Catalytic cracking yield prediction formula (based on the carbon residue value of the catalytic feed, saturated hydrocarbon content, and crude oil density)
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How accurate is predicting and estimating the yield of a catalytic cracking unit based on the properties of the feed oil used in that unit? The predictive estimate for my system is generally calculated using the following formulas: When the feed is atmospheric-pressure residue, the yield = 85 – (char value – 4.5) – (66 – saturated hydrocarbon content)/3. When the feed is wax oil, the yield = 86 – (char value – 1) – (wax oil density – 919)/1000/2*100 – (66 – saturated hydrocarbon content)/3. I welcome any valuable suggestions from everyone.
It is generally a mixed feed, not a single raw material! So is the formula you provided calculated based on the proportions of the raw materials?
Where did this calculation formula come from?
How accurate is predicting and estimating the yield of a catalytic cracking unit based on the properties of the feed oil used in that unit? The predictive estimates for my unit are generally calculated using the following formulas: When the feed is atmospheric-pressure residue plus wax, the yield = 86 – (char value – 4.5) – ((density – 919)/1000/2)*100% – (66 – saturated hydrocarbon content)/3 – (oil slurry yield)/2. When the feed is wax oil, the yield = 86 – (char value – 3) – ((wax oil density – 919)/1000/2)*100% – (66 – saturated hydrocarbon content)/3 – (oil slurry yield)/2. Our plant uses these formulas to calculate yields, and the results are quite accurate.
What value is used for the oil slurry yield?
For the slurry yield reported in the oil product data, our plant only counts half of it.
When there is slurry spillage.
Did the formula come from the compliance document?
This was summarized by our leadership after referring to others’ formulas and having discussions.