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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM




Category: Refining
Question: How can one reduce the FCCU slurry oil production in a refinery and how can one maximuze profits from a FCCU unit?
Keywords: v1i14,refining,fcc,fccu,slurry,oil,maximize,profit
Answer: There are a number of approaches, which of these would be right for the specific unit will depend on the current operation and unit limitations.Recycling slurry back to the riser will reduce slurry yield, but will increase coke yield and regenerator temperature.Increasing conversion may decrease slurry yield (depending what conversion you are currently running). Conversion can be increased by increasing reactor temperature and/or decreasing feed temperature.Increasing the cut point between LCO and slurry will reduce slurry yield. It will also increase the temperature in the bottom of the main fractionator and may increase the risk of coking in the fractionator.You may be able to reduce slurry at relatively constant conversion by changing catalyst. Generally (but not always) catalysts that reduce slurry yield tend to increase delta coke and regenerator temperature.Increasing the profit from the slurry oil generally means finding an outlet other than fuel oil. The most common alternate sales route for FCC slurry is as carbon black feed. To be sold into this market, however, the slurry must meet specifications on ash content, sulfur, and BMCI. Sulfur is usually the main sticking point for most FCC operations.Another, though less common outlet, is as feed to a needle coker. Again, the slurry will need to meet some fairly stringent specifications with regard to ash, sulfur, density and aromatics content.Slurry actually has some value as a fuel oil blend stock because of its high aromatic content, high flash point and relatively low viscosity. You may be able to realize some of this value either through sales to other fuel oil producers or by valuing the slurry properly in your own fuel oil blends.Reference: Joseph Wilson, FCC Consultant, Barnes & Click, Inc.


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