A Study on CO₂ Absorption Kinetics by Aqueous Solutions of N,N‐Diethylethanolamine and N‐Ethylethanolamine

Abstract

N-Ethylethanolamine (EEA) and N,N-diethylethanolamine (DEEA) represent promising candidate alkanolamines for CO 2 removal from gaseous streams, as they can be prepared from renewable resources. In this work, the reaction rate constant for the reaction between CO 2 and EEA was determined from the absorption rate measurements of CO 2 in a blend comprising DEEA, EEA and H 2 O. A stirred-cell reactor with a plane, horizontal gas-liquid interface was used for the absorption studies. While the DEEA concentration in the formulated solution was varied in the range of 1.5-2.5 kmol/m 3 , the initial EEA concentration was 0.1 kmol/m 3 . A zwitterion mechanism for EEA and a base-catalyzed hydration mechanism for DEEA were used to describe the reaction kinetics. At 303 K, the second-order reaction rate constant for the CO 2 reaction with EEA was found to be 8041 m 3 /(kmol s). The liquid-side mass transfer coefficient was also estimated, and its value (0.004 cm/s) is in line with those typical of stirred-cell reactors.

Kinetics of carbon dioxide chemical absorption into cyclic amines solutions

“…8. The diffusion coefficient for each cyclic amine ( D B ) in aqueous solution has been calculated by means of the Wilke‐Chang equation26 modified by Hayduk and Laudie27 (Eq. 9).…”

Determination of Kinetics in Gas-Liquid Reaction Systems. An Overview

“…It can also be used in gas-liquid-solid reactions, where the solid is a reactant. A considerable amount of kinetic studies is available in the literature with the use of this apparatus [3,[11][12][13][14][15].…”

Concurrently Delivering and Retrieving Multicast Data in Parallel Channels for Mobile Users

“…Some methods are classified as push-based techniques, where the users are passive listeners and the server assumes a prior client access patterns that does not change during the course of broadcast. Based on this assumption, the server repeatedly broadcast a set of selected data items [3][4][5][6]. Alternatively, the dynamic and adaptive methods, also called pull-based methods, assume the clients' access patterns are either unknown in advance or changes relatively frequently during the course of broadcast.…”