Cyclic thermal swing adsorption with direct heat transfer

Patent metadata

Field	Value
Publication number	US-9968882-B2
Application number	US-201615274382-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 25, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A heat transfer fluid can be used as part of a multi-phase adsorption environment to allow for improved separations of gas components using a solid adsorbent. The heat transfer fluid can reduce or minimize the temperature increase of the solid adsorbent that occurs during an adsorption cycle. Reducing or minimizing such a temperature increase can enhance the working capacity for an adsorbent and/or enable the use of adsorbents that are not practical for commercial scale adsorption using conventional adsorption methods. The multi-phase adsorption environment can correspond to a trickle bed environment, a slurry environment, or another convenient environment where at least a partial liquid phase of a heat transfer fluid is present during gas adsorption by a solid adsorbent.

First claim

The invention claimed is:

1. A method for adsorbing a gas component, comprising:
exposing an input fluid comprising a first gas component and a heat transfer liquid to adsorbent particles to produce an adsorbent effluent having a lower concentration of the first gas component than the input fluid, the input fluid comprising a first temperature prior to contacting the adsorbent particles, a loading of adsorbed first gas component in the adsorbent particles at the end of the exposing being at least about 0.01 mol/kg; and
desorbing at least a portion of the first gas component from the adsorbent particles at a desorption temperature greater than the first temperature.

2. The method of claim 1 , wherein the first gas component comprises CO 2 .

3. The method of claim 1 , wherein the adsorbent particles comprise a Type V adsorbent.

4. The method of claim 1 , wherein a loading of adsorbed first gas component in the adsorbent particles after the desorbing is less than 50% of the loading of first gas component in the adsorbent particles at the end of the exposing.

5. The method of claim 1 , wherein the desorption temperature is greater than the first temperature by at least about 25° C.

6. The method of claim 1 , wherein the adsorbent particles are exposed to the heat transfer liquid at a second temperature for a period of time prior to the exposing the adsorbent particles to the input fluid at the first temperature.

7. The method of claim 6 , wherein the second temperature differs from the first temperature by about 10° C. or less.

8. The method of claim 1 , wherein the loading of the adsorbed first gas component in the adsorbent particles after the desorbing is about 0.5 mol/kg or less.

9. The method of claim 1 , wherein the loading of the adsorbed first gas component in the adsorbent particles after the desorbing is about 0.5 mol/kg to about 3.0 mol/kg.

10. The method of claim 1 , wherein the adsorbent particles comprise a Type I adsorbent, a Type V adsorbent, or a combination thereof.

11. The method of claim 1 , wherein the exposing the input fluid to the adsorbent particles comprises exposing the input fluid to the adsorbent particles in a slurry contactor, a fluidized bed contactor, a trickle bed contactor, or a combination thereof.

12. The method of claim 11 , wherein the input fluid is exposed to the adsorbent particles in a trickle bed contactor, the first gas component and the input fluid being introduced into the trickle bed contactor as separate fluids.

13. The method of claim 1 , wherein the input fluid comprises a variable amount of the heat transfer liquid during the exposing.

14. The method of claim 13 , wherein the input fluid comprises one or more pulses of the heat transfer liquid, a flow rate of the heat transfer liquid during a pulse being at least about 25% greater than an average flow rate of the heat transfer liquid during the exposing.

15. The method of claim 1 , wherein the adsorbent particles comprise functionalized adsorbent particles.

16. The method of claim 15 , wherein the heat transfer liquid does not substantially wet the functionalized adsorbent particles.

17. The method of claim 1 , wherein the desorbing of the adsorbed first gas component comprises forming a desorption effluent comprising at least about 90 vol % of the first gas component.

18. The method of claim 1 , wherein the adsorbent particles are coated with an omniphobic coating.

19. The method of claim 1 or 18 , wherein the adsorbent particles comprise one of Zeolite 5A, mmen-Mg 2 (dobpdc), and Zeolite 13X.

20. The method of claim 18 , wherein the omniphobic coating is applied via one of chemical vapor deposition and rotary chemical vapor deposition.

21. The method of claim 18 , wherein the omniphobic coating is trichloro(1H,1H,2H,2H-perfluorooctyl)silane.

22. A method for adsorbing CO 2 , comprising:
exposing an input fluid comprising CO 2 and a heat transfer liquid to adsorbent particles to produce an adsorbent effluent having a lower concentration of CO 2 than the input fluid, the input fluid comprising a first temperature prior to contacting the adsorbent particles, a loading of adsorbed CO 2 in the adsorbent particles at the end of the exposing being at least about 0.01 mol/kg; and
desorbing CO 2 from the adsorbent particles at a desorption temperature greater than the first temperature.

23. A method for adsorbing a gas component, comprising:
exposing an input fluid comprising a first gas component and a heat transfer liquid to adsorbent particles having a Type V adsorption isotherm to produce an adsorbent effluent having a lower concentration of the first gas component than the input fluid, the input fluid comprising a first temperature prior to contacting the adsorbent particles, a loading of adsorbed first gas component in the adsorbent particles at the end of the exposing being at least about 0.01 mol/kg; and
desorbing at least a portion of the first gas component from the adsorbent particles at a desorption temperature greater than the first temperature.

24. A method for adsorbing a gas component, comprising:
exposing an input fluid comprising a first gas component and a heat transfer liquid to adsorbent particles to produce an adsorbent effluent having a lower concentration of the first gas component than the input fluid, the input fluid comprising a first temperature prior to contacting the adsorbent particles, a loading of adsorbed first gas component in the adsorbent particles at the end of the exposing being at least about 0.01 mol/kg; and
desorbing at least a portion of the first gas component from the adsorbent particles at a desorption temperature, the desorption temperature being less than about 10° C. different from the first temperature.

25. A system for separation of CO 2 from a gas flow, the system comprising:
a contactor comprising a bed of adsorbent particles, the adsorbent particles comprising mmen-Mg 2 (dobpdc) having an adsorbent loading of at least about 3.0 moles of CO 2 per kilogram of adsorbent; and
a heat transfer liquid in fluid connectivity with the contactor.

26. The system of claim 25 , wherein the contactor comprises a trickle bed contactor.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Weston Simon C
• Afeworki Mobae
• Minhas Bhupender S
• Gupta Ramesh
• Caram Hugo S
• Chaudhury Manoj K
• Thomann Hans
• Vroman Hilda B
• Nines Meghan

Classifications

• B01J20/3206

  Organic carriers, supports or substrates · CPC title

• B01J20/226

  Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F) · CPC title

• B01D53/0423

  Beds in columns · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title