Multi-catalyst injection system

1. Apparatus for loading catalyst to a fluid catalyst cracking unit, comprising:

a vessel;

a plurality of catalyst storage regions associated with the vessel;

a metering device associated with the vessel and configured to provided a metric indicative of an amount of catalyst dispensed from a selected one of the catalyst storage regions.

2. The apparatus of claim 1 further comprising:

a pressure control system coupled to the vessel.

3. The apparatus of claim 1 , wherein the metering device further comprises:

a sensor configured to provide a metric indicative of a weight of the vessel and catalyst disposed therein.

4. The apparatus of claim 3 , wherein the sensor further comprises:

a load cell.

5. The apparatus of claim 1 , wherein the metering device further comprises:

a sensor configured to determine a change in volume of catalyst within the vessel or a rate of catalyst movement.

6. Apparatus for loading catalyst to a fluid catalyst cracking unit, comprising:

a vessel configured to selectively provide a plurality of catalysts to a fluid catalyst cracking unit (FCCU), the vessel having a plurality of catalyst inlet ports for loading different catalysts into the vessel;

a metering system configured to determine amounts of catalysts transferred to the FCCU;

a controller coupled to the metering system and containing instructions that, when executed, causes a selective one of the plurality of catalysts to be delivered to the FCCU through the vessel.

7. The apparatus of claim 6 , wherein the metering system further comprises:

a valve coupled to the vessel and configured to control the flow of at least one catalyst within the vessel.

8. The apparatus of claim 6 , further comprising:

a sensor coupled to the controller and configured to provide a metric indicative of an amount of catalyst within the vessel.

9. The apparatus of claim 8 , wherein the sensor further comprises:

a load cell.