Precipitating Characteristics of Potassium Bicarbonate Using Concentrated Potassium Carbonate Solvent for Carbon Dioxide Capture. Part 1. Nucleation

Abstract

Potassium carbonate is considered a promising solvent for carbon dioxide (CO2) capture as it is cost-effective and environmentally benign when compared to traditional amine-based solvents. In order to increase absorption capacity, the use of concentrated potassium carbonate solvent has been proposed in which CO2 absorption results in precipitation of bicarbonate. Understanding the formation of the solids in that system is important if this is to be used for CO2 capture. In this work, the precipitation behavior in the ternary system of potassium carbonate-potassium bicarbonate-water was studied in a batch cooling crystallizer equipped with Focused Beam Reflectance Measurement (FBRM) and an Op..