Catalytic cracking reaction and distillation
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Dear teachers, I would like to ask: in catalytic cracking, what does the hydrogen-to-carbon ratio refer to? Is it better to have a higher amount of hydrogen? What can this ratio indicate? Also, why are there large fluctuations in the temperature of the oil slurry returning from the fractionation tower, and how can these fluctuations be stabilized? My oil slurry is used for heat exchange with the feedstock. Thank you!!
H/C refers to the ratio of hydrogen to carbon elements in coke, and it can indicate the stripping efficiency. As for the large fluctuations in the return temperature of the fractionator slurry, your description is not clear. There are roughly the following points: 1. Fluctuations in raw materials or moisture content; 2. If medium-pressure steam is also produced, check whether the steam generator is leaking. 3. Is the steam generator operating smoothly? 4. The oil slurry should be returned to the tower through two separate paths; check whether there are any issues with the control valves in each path 5. There are connections between the shell and tube sides of the raw material and slurry heat exchangers, and the temperature of the incoming raw material varies significantly.
Well said! Learn it!* A high hydrogen content is not good! The hydrogen/methane ratio in the dry gas indicates the degree of catalyst contamination! It will disrupt the product distribution and the hydrogen balance!