Chemical absorption is one of the most mature method for post combustion CO₂ capture. The current paper gives an overview of the development of solvent for CO₂ capture. In addition to ammines, ammonia solutions, amino acid salts, potassium carbonate solutions are typical solvents which have been widely investigated. Many novel solvents have been proposed, for example blended amines, phase change solvents, ionic liquid, nanofluids based absorbent, switchable solvents and designer amines. The advantages and disadvantages of the solvents are introduced and among them blended amine solutions and phase change solvents are the most promising novel solvents which have great potential in decrease energy consumption.

Contents
1 Introduction
2 Technical analysis of CO₂ chemical absorption
2.1 System process of CO₂ chemical absorption
2.2 Characteristics of CO₂ chemical absorption
3 Solvent development
3.1 Typical solvents
3.2 Novel solvents
4 Conclusion and outlook