| 摘要 |
<p>The invention relates to the absorption of carbon dioxide from a process gas using a solution of potassium carbonate circulating around a circuit, to provide potassium bicarbonate, in the presence of diethanol amine as a catalyst and potassium vanadate as a corrosion inhibitor, followed by desorption of the carbon dioxide in the circuit. Organic acid salts of potassium build-up in the circuit, and there is withdrawal of a side stream of part of the aqueous solution from the circuit, dilution thereof with aqueous diluent, and passing thereof over a semi-permeable membrane to remove the organic acid salts of potassium from the side stream, as an aqueous solution thereof. The vanadate anions are prevented from passing through the membrane, and the remainder of the side stream is returned to the circuit, make up of potassium carbonate and diethanol amine being added to the circuit, as required.</p> |
