System and process for polarity swing assisted regeneration of gas selective capture liquids

Patent metadata

Field	Value
Publication number	US-9707508-B2
Application number	US-201113224680-A
Country	US
Kind code	B2
Filing date	Sep 2, 2011
Priority date	Sep 2, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A polarity swing-assisted regeneration (PSAR) process is disclosed for improving the efficiency of releasing gases chemically bound to switchable ionic liquids. Regeneration of the SWIL involves addition of a quantity of non-polar organic compound as an anti-solvent to destabilize the SWIL, which aids in release of the chemically bound gas. The PSAR decreases gas loading of a SWIL at a given temperature and increases the rate of gas release compared to heating in the absence of anti-solvent.

First claim

What is claimed is:

1. A process characterized by polarity-swing assisted regeneration of a non-aqueous switchable CO 2 binding organic liquid, the regeneration including the step of:
heating a bound non-aqueous switchable CO 2 binding organic liquid—(CO 2 BOL) having CO 2 bound thereto in the presence of a liquid non-polar organic anti-solvent temperature less than 120° C. to perform the polarity swing to release the bound CO 2 from the CO 2 BOL and regenerate said CO 2 BOL.

2. The method of claim 1 , wherein the temperature is at or below 75° C.

3. The method of claim 1 , wherein the heating includes heating with a geothermal heat source.

4. The method of claim 1 , wherein the heating includes heating with a solar heat source.

5. The method of claim 1 , wherein the heating includes heating with heat from a waste heat source.

6. The method of claim 1 , wherein the heating includes heating with steam delivered from a steam source.

7. The method of claim 6 , wherein the pressure of the steam is above 29.82 psia.

8. The method of claim 6 , wherein the pressure of the steam is above 5.6 psia.

9. The method of claim 6 , wherein the pressure of the steam is above 1.07 psia.

10. The method of claim 6 , wherein the steam source is a condenser.

11. The method of claim 1 , wherein the anti-solvent has a concentration defined by a mole fraction between about 0.05 and about 0.75.

12. The method of claim 1 , wherein the anti-solvent has a concentration defined by a mole fraction between about 0.4 and about 0.5.

13. The method of claim 1 , wherein the regenerating includes recovering heat from an evaporator of a heat pump and transferring the heat from the condenser of the heat pump to a regenerator.

14. The method of claim 1 , wherein the regenerating includes recovering heat from an absorber.

15. The method of claim 1 , wherein the regenerating includes recovering heat from an overhead condenser of a regenerator.

16. The method of claim 1 , wherein the regenerating includes recovering heat from a flue gas cooler.

17. The method of claim 1 , wherein the regenerating includes transferring heat with a heat pump operably coupled to one or more of: a condenser, an evaporator, an absorber, a cooler, a separator, a regenerator, or a reboiler.

18. The method of claim 1 , further including the step of cooling the liquid after the polarity swing to promote a phase separation of the anti-solvent and the regenerated capture solvent.

19. The method of claim 18 , wherein the separating includes a process selected from the group consisting of: centrifuging, coalescing, gravity separating, solvent extracting, freezing, cooling, and combinations thereof.

20. The process of claim 18 , wherein the separating includes recovering the anti-solvent and the regenerated CO 2 BOL in separate phases or phase layers.

Assignees

• Heldebrant David J
• Tegrotenhuis Ward E
• Freeman Charles J
• Elliott Michael L
• Koech Phillip K
• Humble Paul H
• Zheng Feng
• Zhang Jian
• Battelle Memorial Institute

Inventors

• Heldebrant David J
• Tegrotenhuis Ward E
• Freeman Charles J
• Elliott Michael L
• Koech Phillip K
• Humble Paul H
• Zheng Feng
• Zhang Jian

Classifications

• Y02P20/129

  Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D2258/0283

  Flue gases · CPC title

• Y02C10/06

  Cross-Sectional Technologies · mapped topic

• Y02B30/52

  Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency · CPC title