Preparation of an amine based solvent contaminated by the introduction of sulfur oxides

Patent metadata

Field	Value
Publication number	US-9527037-B2
Application number	US-201113883099-A
Country	US
Kind code	B2
Filing date	Nov 8, 2011
Priority date	Nov 10, 2010
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A method for processing an amine-based solvent contaminated by the introduction of sulfur oxides is provided. A potassium compound is introduced into a contaminated solvent, and the contaminated solvent is cooled so that a solubility of a potassium sulfate becomes less than a specified concentration of potassium sulfate. Further, an oxidizing agent is introduced into the contaminated solvent so that a potassium sulfite is oxidized to potassium sulfate. The potassium sulfate is filtered out, wherein a prepared solvent is formed. Further, a device for processing an amine-based, sulfur oxide-contaminated solvent is provided.

First claim

The invention claimed is:

1. A method for processing an amine-based solvent contaminated by the introduction of sulfur oxides, comprising:
cooling the contaminated solvent so that potassium sulfate crystallizes out of the contaminated solvent;
introducing a potassium compound into a contaminated solvent, wherein the step of introducing the potassium compound in the contaminated solvent compensates for the loss of potassium from the contaminated solvent caused by potassium sulfate crystallization;
introducing an oxidizing agent into the contaminated solvent so that a potassium sulfite is oxidized to potassium sulfate, and
filtering out the potassium sulfate, wherein a prepared solvent is formed.

2. The method as claimed in claim 1 , wherein the oxidizing agent and the potassium compound are mixed together before they are introduced into the contaminated solvent.

3. The method as claimed in claim 1 , wherein the oxidizing agent comprises hydrogen peroxide or ozone.

4. The method as claimed in claim 1 , wherein an amount of the potassium compound supplied is equimolar to an amount of crystallized potassium sulfate.

5. The method as claimed in claim 1 , wherein a temperature T of the contaminated solvent after cooling is between 5° C. and 45° C.

6. The method as claimed in claim 1 , wherein a heat exchange is provided between the prepared solvent and the contaminated solvent so that the contaminated solvent is cooled by the prepared solvent.

7. The method as claimed in claim 1 , wherein the contaminated solvent is obtained from a carbon dioxide-separating process of a fossil-fuel-fired power station process.

8. The method as claimed in claim 7 , wherein the contaminated solvent is processed batch-wise from the carbon dioxide-separating process.

9. The method as claimed in claim 1 , wherein the contaminated solvent is the amino based solvent, wherein the amino based solvent is a potassium-amino acid solution.

10. The method as claimed in claim 1 , wherein the contaminated solvent comprises one or more amines.

11. The method as claimed in claim 1 , wherein the potassium compound comprises potassium hydroxide KOH, potassium hydrogen carbonate or potassium carbonate.

Assignees

• Forbert Rainald
• Hauke Stefan
• Joh Ralph
• Olschewski Frank
• Schneider Rüdiger
• Siemens Ag

Inventors

• Forbert Rainald
• Hauke Stefan
• Joh Ralph
• Olschewski Frank
• Schneider Rüdiger

Classifications

• B01D2251/106

  Peroxides · CPC title

• B01D2251/306

  of potassium · CPC title

• B01D2251/104

  Ozone · CPC title

• Y02C10/06

  Cross-Sectional Technologies · mapped topic

• B01D2257/504

  Carbon dioxide · CPC title