Method and apparatus for converting hydrocarbons into olefins

Patent metadata

Field	Value
Publication number	US-9868680-B2
Application number	US-201113993522-A
Country	US
Kind code	B2
Filing date	Dec 20, 2011
Priority date	Jan 19, 2011
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

An apparatus and method are provided for processing hydrocarbon feeds. The method enhances the conversion of hydrocarbon feeds into conversion products, such as ethylene and propylene. In particular, the present techniques utilize a high-severity reactor integrated with another reactor type to convert hydrocarbons to other petrochemical products.

First claim

The invention claimed is:

1. A hydrocarbon conversion method comprising:
providing a hydrocarbon feed comprising hydrocarbon and an added diluent, wherein the added diluent is added to the hydrocarbon feed in an amount more than zero but up to 10 wt % based on the combined weight of the hydrocarbons and the added diluent, and wherein the diluent is one or more of H 2 O, CO 2 , and H 2 S;
separating the hydrocarbon feed into a first pyrolysis feed comprising methane and the added diluent; and a second pyrolysis feed comprising C 2+ fractions;
exposing the first pyrolysis feed in a first pyrolysis reactor to a peak pyrolysis gas temperature≧1540° C., for a residence time of≦50 milliseconds, and at a pressure≧36 psig to produce a first reactor product comprising ethylene and acetylene, wherein the first reactor product has a C 3+ : acetylene weight ratio that is≦0.5 and an ethylene to acetylene weight ratio that is≧0.04;
exposing the second pyrolysis feed to pyrolysis conditions in a second pyrolysis reactor to produce a second reactor product comprising ethylene and acetylene, wherein the first and second pyrolysis reactors are of different type; and
combining at least a portion of the first reactor product and at least a portion of the second reactor product to form a combined reactor product; wherein the first and second pyrolysis feeds comprise hydrocarbons, the hydrocarbons are derived from the hydrocarbon feed, and the hydrocarbon feed has a hydrogen content in a range of from 8 wt % to 20 wt %.

2. The method of claim 1 , wherein the first reactor product has a C 3+ to acetylene weight ratio≦0.45, and wherein the added diluent is CO 2 .

3. The method of claim 1 , further comprising compressing at least one of (i) the at least a portion of the first reactor product or (ii) the at least a portion of the second reactor product prior to forming the combined reactor product.

4. The method of claim 1 , further comprising converting at least a portion of the combined reactor product into a conversion product comprising ethylene and propylene.

5. The method of claim 4 , further comprising polymerizing at least a portion of the conversion product into one or more of polyethylene and polypropylene.

6. The method of claim 1 , further comprising separating hydrogen from one or more of the at least a portion of the first reactor product, the at least a portion of the second reactor product and the combined reactor product.

7. The method of claim 6 , further comprising passing at least a portion of the separated hydrocarbon to one or more of the first pyrolysis feed and the second pyrolysis feed.

8. The method of claim 6 , further comprising (i) combining a combustion feed with a first portion of the separated hydrogen from one or more of the first pyrolysis reactor and the second pyrolysis reactor and reacting the combustion feed along with the first portion of the separated hydrogen and (ii) passing at least a portion of the separated hydrogen to one or more of the first pyrolysis feed and the second pyrolysis feed.

9. The method of claim 6 , further comprising combining at least a portion of the separated hydrogen with the combined reactor product to form a mixture, and providing the mixture to an acetylene converter unit utilized to convert at least a portion of the mixture to an ethylene product.

10. The method of claim 1 , wherein the peak pyrolysis gas temperature is in the range of 1600.0° C. to 1800.0° C.

11. The method of claim 1 , further comprising:
exothermically reacting a first combustion feed with a second combustion feed to heat a region at least partially within the first pyrolysis reactor;
removing combustion products from the first pyrolysis reactor; and
heating the first pyrolysis feed using at least a portion of the heat generated by the exothermic reaction.

12. The method of claim 1 , wherein the first pyrolysis reactor is a regenerative reverse flow thermal pyrolysis reactor and the second pyrolysis reactor is a steam cracking thermal pyrolysis furnace.

13. A hydrocarbon conversion method comprising:
providing a hydrocarbon feed comprising hydrocarbon and an added diluent, wherein the added diluent is added to the hydrocarbon feed in an amount more than zero but up to 10 wt % based on the combined weight of the hydrocarbons and the added diluent, and wherein the diluent is one or more of H 2 O, CO 2 , and H 2 S;
separating the hydrocarbon feed into a first pyrolysis feed comprising methane and the added diluent and a second pyrolysis feed, the second pyrolysis feed comprising C 2+ fractions;
exposing the first pyrolysis feed in a first pyrolysis reactor to a peak pyrolysis gas temperature≧1540° C., for a residence time of≦50 milliseconds, and at a pressure≧36 psig to produce a first reactor product comprising ethylene and acetylene, wherein the first reactor product has a C 3+ : acetylene weight ratio that is≦0.5 and an ethylene to acetylene weight ratio that is≧0.04;
exposing the second pyrolysis feed to pyrolysis conditions in a second pyrolysis reactor to produce a second reactor product comprising ethylene and acetylene, wherein the first and second pyrolysis reactors are of different type; and
combining at least a portion of the first reactor product and at least a portion of the second reactor product to form a combined reactor product; wherein the first and second pyrolysis feeds comprise hydrocarbons, the hydrocarbons are derived from the hydrocarbon feed, and the hydrocarbon feed has a hydrogen content in the range of≦20 wt %.

14. The method of claim 13 , wherein the added diluent is CO 2 , the first pyrolysis feed has a hydrogen content of between 6 wt % to 12 wt %, the pressure in the first reactor during the pyrolysis is≧44 psig, the peak pyrolysis gas temperature in the first reactor during the pyrolysis is≧1650° C., and the first reactor product has an ethylene to acetylene weight ratio that is≧0.05.

Assignees

• Keusenkothen Paul F
• Hershkowitz Frank
• Davis Jason D
• Exxonmobil Chemical Patents Inc

Inventors

• Keusenkothen Paul F
• Hershkowitz Frank
• Davis Jason D

Classifications

• C10G9/26

  with discontinuously preheated non-moving solid material, e.g. blast and run · CPC title

• C10G9/007

  Visbreaking · CPC title

• C10G9/18

  Apparatus · CPC title

• C07C4/04 Primary

  Thermal processes {(C07C4/025 takes precedence)} · CPC title

• C10G9/00

  Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils · CPC title