Granted Patent
B2
US 12,222,158 · App. 18/348,557 · Granted Feb 11, 2025
Methods and configuration for retrofitting NGL plant for high ethane recovery
Inventors:
John Mak (Santa Ana, CA); Sabrina Devone (Richmond, TX); James Shih (Houston, TX); Curt Graham (Mission Viejo, CA)
Assignee:
FLUOR TECHNOLOGIES CORPORATION
F25J3/0238C10G5/04C10G5/06F25J3/0209F25J3/0233C10G2300/1025C10G2300/4056F25J2200/02F25J2200/30F25J2200/76F25J2205/04F25J2205/60F25J2215/62F25J2290/80
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Abstract
A natural gas liquid plant is retrofitted with a bolt-on unit that includes an absorber that is coupled to an existing demethanizer by refrigeration produced at least in part by compression and expansion of the residue gas, wherein ethane recovery can be increased to at least 99% and propane recovery is at least 99%, and where a lower ethane recovery of 96% is required, the bolt-on unit does not require the absorber, which could be optimum solution for revamping an existing facility. Contemplated configurations are especially advantageous to be used as bolt-on upgrades to existing plants.
Claims (41)
1. A method comprising:
passing an overhead vapor stream from a demethanizer to an absorber;
contacting, within the absorber, the overhead vapor stream with a cold lean residue gas to produce a liquid portion and a vapor portion within the absorber;
passing the liquid portion back to the demethanizer as a reflux; and
passing between about 10% and about 30% of the vapor portion to a reflux exchanger as a first portion of the vapor portion;
cooling, within the reflux exchanger, at least the first portion of the vapor portion to produce a compressed cooled residue gas, wherein the compressed cooled residue gas is used to form the cold lean residue gas;
passing between about 70% and about 90% of the vapor portion to a subcool exchanger as a second portion of the vapor portion.
2. The method of claim 1 , further comprising:
cooling, within the subcool exchanger, a portion of a feed stream;
combining the portion of the feed stream with the liquid portion; and
passing the combined portion of the feed stream and the liquid portion to the demethanizer as the reflux.
3. The method of claim 1 , further comprising:
compressing the first portion of the vapor portion downstream of the reflux exchanger to produce a compressed vapor portion before passing the first portion of the vapor portion though the reflux exchanger a second time.
4. The method of claim 3 , further comprising:
cooling the compressed vapor portion to produce the compressed cooled residue gas.
5. The method of claim 4 , wherein the compressed vapor portion is cooled in the reflux exchanger.
6. The method of claim 5 , wherein the compressed vapor portion is cooled in an air cooler prior to cooling in the reflux exchanger.
7. The method of claim 4 , further comprising:
passing the compressed cooled residue gas to a pressure reduction device to produce the cold lean residue gas.
8. The method of claim 7 , wherein the pressure reduction device comprises a hydraulic turbine or a Joule-Thompson valve.
9. The method of claim 1 , further comprising:
compressing the second portion of the vapor portion downstream of the subcool exchanger to produce a compressed second portion;
combining the compressed second portion with the first portion of the vapor portion downstream of the reflux exchanger to produce a recycle portion before passing the recycle portion though the reflux exchanger a second time.
10. The method of claim 9 , further comprising:
compressing the recycle portion to produce a compressed vapor portion.
11. The method of claim 10 , further comprising:
cooling the compressed vapor portion in an air cooler.
12. The method of claim 10 , further comprising:
separating the compressed vapor portion into a residue gas portion and a recycle portion.
13. The method of claim 12 , wherein the recycle portion of the compressed vapor portion is cooled to produce the compressed cooled residue gas.
14. The method of claim 13 , further comprising:
passing the compressed cooled residue gas to a pressure reduction device to produce the cold lean residue gas.
15. The method of claim 14 , wherein the pressure reduction device comprises a hydraulic turbine or a Joule-Thompson valve.
16. The method of claim 1 , further comprising:
separating a feed stream into a liquid portion and a feed gas vapor portion.
17. The method of claim 16 , further comprising:
cooling at least a first portion of the feed gas vapor portion in the subcool exchanger using at least the second portion of the vapor portion.
18. The method of claim 17 , further comprising:
expanding at least a second portion of the feed gas vapor portion to produce an expanded second portion of the feed gas vapor portion.
19. The method of claim 18 , further comprising:
passing the expanded second portion of the feed gas vapor portion to the demethanizer.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Dec 27, 2024
From: MAK, JOHN; DEVONE, SABRINA; SHIH, JAMES; GRAHAM, CURT
To: FLUOR TECHNOLOGIES CORPORATION
Reel/Frame 069688/0512 →
Continuity (4)
Division
16325696
Provisional Application
62489234
· Apr 24, 2017
Provisional Application
62385748
· Sep 9, 2016
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