Petroleum Refinery Engineering
In case of liquid petrofuels, momentary combustion is observed at its

Flame temperature
Preheating temperature corresponding to viscosity of 25 centistokes
Fire point
Flash point

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Petroleum Refinery Engineering
Asphalts are

All of these
Desirable in catalytic cracking feedstock, because they produce coke
. Low molecular weight & low boiling point compounds present in petroleum
Readily oxidisable and form carbonaceous sludge

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