomerization (exothermic:~2.3 kcal/g mol) and paraffin hydrocracking (exothermic:~13.5 kcal/g mole) start to predominate.
Thus, temperature drops in each reactor would normally be affected by a balance among the various reactions, which themselves can be affected by the type of feedstock.
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