Gas pressurized separation column and process to generate a high pressure product gas

• US 8,425,655 B2
• Filed: 07/09/2010
• Issued: 04/23/2013
• Est. Priority Date: 07/09/2010
• Status: Active Grant

• Current Assignee: Carbon Capture Scientific, LLC
• Original Assignee: Carbon Capture Scientific, LLC
• Inventors: Chen, Shiaoguo, Pan, Zijiang
• Primary Examiner(s): Smith, Duane
• Assistant Examiner(s): WU, IVES J
• Application Number:
  US12/833,906
• Publication Number:
  US 20120009114A1
• Time in Patent Office: 1,019 Days
• Field of Search: 423/220, 423/228, 423/229, 423/437.1, 962/02, 951/69, 952/36, 952/63
• US Class Current: 95/16
• CPC Class Codes: B01D 19/0005 with one or more auxiliary substances
• CPC Class Codes: B01D 19/0015 in contact columns containing plates, grids or other filling elements
• CPC Class Codes: B01D 2252/20405 Monoamines
• CPC Class Codes: B01D 2252/20421 Primary amines
• CPC Class Codes: B01D 2252/20431 Tertiary amines
• CPC Class Codes: B01D 2252/20484 with one hydroxyl group
• CPC Class Codes: B01D 2252/20489 with two or more hydroxyl groups
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 53/1418 Recovery of products
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: C01B 32/50 Carbon dioxide
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The present invention provides a gas pressurized separation system to strip a product gas from a liquid stream and yield a high pressure gaseous effluent containing the product gas. The system comprises a gas pressurized stripping apparatus, such as a column, with at least one first inlet allowing flow of one or more liquid streams in a first direction and at least one second inlet allowing flow of one or more high pressure gas streams in a second direction, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent containing the product gas; and two or more heat supplying apparatuses provided at different locations along the column. Processes for separating a product gas from a gaseous mixture to yield a high pressure gaseous effluent containing the product gas, utilize the gas pressurized separation system described above.

Claims

1. A process for separating a product gas from a gaseous mixture to yield a high pressure gaseous effluent in which the product gas has a partial pressure higher than in the gaseous mixture, comprising:

(a) introducing the gaseous mixture into contact with one or more liquid in an absorption apparatus, to absorb the product gas into the liquid and yield one or more product-enriched liquid;

(b) introducing the product-enriched liquid into at least one inlet of a gas pressurized column and into contact with one or more high pressure gas streams to strip the product gas into the high pressure gas stream and to yield one or more product-lean liquid and one or more high pressure gaseous effluents enriched with the product gas, wherein the gas pressurized column includes heat apparatus supplying heat independently at multiple positions along the gas pressurized column including positions having distinct product gas loadings between the leanest position and the richest position along the gas pressurized column thereby allowing for independent control of the temperature along the gas pressurized column;

(c) recovering heat from the product-lean liquid; and

(d) recycling at least a portion of the product-lean liquid to step (a).

4. The process of claim 1, further comprising after step (b) subjecting the high pressure gaseous effluent from the gas pressurized column to at least one separation process to separate the product gas from the high pressure gaseous effluent.

5. The process of claim 4, wherein the separation process comprises condensation, cryogenic condensation, distillation, absorption, adsorption, and combinations thereof.

6. The process of claim 1, wherein the gaseous mixture contains carbon dioxide.

7. The process of claim 6, wherein the gaseous mixture comprises combustion flue gas from a carbonaceous fuel burning facility.

8. The process of claim 1, wherein the product gas comprises carbon dioxide.

9. The process of claim 1, wherein the high pressure gas stream comprises a single pure gas.

10. The process of claim 1, wherein the high pressure gas stream comprises a mixture of different gases.

11. The process of claim 1, wherein the high pressure gas stream contains carbon dioxide.

12. The process of claim 1, wherein the high pressure gas stream is nitrogen.

13. The process of claim 1, wherein the gas pressurized column used in step (b) comprises:

a gas pressurized stripping column with at least one first inlet allowing flow of one or more liquid streams in a first direction and at least one second inlet allowing flow of one or more high pressure gas streams in a second direction, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent that contains the product gas.

2. A process for separating a product gas from a gaseous mixture to yield a high pressure gaseous effluent in which the product gas has a partial pressure at least 10 times higher than in the gaseous mixture, comprising:

(a) introducing the gaseous mixture into contact with one or more liquid in an absorption apparatus, to absorb the product gas into the liquid and yield one or more product-enriched liquid;

(b) introducing the product-enriched liquid into at least one inlet of a gas pressurized column and into contact with one or more high pressure gas streams to strip the product gas into the high pressure gas stream and to yield one or more product-lean liquid and one or more high pressure gaseous effluents enriched with the product gas;

(c) recovering heat from the product-lean liquid; and

(d) recycling at least a portion of the product-lean liquid to step (a); and

further comprising after step (a) and before step (b), (i) introducing at least a portion of the product-enriched liquid from the absorption apparatus in step (a) into at least one additional absorption apparatus and into contact with a gas stream that comprises at least a portion of the gaseous effluent from the gas pressurized column in step (b), to absorb the product gas into the product-enriched liquid and yield a further product-enriched liquid; and

(ii) subsequently introducing the further product-enriched liquid from the additional absorption apparatus into at least one flasher to recover a portion of the product gas prior to introduction of the product-enriched liquid into the gas pressurized column in step (b).

3. The process of claim 2, wherein more than one additional absorption apparatus is used and they are arranged in series, with at least a portion of the product-enriched liquid leaving each absorber being introduced into the subsequent absorber and one or more additional gas pressurized column as described in step (b) is used between step (ii) and step (b) and they are arranged in series, with at least a portion of the product lean liquid leaving each gas pressurized column being introduced into the subsequent column.

14. A gas pressurized separation system to strip a product gas from a liquid stream to yield a high pressure gaseous effluent that contains the product gas, the system comprising:

(a) a gas pressurized stripping apparatus with at least one first inlet allowing flow of one or more liquid streams into the apparatus and at least one second inlet allowing flow of one or more high pressure gas streams into the apparatus, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent that contains the product gas; and

(b) heat supply apparatuses supplying heat independently at multiple positions along the gas pressurized stripping apparatus including positions having distinct product gas loadings between the leanest position and the richest position along the gas pressurized stripping apparatus thereby allowing for independent control of the temperature along the stripping column.

15. The gas pressurized separation system of claim 14, wherein the heat supplying apparatuses are connected to each other.

16. The gas pressurized separation system of claim 14, wherein the heat supplying apparatuses are separate from each other.

17. The gas pressurized separation system of claim 14, wherein the heat supplying apparatuses are internal to the gas pressurized stripping column.

18. The gas pressurized separation system of claim 14, wherein the heat supplying apparatuses provide heats are external to the gas pressurized stripping column.

19. The gas pressurized separation system of claim 14, wherein the heat is provided through the high pressure stripping gas streams and wherein the second inlet allows for flow of one or more high pressure gas streams at a pressure of at least 4 atm.

20. A method of independently controlling the temperature along a gas pressurized separation system configured to strip a product gas from a liquid stream to yield a high pressure gaseous effluent that contains the product gas, the method comprising:

(a) Providing a gas pressurized stripping apparatus with at least one first inlet allowing flow of one or more liquid streams into the apparatus and at least one second inlet allowing flow of one or more high pressure gas streams into the apparatus, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent that contains the product gas; and

(b) Independently heating at least three or more different locations along the column which have distinct product gas loadings at the heating locations thereby allowing for independent control of the temperature along the stripping column.