US 4,729,825 AGranted

Method and apparatus for contacting feed materials with fluidized solids

AssigneePhillips Petroleum Company

InventorRichard H. Nielsen

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Abstract

A method of feeding a mixture of fluidized solids, such as cracking catalyst, and a fluidized feed material to be contacted therewith, such as a hydrocarbon feedstock to be cracked, into a contacting zone. In another aspect, method and apparatus useful in starting up a catalytic cracking unit are disclosed.

Claims15

Dependent claims

A method of feeding a mixture of fluidized solids and a fluid feed material into a contacting zone to contact, said fluid feed material with said fluidized solids under cracking conditions, which comprises:

(a) introducing a purging fluid consisting essentially of steam at a purging fluid flow rate through atomization nozzle means upwardly into said contacting zone while maintaining a fluid pressure upstream of said atomization nozzle means to force fluid through the said atomization nozzle means;
(b) introducing a first fluidizing medium into a lower portion of a feeding zone, located below and in communication with said contacting zone, at a flow rate sufficient to fluidize solids in said feeding zone, to increase the velocity level of fluidized solids in said feeding zone and to move said fluidized solids to an upper portion of said feeding zone;
(c) introducing a second fluidizing medium into said upper portion of said feeding zone at a flow rate sufficient to further increase the velocity level of fluidized solids in said feeding zone and to move said fluidized solids from said feeding zone into said contacting zone;
(d) introducing solids into said feeding zone, intermediate said upper and lower portions thereof, whereby said solids are fluidized and moved from said feeding zone as fluidized solids into said contacting zone by said first fluidizing medium and said second fluidizing medium;
and
(e) upon the achievement of desired operating conditions in said contacting zone, introducing said fluid feed material through said atomization nozzle means upwardly into said contacting zone at an increasing fluid feed material flow rate while simultaneously reducing said purging fluid flow rate and controlling said fluid pressure upstream of said atomization nozzle means until the achievement of 0% flow of said purging fluid and 100% flow of said fluid feed material through said atomization nozzle means into said contacting zone to contact said fluidized solids.

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Dependencies are inferred from the claim text.

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Abstract

(a) introducing a purging fluid consisting essentially of steam at a purging fluid flow rate through atomization nozzle means upwardly into said contacting zone while maintaining a fluid pressure upstream of said atomization nozzle means to force fluid through the said atomization nozzle means;
(b) introducing a first fluidizing medium into a lower portion of a feeding zone, located below and in communication with said contacting zone, at a flow rate sufficient to fluidize solids in said feeding zone, to increase the velocity level of fluidized solids in said feeding zone and to move said fluidized solids to an upper portion of said feeding zone;
(c) introducing a second fluidizing medium into said upper portion of said feeding zone at a flow rate sufficient to further increase the velocity level of fluidized solids in said feeding zone and to move said fluidized solids from said feeding zone into said contacting zone;
(d) introducing solids into said feeding zone, intermediate said upper and lower portions thereof, whereby said solids are fluidized and moved from said feeding zone as fluidized solids into said contacting zone by said first fluidizing medium and said second fluidizing medium;
and
(e) upon the achievement of desired operating conditions in said contacting zone, introducing said fluid feed material through said atomization nozzle means upwardly into said contacting zone at an increasing fluid feed material flow rate while simultaneously reducing said purging fluid flow rate and controlling said fluid pressure upstream of said atomization nozzle means until the achievement of 0% flow of said purging fluid and 100% flow of said fluid feed material through said atomization nozzle means into said contacting zone to contact said fluidized solids.

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