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1. (WO2017137866) METHODS AND SYSTEMS FOR GENERATING LIGHT OLEFINS USING A CYCLIC REACTOR CONFIGURATION
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CLAIMS

1. A method for generating light olefins by the catalytic cracking of hydrocarbons using a cyclic reactor configuration, the method comprising:

heating a feedstream comprising the hydrocarbons in a first heating unit;

introducing the feedstream to a first reactor train comprising a first catalyst until the first catalyst becomes deactivated;

heating a first regeneration stream comprising a regeneration gas in the first heating unit;

introducing the first regeneration stream to the first reactor train until the first catalyst becomes activated; and

heating the feedstream in a second heating unit and introducing the feedstream to a second reactor train comprising a second catalyst while introducing the first regeneration stream to the first reactor train.

2. The method of claim 1, wherein the hydrocarbons comprise light naphtha.

3. The method of claim 1, wherein the hydrocarbons comprise heavy naphtha, kerosene, and/or diesel.

4. The method of claim 1, wherein the hydrocarbons have a boiling point of less than about 350°C.

5. The method of claim 1, further comprising combining one of water or a diluent with the feedstream.

6. The method of claim 1, wherein the first reactor train and the second reactor train each comprise from one to seven fixed bed reactors.

7. The method of claim 1, wherein the first heating unit and the second heating unit each comprise at least one heat exchanger and at least one fired heater.

8. The method of claim 1, wherein the regeneration gas comprises air.

9. The method of claim 1, wherein the introducing the feedstream to a first reactor train comprises generating a first product stream comprising greater than about 44 wt-% of

combined ethylene and propylene.

10. The method of claim 9, wherein the introducing the feedstream to a second reactor train comprises generating a second product stream comprising greater than about 44 wt-% of combined ethylene and propylene.

11. The method of claim 10, further comprising separating paraffins and C5 and heavier olefins, if any, from the first product stream and the second product stream and combining the paraffins and C5 and heavier olefins with the feedstream.

12. The method of claim 1, further comprising:

introducing the feedstream to the second reactor train until the second catalyst becomes deactivated; and

heating a second regeneration stream comprising a second regeneration gas in the second heating unit and introducing the second regeneration stream to the second reactor train while introducing the feedstream to the first reactor train and until the second catalyst becomes activated.

13. A system for generating light olefins by the catalytic cracking of hydrocarbons using a cyclic reactor configuration, the system comprising:

a first heating unit, coupled to a first reactor train;

a second heating unit, coupled to a second reactor train;

a first air line, coupled to the first heating unit;

a second air line, coupled to the second heating unit;

a feed line, coupled to both of the first heating unit and the second heating unit, for providing a feedstream; and

a valve, coupled to the feed line, for directing the feedstream to one of the first heating unit and the second heating unit.

14. The system of claim 13, wherein the first reactor train and the second reactor train each comprise from one to seven fixed bed reactors.

15. The system of claim 13, wherein the first heating unit and the second heating unit each comprise at least one heat exchanger and at least one fired heater.

16. The system of claim 13, further comprising a separation unit, coupled to the first reactor train and the second reactor train, for separating olefins and unconverted hydrocarbons from a first product line from the first reactor train and a second product line from the second reactor train.

17. The system of claim 16, further comprising a recycle line, coupled to the separation unit and the feed line, for recycling unconverted hydrocarbons.