Process for controlling the emission of flue gases

• US 9,561,466 B2
• Filed: 07/13/2015
• Issued: 02/07/2017
• Est. Priority Date: 02/01/2012
• Status: Active Grant

• Current Assignee: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. (Hebrew University of Jerusalem)
• Original Assignee: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. (Hebrew University of Jerusalem)
• Inventors: Sasson, Yoel, Sachs, Tatyana, Dvash, Effi, Barnea, Zach
• Primary Examiner(s): VANOY, TIMOTHY C
• Application Number:
  US14/797,564
• Publication Number:
  US 20150314234A1
• Time in Patent Office: 575 Days
• US Class Current: 1/1
• CPC Class Codes: B01D 2252/30 Ionic liquids and zwitter-ions
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2257/602 Mercury or mercury compounds
• CPC Class Codes: B01D 53/507 by treating the gases with other liquids
• CPC Class Codes: B01D 53/64 Heavy metals or compounds thereof, e.g. mercury
• CPC Class Codes: B01D 53/96 Regeneration, reactivation or recycling of reactants

Abstract

The invention is a process for absorbing sulfur dioxide from a gaseous stream with the aid of an ionic liquid, followed by the release of sulfur dioxide from the ionic liquid on addition of a polar solvent and the regeneration of the ionic liquid.

Claims

1. A process for removing sulfur dioxide from a gaseous mixture, comprising contacting said gaseous mixture with a liquid absorbent comprising one or more ionic liquids, adding a polar solvent to said absorbent to remove the sulfur dioxide from said absorbent and regenerating the absorbent.

2. The process of claim 1, wherein the absorbent comprises at least one chloride, bromide or iodide ionic liquids.

3. The process of claim 2, wherein the absorbent is free of fluoride salts.

4. The process of claim 2, wherein the ionic liquid is selected from the group consisting of 1-butyl-3-methyl-imidazolium chloride and 1-butyl-3-methyl-imidazolium bromide.

5. The process of claim 1, wherein the solvent added to the absorbent is a polar protic solvent.

6. The process of claim 5, wherein the polar protic solvent is selected from the group consisting of C1-C5 alkanols.