1-(2-hydroxyethyl)piperazine, also known as hydroxyethylpiperazine, contains secondary and tertiary amines as well as hydroxyl groups within its molecule. It exhibits both basic and hydroxyl reactivity and can undergo alkylation, acylation, and esterification reactions. It is commonly used as a curing agent for epoxy resins, an intermediate in the synthesis of pharmaceuticals and pesticides, a raw material for surfactants, and a corrosion and scale inhibitor in water treatment.

CO2 Solubility in the 1-(2-Hydroxyethyl)piperazine + Water System

Power generation by burning fossil fuels is the most important source of greenhouse gas emissions that cause global climate change. According to Chen and Rochelle’s research, the screening results indicate that there is a lower heat-of-CO2 absorption and an equal absorption rate as well as a higher cyclic capacity in 1-methylpiperazine (1MPZ) than in PZ. However, 1MPZ has greater volatility than MEA and PZ (Mandal et al., 2001). The high volatility is usually a problem for commercial use. Among all derivatives of PZ, 1-(2-Hydroxyethyl)piperazine (HEPZ) has the highest boiling point of 246°C, a melting point of ?38.5°C, and better water solubility and thermal stability than PZ. HEPZ can withstand higher temperatures and configure higher-concentration solutions in industrial applications, which show the potential of 1-(2-Hydroxyethyl)piperazine to replace PZ as an activator. Since no literature studied the absorption performance of the HEPZ aqueous solution and mixed-amine system with HEPZ, there is a need to measure the relevant experimental data. The results calculated by the model in this study agreed with experimental data, and at the same time, the composition, cyclic capacity, and heat of absorption of the 1-(2-Hydroxyethyl)piperazine aqueous system are predicted and analyzed by the model as well.[1]

CO2 solubility was measured using the stainless-steel reactor for 1-(2-Hydroxyethyl)piperazine aqueous solutions with three concentrations (5 wt%, 15 wt%, and 30 wt%) and four temperatures. Then, the VLE data for HEPZ/H2O were acquired using a gas–liquid double-circulation kettle at negative pressures (30 pKa, 40 pKa, 55 pKa, 70 pKa, and 85 pKa) and atmosphere pressure, within various mole fractions. The e-NRTL model as well as the sequential regression method were adopted to successfully develop a rigorous thermodynamic model for HEPZ/CO2/H2O in Aspen Plus. The missing physical parameters for HEPZ and the amine ions and the physical properties of interactions of NRTL as well as ENRTL were regressed from data acquired from this study and the literature. Based on the data from this study and the corresponding literature, the missing physical parameters of 1-(2-Hydroxyethyl)piperazine, the standard state characteristics of amine ions, the interaction parameters of the non-random two-liquid model (NRTL), and ENRTL were regressed, including vapor pressure as well as heat capacity Cp of 1-(2-Hydroxyethyl)piperazine, vapor–liquid equilibrium (VLE), heat capacity of mixture aqueous solutions, pKa data for HEPZ/H2O, and CO2 solubility data for HEPZ/CO2/H2O. All calculated results agreed with the data obtained from experiments andCarbon capture and storage (CCS), as the process of capturing CO the literature.

Synthesis of piperazine functionalized magnetic sporopollenin

Scientists described the successful functionalization/magnetization of bio-polymeric spores of Lycopodium clavatum (sporopollenin) with 1-(2-Hydroxyethyl)piperazine. Analytical techniques, i.e., Fourier transform infrared (FT-IR), field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometer (VSM), were used to confirm the formation of 1-(2-Hydroxyethyl)piperazine-functionalized magnetic sporopollenin (MNPs-Sp-HEP). The proposed adsorbent (MNPs-Sp-HEP) was used for the removal of noxious Pb(II) and As(III) metal ions from aqueous media through a batch-wise method. Different experimental parameters were optimized for the effective removal of selected noxious metal ions. Maximum adsorption capacity (q m ) 13.36 and 69.85 mg g?1 for Pb(II) and As(III), respectively, were obtained. Thermodynamic parameters such as free energy (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also studied from the adsorption results and were used to elaborate the mechanism of their confiscation. The obtained results indicated that newly adsorbent can be successfully applied for the decontamination of noxious Pb(II) and As(III) from the aqueous environment.[2]

References

[1]Modeling for CO2 Solubility in the N-(2-Hydroxyethyl) Piperazine + Water System. Front. Energy Res. 9:785039. doi: 10.3389/fenrg.2021.785039

[2]Ahmad, N.F., Kamboh, M.A., Nodeh, H.R. et al. Synthesis of piperazine functionalized magnetic sporopollenin: a new organic-inorganic hybrid material for the removal of lead(II) and arsenic(III) from aqueous solution. Environ Sci Pollut Res 24, 21846–21858 (2017). https://doi.org/10.1007/s11356-017-9820-9