H₂S absorption with deep eutectic solvents: Low partial pressure capture and thermodynamic analysis

Abstract

In the present work, a series of deep eutectic solvents (DESs) based on organic amine as hydrogen bond acceptors (HBAs), and ethylene glycol (EG) as hydrogen bond donor (HBD) were prepared for the H 2 S absorption. Thermal decomposition temperature, HBA mass ratios, alkalinity and structure effect on absorption behavior were systematically investigated. The reaction mechanism was demonstrated by FT-IR and 1 H NMR spectroscopy. The reaction equilibrium constants, Henry constant, enthalpy and entropy change were calculated based on the thermodynamic model to reveal the interactions between DESs and H 2 S. It was found that H 2 S absorption capacities of the most of DESs with HBA/HBD mass ratio of 1:4 was close to 1 mol/mol at 303.15 K and 0.2 bar. The absorption capacity of DESs depends on the alkalinity and structure of HBAs; Additionally, a good linear correlation between the alkalinity of HBA and the absorption equilibrium constant (lnK) of DESs to H 2 S was found.

Investigation of the cooperative-effects of Lewis- and Brønstedt acids in homogeneously catalyzed OME fuel synthesis by inline-NMR monitoring

“…This corresponds with results obtained in literature in which pure ZnCl 2 showed almost no conversion at considerably higher temperatures. 46…”

Experiment and microscopic analysis for the separation of isopropanol‐water using hydrophobic deep eutectic solvents

“…Wang et al 26 explored the use of ethylene glycol as an HBD and different types of organic amines for the synthesis of different DESs for adsorption of H 2 S gas. Hydrogen bonding and acid–base interactions between organic amines and H 2 S play major roles in the adsorption process, and the basicity and structural characteristics of HBA are key factors affecting the adsorption of H 2 S by DES.…”