Mixtures of physical absorption solvents and ionic liquids for gas separation

• US 9,321,004 B2
• Filed: 04/30/2013
• Issued: 04/26/2016
• Est. Priority Date: 04/30/2013
• Status: Expired due to Fees

• Current Assignee: UOP Llc (Honeywell International Inc.)
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Broderick, Erin M., Bhattacharyya, Alakananda
• Primary Examiner(s): Godenschwager, Peter F
• Application Number:
  US13/873,804
• Publication Number:
  US 20140319419A1
• Time in Patent Office: 1,092 Days
• Field of Search: 252/190
• US Class Current: 1/1
• CPC Class Codes: B01D 2252/30 Ionic liquids and zwitter-ions
• CPC Class Codes: B01D 2252/504 Mixtures of two or more absorbents
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

The invention comprises an absorbent composition and process for purification of gaseous mixtures. The composition comprises a mixture of a physical absorption solvent and an ionic liquid. It was found that the mixtures provided improved absorption of a gas component, such as carbon dioxide, when compared physical absorption solvents.

Claims

1. A composition comprising an ionic liquid and a physical absorption solvent wherein said ionic liquid comprises a cation selected from the group consisting of ammonium, phosphonium, pyrazolium, pyrrolidinium, sulfonium, piperidinium, caprolactamium, guanidinium, and morpholium and an acetate anion wherein the physical absorption solvent is a dimethyl ether of polyethylene glycol.

2. The composition of claim 1 wherein said cation is a tetraalkyl phosphonium.

3. The composition of claim 1 further comprising water.

4. The composition of claim 1 wherein said composition comprises from about 1-45 vol % physical absorption solvent.

5. The composition of claim 1 wherein said composition comprises from about 10-35 vol % physical absorption solvent.

6. The composition of claim 1 wherein said composition comprises from about 10-30 vol % of said physical absorption solvent.

7. The composition of claim 1 wherein said composition comprises from about 10-20 vol % of said physical absorption solvent.