In-Line Device for Gas-Liquid Contacting, and Gas Processing Facility Employing Co-Current Contactors

• US 20120238793A1
• Filed: 07/22/2011
• Published: 09/20/2012
• Est. Priority Date: 03/16/2011
• Status: Active Grant

• Current Assignee: Exxonmobil Upstream Research Company (Exxon Mobil Corporation)
• Original Assignee: Exxonmobil Upstream Research Company (Exxon Mobil Corporation)
• Inventors: Cullinane, John T., Grave, Edward J., Northrop, Paul S.
• Granted Patent: US 8,899,557 B2
• Time in Patent Office: Days
• US Class Current: 585/833
• CPC Class Codes: B01D 19/0036 Flash degasification the other groups take precedence
• CPC Class Codes: B01D 2252/2023 Glycols, diols or their derivatives
• CPC Class Codes: B01D 2256/24 Hydrocarbons
• CPC Class Codes: B01D 2257/80 Water
• CPC Class Codes: B01D 3/14 Fractional distillation or use of a fractionation or rectification column
• CPC Class Codes: B01D 53/18 Absorbing units; Liquid distributors therefor B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32
• CPC Class Codes: B01D 53/263 by absorption
• CPC Class Codes: C10L 3/103 Sulfur containing contaminants
• CPC Class Codes: C10L 3/106 of water

Abstract

Provided are gas processing facilities for the separation of components in a gas stream and methods of using the same. The facility includes one or more co-current contactors. Each contactor includes a mass transfer vessel having a mixing section. The mixing section receives a gas stream and a liquid contacting stream. The mixing section mixes theses two streams and releases a two-phase flow. Each contactor also includes a separator that receives the two-phase fluid stream from the mass transfer vessel in-line, and then separates a vapor phase from a liquid phase. The separator has a gas-phase outlet configured to release the vapor phase as a treated gas stream, and a liquid-phase outlet configured to release the liquid phase as a loaded treating solution. The contactors may be used to remove water or other contaminant from a natural gas stream or other gas stream.

Claims

1. A co-current contactor for the separation of components in a fluid stream, the contactor comprising:

a mass transfer vessel having a first end and a second end;

a first inlet configured to receive the fluid stream proximate the first end of the mass transfer vessel;

a second inlet configured to receive a liquid contacting stream also proximate the first end of the mass transfer vessel;

a mixing section within the mass transfer vessel configured to receive the fluid stream and the liquid contacting stream and to provide a mixed, two-phase flow;

a separator proximate the second end of and in-line with the mass transfer vessel, configured to receive the two-phase flow from the mass transfer vessel and then separate a vapor phase from a liquid phase;

a gas outlet at the at the separator configured to release the vapor phase as a treated gas stream; and

a liquid-phase outlet at the separator configured to release the liquid phase as a loaded treating solution;

wherein the separator is designed to separate fluid components without substantially relying upon gravity separation.

2. The co-current contactor of claim 1, wherein:

the mass transfer vessel comprises an elongated tubular body configured to be connected in-line with a flow line; and

the separator also comprises an elongated tubular body configured to be connected in-line with the flow line.

3. The co-current contactor of claim 2, wherein the mixing section comprises an eductor having (i) a mixing chamber that receives the gas stream and the liquid contacting stream, and (iii) a diffuser having an expanded diameter that releases the mixed, two-phase flow.

4. The co-current contactor of claim 3, further comprising (ii) a throat defining an elongated reduced-diameter portion intermediate the mixing chamber and the diffuser.

5. The co-current contactor of claim 2, wherein the mixing section comprises a static mixer having at least one mixing element.

6. The co-current contactor of claim 2, wherein the mass transfer vessel and the separator each comprises an outer diameter that is substantially similar to an outer diameter of the flow line.

7. The co-current contactor of claim 2, wherein the mass transfer vessel and the separator defines a single cylindrical wall forming an outer diameter of the co-current contactor, and that houses the mixing section and the separator.

8. The co-current contactor of claim 1, further comprising:

an intermediate mass transfer volume configured to receive the mixed, two-phase flow from the mixing section in-line and to provide further mass transfer between the two phases, and then release the two-phase flow to the separator.

9. The co-current contactor of claim 8, wherein, the mass transfer volume comprises at least one mixing element.

10. The co-current contactor of claim 8, wherein the mass transfer volume comprises a tubular body having a substantially empty bore.

11. The co-current contactor of claim 8, wherein:

the mass transfer vessel and the separator each comprises an elongated tubular body configured to be connected in-line with a flow line; and

the intermediate mass transfer volume defines an elongated tubular body also configured to be connected in-line with the flow line.

12. The co-current contactor of claim 11, wherein the mass transfer vessel, the intermediate mass transfer volume, and the separator each comprises an outer diameter that is substantially similar to an outer diameter of the flow line.

13. The co-current contactor of claim 11, wherein the mass transfer vessel, the mass transfer volume, and the separator defines a single cylindrical wall forming an outer diameter of the co-current contactor, and that houses the mixing section, the mass transfer volume, and the separator.

14. The co-current contactor of claim 11, wherein:

the mixing section, the mass transfer volume, and the separator each comprises a separate cylindrical wall connected through flanges; and

the mixing section, the mass transfer volume, and the separator are connected end-to-end such that the separate cylindrical walls together form a housing for the co-current contactor.

15. The co-current contactor of claim 1, wherein the separator comprises one or more demisting cyclones.

16. The co-current contactor of claim 1, wherein the separator comprises a first cyclonic phase separator followed by a mesh pad separator, followed by a second cyclonic phase separator, in series.

17. A gas processing facility for the separation of components in a gas stream, the facility comprising at least one co-current contactor of claim 1.

18. The gas processing facility of claim 17, wherein the at least one co-current contactor comprises a first co-current contactor and a final co-current contactor.

19. The gas processing facility of claim 17, wherein the first and final co-current contactors are in parallel.

20. The gas processing facility of claim 2, wherein the first co-current contactor and the final co-current contactor are in series.

21. The gas processing facility of claim 20, wherein:

the treated gas stream released through the gas outlet of the first co-current contactor is a first partially-treated gas stream;

the loaded treating solution released through the liquid-phase outlet of the first co-current contactor is a rich treating solution;

the gas stream received by the mixing section of the final co-current contactor is a previous partially-treated gas stream;

the liquid contacting stream received by the mixing section of the final co-current contactor is a lean liquid solvent; and

the treated gas stream released through the gas outlet of the final co-current contactor is a final treated gas stream.

22. The gas processing facility of claim 21, wherein:

the initial gas stream is a gas stream from a hydrocarbon production operation;

the natural gas stream comprises methane and water;

the second inlet of each contactor receives a desiccant as the liquid contacting stream;

the rich treating solution comprises primarily separated water and the desiccant.

23. The gas processing facility of claim 21, wherein the initial gas stream is:

a gas stream from a hydrocarbon recovery operation,

a tail gas stream from a Claus sulfur recovery process,

an acid gas stream from a solvent regeneration process requiring H₂S enrichment,

a synthesis-gas stream,

a flue gas stream from an industrial plant,

an acid gas stream from a cement plant, or

a flash gas stream created internally within the gas processing facility.

24. The gas processing facility of claim 23, wherein:

the gas stream is a natural gas stream from a hydrocarbon production operation;

the liquid contacting stream is a solvent for absorbing an acid gas component;

the first partially-treated gas stream is a first partially-sweetened gas stream; and

the final treated gas stream is a final sweetened gas stream that comprises primarily methane.

25. The gas processing facility of claim 21, wherein the gas processing facility further comprises an inlet separator that filters out impurities from the gas stream before delivering the initial gas stream to the first co-current contactor.

26. The gas processing facility of claim 21, wherein the natural gas stream has been substantially dehydrated before entering the first co-current contactor.

27. The gas processing facility of claim 26, wherein:

the natural gas stream comprises hydrogen sulfide as a sour gas component; and

the solvent comprises amine for selective H₂S removal.

28. The gas processing facility of claim 27, further comprising:

a liquid solvent regenerator configured to produce the lean liquid solvent.

29. A method of separating fluidic components in a natural gas stream in a gas processing facility, the initial gas stream comprising methane and water, and the method comprising:

providing at least a first co-current contactor and a final co-current contactor, each of these co-current contactors being configured (i) to receive a gas stream and a liquid desiccant, and (ii) to release a treated gas stream and a separate desiccant solution;

arranging the first co-current contactor and the final co-current contactor to deliver the respective treated gas streams as progressively dehydrated gas streams in series;

further arranging the final co-current contactor and the first co-current contactor to deliver the respective desiccant solutions as progressively wetter desiccant streams in series;

delivering a regenerated liquid desiccant to the final co-current contactor; and

operating the gas processing facility in order to remove water from the initial gas stream and to deliver a final dehydrated gas stream from the final co-current contactor; and

wherein each of the co-current contactors comprises the elements of claim 1.

30. A method of separating fluidic components in an initial gas stream in a gas processing facility, the initial gas stream comprising a non-absorbing gas and an acid gas, and the method comprising:

providing at least a first co-current contactor, a second co-current contactor and a final co-current contactor, each of these co-current contactors being configured (i) to receive a gas stream and a liquid solvent, and (ii) to release a treated gas stream and a separate gas-treating solution;

arranging the first co-current contactor, the second co-current contactor and the final co-current contactor to deliver the respective sweetened gas streams as progressively sweetened gas streams in series;

further arranging the final co-current contactor, the second co-current contactor and the first co-current contactor to deliver the respective gas-treating solutions as progressively richer solvent streams in series;

delivering a regenerated liquid solvent to the final co-current contactor; and

operating the gas processing facility in order to remove at least one acid gas component from the initial gas stream and to deliver a final sweetened gas stream from the final co-current contactor; and

wherein each of the co-current contactors comprises the elements of claim 1.

31. A method of regenerating a liquid solvent stream in a gas processing facility, the liquid solvent stream comprising primarily an acid gas and a solvent, and the method comprising:

providing at least a first co-current contactor, a second co-current contactor and a final co-current contactor, each of these co-current contactors being configured (i) to receive a liquid solvent stream and a stripping gas stream, and (ii) to release an acid gas stream and a separate gas treating solution;

arranging the first co-current contactor, the second co-current contactor and the final co-current contactor to deliver the respective acid gas streams as progressively acidic gas streams in series;

further arranging the final co-current contactor, the second co-current contactor and the first co-current contactor to deliver the respective gas-treating solutions as progressively leaner liquid solvent streams in series;

delivering a rich liquid solvent to the final co-current contactor; and

operating the gas processing facility in order to remove at least one acid gas component from the rich liquid solvent stream and to deliver a regenerated gas treating solution from the first co-current contactor; and

wherein each of the co-current contactors comprises the elements of claim 1.