SOLUBILITY STUDY OF CARBON DIOXIDE IN AQUEOUS 2-(DIETHYLAMINO)ETHANOL (DEAE) SOLUTION

Abstract

Nowadays, environmental concern on climate change and global warming is the main issue because of the higher content of carbon dioxide discharge from power plant to the atmosphere. Chemical absorption with amine solution is a proven technology to remove carbon dioxide. The commercially used amine solution are monoethanolamine (MEA) and methyl diethanolamine (MDEA). However, it still has disadvantages such as low cyclic capacity and high energy requirement. Therefore, new solvents for carbon dioxide capture have been developed to enhance the amine performance. Consequently, the objective of this study is to measure the solubility of carbon dioxide in an aqueous solution of 2-(Diethylamino)ethanol (DEAE) used as a new solvent. It is measured at 30-80 degrees Celsius and carbon dioxide partial pressures ranging from 5 to 100 kPa. The concentration of aqueous DEAE solution are 3, 4 and 5 M. The solubility data of carbon dioxide in aqueous solution of DEAE are compared with that of aqueous solution of MEA and MDEA at the same conditions. The results show that the DEAE has higher cyclic capacity than that of commercial absorbents at the post combustion power plant flue gas stream conditions. This means DEAE can use less energy for regeneration and lead to high energy saving for carbon capture process.