EP0086580A1 — Method and apparatus for fluid catalytic cracking

Claim 1

Independent Claim 76 words

A fluid catalytic cracking apparatus comprising a cracking vessel and a regenerator vessel that comprises a chamber for spent catalyst, a chamber for regenerated catalyst and means which, in use, enables a portion of the catalyst to be recycled from the regenerated catalyst chamber to the spent catalyst chamber, characterized in that the means enabling catalyst to be recycled comprises at least one trickle valve in communication with the chambers for regenerated catalyst and spent catalyst.

Claim 2

Dependent Claim 76 words

A fluid catalytic cracking apparatus comprising a cracking vessel and a regenerator vessel that comprises a chamber for spent catalyst, a chamber for regenerated catalyst and means which, in use, enables a portion of the catalyst to be recycled from the regenerated catalyst chamber to the spent catalyst chamber, characterized in that the means enabling catalyst to be recycled comprises at least one trickle valve in communication with the chambers for regenerated catalyst and spent catalyst.

Claim 3

Dependent Claim 27 words

Apparatus according to claim 1, wherein the chambers for regenerated catalyst and for spent catalyst are mutually adjacent and separated by a wall containing the trickle valve(s).

Claim 4

Dependent Claim 32 words

Apparatus according to claim 2, wherein the wall between the chambers is generally cylindrical and the chamber for regenerated catalyst is generally annular and is arranged around the chamber for spent catalyst.

Claim 5

Dependent Claim 31 words

Apparatus according to claim 1, wherein the chamber for regenerated catalyst includes one or more pipes extending into the chamber for spent catalyst, the or each pipe including a trickle valve.

Claim 6

Dependent Claim 93 words

A fluid catalytic cracking process comprising the steps of cracking a hydrocarbon feed in a reactor riser in the presence of a cracking catalyst, separating cracked product from spent catalyst, regenerating spent catalyst in a regenerator vessel by fluidizing it with a regenerating gas and recycling a portion of the regenerated catalyst to the reactor riser and another portion to the generator vessel for admixture with spent catalyst to be regenerated, characterized in that regenerated catalyst is recycled for admixture with spent catalyst via a trickle valve that prevents backflow of spent catalyst.

Claim 7

Dependent Claim 93 words

A fluid catalytic cracking process comprising the steps of cracking a hydrocarbon feed in a reactor riser in the presence of a cracking catalyst, separating cracked product from spent catalyst, regenerating spent catalyst in a regenerator vessel by fluidizing it with a regenerating gas and recycling a portion of the regenerated catalyst to the reactor riser and another portion to the generator vessel for admixture with spent catalyst to be regenerated, characterized in that regenerated catalyst is recycled for admixture with spent catalyst via a trickle valve that prevents backflow of spent catalyst.

Claim 8

Dependent Claim 28 words

A process according to claim 5, wherein the trickle valve is arranged in a wall that separates the spent catalyst and the regenerated catalyst in the regenerator vessel.

Claim 9

Dependent Claim 25 words

A process according to claim 5, wherein the trickle valve is arranged in a pipe containing regenerated catalyst and extending into the fluidized spent catalyst.

Claim 10

Dependent Claim 31 words

A process according to any one of claims 5 to 7, wherein the weight ratio of regenerated catalyst recycled into the spent catalyst to spent catalyst is from 0.1 to 10.

Method and apparatus for fluid catalytic cracking

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