초록 ▼

An apparatus for the catalytic cracking of hydrocarbons having two independent transfer line reactors, each of which is associated with an independent cyclone separation system and wherein the cyclone separation systems are located within a common separator vessel. More particularly, the improved ap

An apparatus for the catalytic cracking of hydrocarbons having two independent transfer line reactors, each of which is associated with an independent cyclone separation system and wherein the cyclone separation systems are located within a common separator vessel. More particularly, the improved apparatus can be used for the simultaneous fluidized catalytic cracking of a hydrocarbon feedstock and the recracking of a selected fraction of the products from said cracking without commingling the feedstock and the selected fraction to be recracked.

대표청구항 ▼

A fluid catalytic cracking and fractionation apparatus for simultaneously effecting primary cracking of a hydrocarbon feedstock, separating the cracked products into a desired product fraction, and a second fraction suitable for additional secondary cracking, and for recracking said second fraction,

A fluid catalytic cracking and fractionation apparatus for simultaneously effecting primary cracking of a hydrocarbon feedstock, separating the cracked products into a desired product fraction, and a second fraction suitable for additional secondary cracking, and for recracking said second fraction, said apparatus comprising: (a) a primary cracking reactor having inlet means at its lower end for introduction of hydrocarbon feedstock and regenerated fluid catalytic cracking catalyst, the upper end of said primary cracking reactor opening into a separator vessel; (b) a primary fractionation tower interconnected with the vapor space at the top of the separator vessel for receiving and separating the vaporized cracked products from said primary cracking reactor; (c) a secondary riser reactor having inlet means at its lower end for receiving an intermediate fraction from said primary fractionation tower together with regenerated fluid catalytic cracking catalyst, the downstream end of said secondary riser reactor being within said separator vessel; (d) a flow reversal means at the downstream end of said secondary riser reactor and an attached downwardly directed flow reversal conduit for directing the flow of recracked hydrocarbon product and entrained cracking catalyst downwardly toward the bottom of said separator vessel; (e) cyclone separator means having an opening laterally communicating with the interior of said flow reversal conduit and connected to vent the recracked hydrocarbon products outside of the separator vessel; and (f) pressure control means for maintaining the pressure within said flow reversal conduit at least equal to or slightly higher than the pressure within said separator vessel whereby flow of vapor from said separator vessel into said cyclone separator means is prevented.