초록 ▼

A side-by-side reactor vessel and stripping vessel arrangement uses a rejection vessel to collect the catalyst from the bottom of a reactor vessel and eliminate stagnant layers of catalyst within the reactor vessel while increasing the efficiency of a stripper vessel located to the side of the react

A side-by-side reactor vessel and stripping vessel arrangement uses a rejection vessel to collect the catalyst from the bottom of a reactor vessel and eliminate stagnant layers of catalyst within the reactor vessel while increasing the efficiency of a stripper vessel located to the side of the reactor. Catalyst containing entrained and sorbed hydrocarbons pass from the bottom of a reactor vessel into the small diameter rejection vessel that provides a hydrocarbon rejection zone and uses a fresh stripping medium to maintain a dense fluidized bed from which entrained hydrocarbons are quickly disengaged from the catalyst and travel upward into the reactor vessel. Partially stripped catalyst flows through a passageway that extends horizontally to a stripping vessel that contains a conventional stripping zone. In the stripping vessel, catalyst counter-currently contacts additional stripping medium which removes sorbed hydrocarbons from the catalyst surface. Stripped catalyst is transferred from the stripper vessel to a regeneration zone and stripping gas is returned by the horizontally extending passageway to an upper section of the rejection zone where it recontacts incoming catalyst before passing upwardly into the reactor vessel. In addition to eliminating the stagnant layer of catalyst often associated with a side-by-side reactor and stripper arrangement, the invention also provides additional effective reactor length to accommodate longer cyclones and increases the efficiency of the stripping operation by providing quick disengagement of readily stripped hydrocarbons and additional contacting between the catalyst and stripping gas.

대표청구항 ▼

A side-by-side fluidized catalytic cracking reactor vessel and stripping vessel arrangement comprising: a) a vertically oriented reactor vessel having a catalyst inlet; b) a rejection vessel having a diameter that is less than the diameter of the reactor vessel located subadjacent to and in direct v

A side-by-side fluidized catalytic cracking reactor vessel and stripping vessel arrangement comprising: a) a vertically oriented reactor vessel having a catalyst inlet; b) a rejection vessel having a diameter that is less than the diameter of the reactor vessel located subadjacent to and in direct vertical fluid communication with said reactor vessel, said rejection vessel having a length that is less than the diameter of the reactor vessel and defining a rejection zone having a catalyst outlet in the sidewall of a lower section of said rejection vessel and a stripping gas inlet located at or below said catalyst outlet; c) means for providing a stripping zone including an elongate stripping vessel laterally offset from and located outside of said reactor vessel having a longer vertical length than said rejection vessel; d) means for passing stripping gas from said stripping zone to an upper section of said rejection zone and for passing catalyst from said catalyst outlet to said stripping zone; and e) a reactor riser in communication with said reactor vessel for discharging catalyst and gas into said reactor vessel.