Enrichment in CO₂ Absorption by 2-Methyl Piperazine-Activated Tertiary Amines, Physical Solvents, and Ionic Liquid Systems

Abstract

One of the ever-demanding research fields is the development of new solvents with better properties for mitigation of CO 2 compared to existing solvents. This work reports the measurement and modeling of CO 2 solubility in newly proposed aqueous solvent blends of 2-methyl piperazine with N -methyldiethanolamine (MDEA), sulfolane (TMSO 2 ), and 1-butyl-3-methyl-imidazolium acetate ([bmim] [Ac]). The operating temperature and CO 2 partial pressure conditions chosen were 303.2–323.2 K and 2–370 kPa, respectively. Along with this, qualitative 13 C NMR and FTIR analysis were also performed to consider the proposed reaction scheme. The experimental vapor–liquid equilibrium data were modeled by a modified Kent–Eisenberg equilibrium model. The equilibrium constants associated with 2-methyl piperazine (2-MPZ) and [bmim] [Ac] deprotonation and carbamate formation reactions were regressed to fit the experimental CO 2 solubility data. In addition, the CO 2 cyclic capacity and heat of absorption were evaluated for the aq (MDEA + 2-MPZ) blend.

Aqueous Potassium Salt of L-Cysteine as Potential CO2 Removal Solvent: An Investigation on Physicochemical Properties and CO2 Loading Capacity

“…Research has indicated that the effectiveness of the solvent mixture for CO 2 extraction can be enhanced by combining MDEA with activators. 2-Amino-2-methyl-1-propanol (AMP), piperazine (PZ), amino ethyl ethanol amine (AEEA), and diethanol amine (DEA) are the common activators used to increase the reaction kinetics and absorption capacity of aqueous amine solvents [28,29]. In industry, PZ blended with MDEA has been commonly employed as the standard solvent for purifying natural gas.…”

Efficient and Easily Recyclable Catalyst for the Alkylation Reaction of Phenol and tert-Butyl Alcohol

“…In recent years, ionic liquids have attracted much attention due to their specific properties, such as undetectable vapor pressure, easy to separate from the reaction system, and environmentally friendly. − Hence, ionic liquids have been used in many fields, especially in catalysis; it was proved that a large number of reactions could be catalyzed by ionic liquids, such as esterification, − carbonylation, − cycloaddition, − and alkylation reaction. − …”