초록 ▼

The invention relates to an installation for the fluidized-bed cracking of a hydrocarbon feedstock. In accordance with the invention recycling of the regenerated catalyst particles to the intake of the reactor comprise, from upstream to downstream, a preferably substantially vertical pipe (1) for th

The invention relates to an installation for the fluidized-bed cracking of a hydrocarbon feedstock. In accordance with the invention recycling of the regenerated catalyst particles to the intake of the reactor comprise, from upstream to downstream, a preferably substantially vertical pipe (1) for the discharge of the regenerated particles from the regenerator, and a substantially straight pipe (2) connected to the vertical pipe (1) and sloping downward therefrom to the base (3) of the reactor to which it is connected, the downward-sloping pipe (2) being connected to the vertical pipe (1) and to the base (3) of the reactor through inward-curved portions or elbows which impose neither a sharp change in direction on the course of the particles nor sudden changes in the diameter of the pipes.

대표청구항 ▼

Apparatus for the fluidized-bed cracking of a hydrocarbon feedstock, comprising an essentially vertical, upflow tubular type of reactor having a bottom portion with a base and an upper portion; means for injecting into the reactor the feedstock to be cracked; means for introduction at the base of th

Apparatus for the fluidized-bed cracking of a hydrocarbon feedstock, comprising an essentially vertical, upflow tubular type of reactor having a bottom portion with a base and an upper portion; means for injecting into the reactor the feedstock to be cracked; means for introduction at the base of the reactor at least one gas capable of maintaining the catalyst particles in a fluidized bed condition; means in the upper portion of the reactor for the ballistic separation of spent catalyst particles and cracked hydrocarbons; means for regeneration of the spent particles by combustion of the coke deposited thereon; means for conducting the spent particles from the reactor to the regeneration means; and means for recycling the regenerated particles from the regeneration means to the base of the reactor, the means for recycling the regenerated catalyst particles to the base of the reactor being metallic piping free of expansion joints and internally provided with an abrasion-resistant heat-insulating refractory liner, such recycling means comprising, from upstream to downstream, a substantially vertical pipe connected to said regeneration means for receiving the discharge of the regenerated particles from the regeneration means, and a substantially straight transfer pipe connected to the vertical pipe at an obtuse angle a1 measured from the substantially vertical pipe and sloping downwardly therefrom to the bottom of the reactor to which it is connected at an acute angle a2 measured from the longitudinal axis of said reactor, the downwardly-sloping transfer pipe being respectively connected to the vertical pipe and to the bottom of the reactor through curved portions defining elbows at said angles a1 and a2 respectively, the elbow which has the angle a2 forming a continuous curved passage into the bottom of said reactor with the downstream upwardly curved portion of said elbow defining said base of said reactor and containing said means for injection, the length of said downwardly sloping transfer pipe being substantially greater than the length of the upwardly curved portion of said elbow having the angle a2 , and the downwardly-sloping transfer pipe and the elbow connecting such transfer pipe to the base of the reactor each having a cross-sectional diameter substantially equal to that of the reactor base to which the elbow is connected.