CO2 capture is the key process of CCUS (carbon capture, utilization and storage). Due to the high effectivity and low cost, organic amine solution absorption is one of the most widely used CO2 capture technologies. However, in most cases, the viscosity of organic amine solution could increase as the CO2 absorption amount increase, which could significantly impact on the effect and the process of absorption. In this study, several different types of organic amines were selected as the targets, including monoethanolamine (MEA), Diethanolamine (DEA), Methyldiethanolamine (MDEA), 2-methyl-2-aminopropanol (AMP) and N-hydroxyethyl-1,2-ethylenediamine (AEEA). Meanwhile, a series of experiments were conducted to investigate the viscosity of organic amine solutions at different temperature with different concentrations and amounts of CO2 absorption. Besides, scanning electron microscope (SEM) and cryo-transmission electron microscope (Cryo-TEM) were utilized to observe the structure and aggregation of organic amine. Furthermore, the rheological properties of organic amines were tested by rheometer. Based on the experiments and observations, the phenomenon of viscosity change and the structure of organic amine molecular before/after absorption were obtained. According to the results, the main conclusions are as follows: 1. Due to the formation of spatial network structure, the steric hindrance amine shown the most obvious increase in viscosity among the target organic amines after CO2 absorption. 2. The viscosity of the primary amine solution shown the minimum change. 3. Preventing the binding of organic amines could be the most effective method to reduce the solution`s viscosity.

Phenomenon and mechanism of organic amine solution viscosity variation during CO2 capture process

Where thousands of chemistry professionals meet to share ideas and advance scientific and technical knowledge. Spring 2023 abstracts, posters, and presentations will launch at the end of March.

ACS Spring 2023

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.