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Process for cracking high-boiling hydrocarbons using high ratio of catalyst residence time to vapor residence time
Process for cracking high-boiling hydrocarbons using high ratio of catalyst residence time to vapor residence time
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机译：使用高催化剂停留时间与蒸气停留时间的比率裂解高沸点烃的方法
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摘要
A process for economically converting carbo-metallic oils to lighter products. The carbo-metallic oils contain 650° F.+ material which is characterized by containing material which will not boil below about 1025° F., 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. This 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. degree. to about 1400° 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, and laying down coke on the catalyst in amounts in the range of about 0.3 to about 3% by weight. The ratio of residence time of catalyst in the reactor to residence time of vapor in the reactor (slippage) is in the range of about 1.2:1 to about 12:1, preferably about 1.5:1 to about 5:1. This extended catalyst residence time results in increased dealkylating and cracking of high-boiling hydrocarbons. The spent, coke-laden catalyst is separated from the stream of hydrocarbons formed by vaporized feed and resultant cracking products and regenerated in one or more regeneration beds in one or more regeneration zones by burning the coke on the spent catalyst with oxygen. The regenerated catalyst is recycled to the reactor and contacted with fresh carbo- metallic oil.
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