초록 ▼

A process is disclosed for cracking a carbo-metallic oil feed containing 650°F. material which is characterized by a carbon residue on pyrolysis of at least about 1 and by a level of heavy metal(s) of at least about 4.0 ppm by weight of Nickel Equivalents. The process includes contacting the feed wi

A process is disclosed for cracking a carbo-metallic oil feed containing 650°F. material which is characterized by a carbon residue on pyrolysis of at least about 1 and by a level of heavy metal(s) of at least about 4.0 ppm by weight of Nickel Equivalents. The process includes contacting the feed with cracking catalyst bearing an accumulation of substantially more than 600 ppm by weight of Nickel Equivalents of heavy metal(s). The resultant stream flows through a progressive flow type reactor for a vapor residence time of about 0.5 to about 10 seconds at conditions sufficient for causing a conversion per pass of about 50% to about 90% while producing coke in amounts of at least about 6% by weight based on fresh feed and laying down coke on the catalyst in amounts of at least about 0.3% by weight based on catalyst. After such contact, catalyst is separated from product vapors, stripped, and thereafter regenerated in at least a first regeneration zone and a second regeneration zone separate from the first regeneration zone. The amount of oxygen-containing gas in the first regeneration zone is sufficient to convert a major portion of the coke on the catalyst to carbon oxides. The amount of oxygen-containing gas in the second regeneration zone is sufficient to reduce the weight of residual coke on the catalyst to about 0.25% or less. The total amount of oxygen-containing gas supplied to all regeneration zones is less than the stoichiometric amount which would be required to burn all of the carbon in the coke to CO2, to burn all of the hydrogen in the coke to water, and to burn any other combustibles which may be present in the coke to their respective combustion products. After such regeneration, the regenerated catalyst is recycled to the reactor for contact with fresh feed.

대표청구항 ▼

A process for converting the residue from partially distilling a hydrocarbonaceous material to lighter products, comprising: I. providing a distillation bottoms oil containing 650°F.+material, said 650°F.+material being characterized by a carbon residue on pyrolysis of at least about 1 and by contai

A process for converting the residue from partially distilling a hydrocarbonaceous material to lighter products, comprising: I. providing a distillation bottoms oil containing 650°F.+material, said 650°F.+material being characterized by a carbon residue on pyrolysis of at least about 1 and by containing at least about 4 parts per million of Nickel Equivalents of heavy metal(s); II. bringing said converter feed together with cracking catalyst bearing substantially more than 600 ppm Nickel Equivalents of heavy metal to form a stream comprising a suspension of said catalyst in said feed and causing the resultant stream to flow through a progressive flow type reactor having an elongated reaction chamber which is at least in part vertical or inclined for a vapor riser residence time in the range of about 0.5 to about 10 seconds at a temperature of about 900°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 at least about 6 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; III. separating said catalyst from the resultant cracking products; IV. stripping said separated catalyst; V. regenerating said metals-bearing, coked catalyst by burning the coke in a two-stage regeneration zone with oxygen-containing combustion-supporting gas while forming combustion product gases comprising CO and/or CO2 and a sulfur oxide, maintaining the CO:CO2 molar ratio of the combustion product gases formed from the burning of at least the major weight portion of the coke at a level of at least about 0.25 while such gases are in heat exchange contact with the catalyst, burning sufficient coke to reduce the weight of carbon on catalyst to about 0.1% or less while limiting the amount of combustion-supporting gas supplied to the regeneration operation as a whole to less than the stochiometric amount which would be required to burn all of the carbon in the coke to CO2, to burn all of the H2 in the coke to H2O and to burn any other combustibles which may be present in the coke to their respective combustion products, and restricting the combined free oxygen mole % of all gases resulting from the entire, completed combustion of coke in said two-stage regeneration zone to zero or an amount substantially less than 2%; and VI. recycling the regenerated catalyst to the reactor for contact with fresh feed.