Process for converting carbo-metallic oils, and addition of MgCl2 to the catalyst.

摘要

A process for economically converting carbo-metallic oils to lighter products. The carbo-metallic oils contain 650 DEG F material which is characterized by a carbon residue on pyrolysis of at least about 1 and a Nickel Equivalents of heavy metals content of at least about 4 parts per million. Theis process comprises flowing the carbo-metallic oil together with particulate cracking catalyst through a progressive flow type reactor having an elongated reaction chamber, which is at least in part vertical or inclined, for a predetermined vapor riser residence time in the range of about 0.5 to about 10 seconds, at a temperature of about 900 to about 1400 DEG F, and under a pressure of about 10 to about 50 pounds per square inch absolute sufficient for causing a conversion per pass in the range of about 50 % to about 90 % while producing coke in amounts in the range of about 6 to about 14 % by weight based on fresh feed. The spent, coke-laden catalyst is separated and regenerated in one or more regeneration beds in one or more regeneration zones by burning the coke with oxygen. MgCl2 is added to the catalyst and is converted to MgO, which reduces sulfur oxide emissions, and a chlorine component, which reduces the CO2/CO ratio, thereby reducing the heat output of the regenerator. The catalyst particles are retained in the regeneration zone or zones to reduce the level of carbon on the catalyst to about 0.25 % by weight or less. The regenerated catalyst is recycled to the reactor and contacted with fresh carbo-metallic oil.