Method for the conversion of feedstock containing naphtha to low carbon olefins and aromatics

1. A method of producing low carbon olefins and/or aromatic from feedstock comprising naphtha; the method comprising:

a) feeding feedstock comprising naphtha into a fast fluidized bed reactor;

b) contacting the feedstock with a catalyst under reaction conditions in the fast fluidized bed reactor such that the contacting produces a gas product and spent catalyst;

c) separating the gas product to produce a stream comprising primarily one or more low carbon olefins and/or one or more aromatics;

d) transporting the spent catalyst to a regenerator;

e) regenerating the spent catalyst in the regenerator to form regenerated catalyst; and

f) returning the regenerated catalyst to the fast fluidized bed reactor;

wherein the catalyst comprises a microsphere catalyst;

wherein the fast fluidized bed reactor that the catalyst is Geldart A particle and a operation gas line velocity is between 2 and 10 m/s; and where there is a dense phase region and a dilute phase region in the reactor.

2. The method of claim 1 , wherein the reaction conditions in the fast fluidized bed reactor comprise:

a reaction temperature in a range of 580 to 720° C., and a reaction pressure in a range of 0.01 to 0.3 MPa.

3. The method of claim 2 , wherein the one or more low carbon olefins is a member selected from the group consisting of ethylene, propylene and butadiene.

4. The method of claim 1 , wherein the reaction conditions in the fast fluidized bed reactor comprise:

a catalyst to naphtha mass ratio of 10 to 80.

5. The method of claim 4 , wherein the one or more low carbon olefins is a member selected from the group consisting of ethylene, propylene and butadiene.

6. The method of claim 1 , wherein the catalyst to naphtha mass ratio is in a range of 20 to 50.

7. The method of claim 1 , wherein step f) includes: returning the regenerated catalyst to the fast fluidized bed reactor via a regenerator stripping section and a regenerator inclined pipe.

8. The method of claim 1 , wherein the average diameter of the microsphere catalyst is 300 μm.

9. The method of claim 8 , wherein the average diameter of the microsphere catalyst is in a range of 30 to 300 μm.

10. The method of claim 8 , wherein the average diameter of the microsphere catalyst is in a range of 50 to 150 μm.

11. The method of claim 1 , wherein the distillation point of the naphtha is in the range 20 to 200° C.

12. The method of claim 1 , further including:

feeding the feedstock comprising naphtha through an inlet of the fast fluidized bed reactor and into a fast fluidized bed of the fast fluidized bed reactor;

flowing effluent from the fast fluidized bed reactor to a stripper;

separating, by the stripper, the effluent into the spent catalyst and the gas product;

flowing the gas product into a separation system to obtain a stream comprising one or more low carbon olefins and/or one or more aromatics;

transporting the spent catalyst into the stripper;

transporting the spent catalyst from the fluidized bed reactor through a stripper to a stripper inclined pipe and then to a regenerator riser;

lifting, by gas, the spent catalyst through the regenerator riser into the regenerator; and

returning the regenerated catalyst to the fast-fluidized bed reactor via a stripping section of the regenerator and a regenerator inclined pipe.

13. The method of claim 12 , wherein the one or more aromatics is selected from the list consisting of: benzene, toluene, and xylene.

14. The method of claim 1 , wherein, in the gas product, yield of low carbon olefins is in a range of 38 to 47 wt. %, yield of aromatics is in a range of 15 to 20 wt. % and yield of methane is in a range of 7 wt. % to 8 wt. %.

15. The method of claim 14 , wherein the one or more low carbon olefins is a member selected from the group consisting of ethylene, propylene and butadiene.

16. The method of claim 1 , wherein the one or more low carbon olefins is a member selected from the group consisting of ethylene, propylene and butadiene.

17. A method of producing low carbon olefins and/or aromatic from feedstock comprising naphtha; the method comprising:

a) feeding feedstock comprising naphtha into a fast fluidized bed reactor;

b) contacting the feedstock with a catalyst under reaction conditions in the fast fluidized bed reactor such that the contacting produces a gas product and spent catalyst;

c) separating the gas product to produce a stream comprising primarily one or more low carbon olefins and/or one or more aromatics;

d) transporting the spent catalyst to a regenerator;

e) regenerating the spent catalyst in the regenerator to form regenerated catalyst; and

f) returning the regenerated catalyst to the fast fluidized bed reactor, wherein step d) includes: transporting the first portion of the spent catalyst from the fluidized bed reactor through a stripper to a stripper inclined pipe and then to a regenerator riser; and

lifting, by gas, the spent catalyst through the regenerator riser into the regenerator;

wherein the fast fluidized bed reactor that the catalyst is Geldart A particle and a operation gas line velocity is between 2 and 10 m/s; and where there is a dense phase region and a dilute phase region in the reactor.

18. The method of claim 17 , wherein the one or more low carbon olefins is a member selected from the group consisting of ethylene, propylene and butadiene.

19. A method of producing low carbon olefins and/or aromatic from feedstock comprising naphtha; the method comprising:

a) feeding feedstock comprising naphtha into a fast fluidized bed reactor;

b) contacting the feedstock with a catalyst under reaction conditions in the fast fluidized bed reactor such that the contacting produces a gas product and spent catalyst;

c) separating the gas product to produce a stream comprising primarily one or more low carbon olefins and/or one or more aromatics;

d) transporting the spent catalyst to a regenerator;

e) regenerating the spent catalyst in the regenerator to form regenerated catalyst; and

f) returning the regenerated catalyst to the fast fluidized bed reactor;

wherein in the gas product a yield of low carbon olefins is in a range of 38 to 47 wt. %;

and wherein, in the gas product, yield of aromatics is in a range of 15 to 20 wt. % and yield of methane is in a range of 7 wt. % to 8 wt. %; and

wherein the one or more low carbon olefins is a selection of the list consisting of: ethylene, propylene, and butadiene;

wherein the fast fluidized bed reactor that the catalyst is Geldart A particle and a operation gas line velocity is between 2 and 10 m/s; and where there is a dense phase region and a dilute phase region in the reactor.