Carbon dioxide recovery plant

• US 6,592,829 B2
• Filed: 01/31/2001
• Issued: 07/15/2003
• Est. Priority Date: 06/10/1999
• Status: Expired due to Term

• Current Assignee: Praxair Technology Incorporated (Linde Plc)
• Original Assignee: Praxair Technology Incorporated (Linde Plc)
• Inventors: Chakravarti, Shrikar, Gupta, Amitabh
• Primary Examiner(s): TRAN, HIEN THI
• Application Number:
  US09/774,031
• Publication Number:
  US 20010026779A1
• Time in Patent Office: 895 Days
• Field of Search: 422/168-173, 422/190, 422/198, 962/02, 962/03
• US Class Current: 422/171
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/1418 Recovery of products
• 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

A system for recovering absorbate such as carbon dioxide from an oxygen containing mixture wherein carbon dioxide is concentrated in an alkanolamine containing absorption fluid, oxygen is separated from the absorption fluid, the resulting fluid is heated, and carbon dioxide is steam stripped from the absorption fluid and recovered.

Claims

1. Apparatus for recovering absorbate from an oxygen-containing feed mixture comprising:

(A) an absorption column, means for passing a feed mixture comprising oxygen and absorbate into the lower portion of the absorption column, and means for passing absorbent comprising at least one alkanolamine into the upper portion of the absorption column;

(B) an oxygen separator and means for passing fluid from the lower portion of the absorption column into the oxygen separator;

(C) a heat exchanger and means for passing fluid from the oxygen separator to the heat exchanger;

(D) a stripping column and means for passing fluid from the heat exchanger to the upper portion of the stripping column; and

(E) means for recovering absorbate from the upper portion of the stripping column.

2. The apparatus of claim 1 wherein the oxygen separator comprises an oxygen stripping column.

3. The apparatus of claim 1 wherein the oxygen separator comprises a flash tank.

4. The apparatus of claim 1 further comprising a reboiler, means for passing fluid from the lower portion of the stripping column to the reboiler, and means for passing fluid from the reboiler to the heat exchanger.

5. The apparatus of claim 4 further comprising means for passing fluid from the reboiler to the lower portion of the stripping column.

6. The apparatus of claim 4 further comprising a purifier, means for passing fluid from the reboiler to the purifier, and means for passing fluid from the purifier to the lower portion of the stripping column.

7. The apparatus of claim 1 wherein the means for recovering absorbate from the upper portion of the stripping column comprises a condenser and a phase separator.

8. The apparatus of claim 7 further comprising means for passing fluid from the phase separator to the upper portion of the stripping column.

9. The apparatus of claim 1 further comprising means for recovering absorbate from the oxygen separator.