Preparation of an amine based solvent contaminated by the introduction of sulfur oxides
View Patent ↗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.
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.