Q & A > Question Details
Feed incompatibility is normally a cause for fouling increase in the upper radiant section, due to asphaltene precipitation.
P-value is normally used to measure asphaltene precipitation tendency in other processes (like visbreaking, fueloil, etc).
Has anybody experience of the successful application of P-value (or any other similar) to predict compatibility issues in Delayed coker feed? If so, what is the minimum p-value recommended?
12/07/2018 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
For detection of flocculation or precipitation of asphaltenes in fuel oil and higher residue oils during blending there are many Laboratory techniques available. Some of the methods are ASTM D 6703- Standard Test Method for Automated Heithaus Titrimetry , ASTM D 7112 - Standard Test Method for Determining Stability and Compatibility of Heavy Fuel Oils and Crude Oils by Heavy Fuel Oil Stability Analyzer (Optical Detection), ASTM D 7157 - Standard Test Method for Determination of Intrinsic Stability of Asphaltene-Containing Residues, Heavy Fuel Oils, and Crude Oils (n-Heptane Phase Separation; Optical Detection). These are useful quality tools.