Development of phase separation solvent for CO2 capture by aqueous (amine + ether) solution

Machida, Hiroshi; Oba, Kazuki; Tomikawa, Takashi; Esaki, Taito; Yamaguchi, Tsuyoshi; Horizoe, Hirotoshi

doi:10.1016/j.jct.2017.05.043

Cited by 49 publications

(61 citation statements)

References 22 publications

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“…EAE 80 wt% solvent after CO 2 absorption shows chemical forms of dissolved CO 2 similar to those of rich phase in phase separation solvent: the carbamate dominates the products and the bicarbonate is negligible. [15] Therefore, pure EAE and EAE aqueous solvents at 80 and 90 wt% after carbon dioxide absorption, were used to calibrate CO 2 products in phase separation solvent during carbon dioxide absorption. As a result, the CO 2 products refer to all chemical forms of CO 2 in the solution, which means there is no discrimination among carbamate, bicarbonate, carbonate, and molecular CO 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Machida et al suggested a solvent that separates into two phases after the absorption of CO 2 ; this solvent is composed of EAE, diethylene glycol diethyl ether (DEGDEE), and water in 30:60:10 weight base (the phase separation solvent is hereafter referred to as EAE/DEGDEE/water 30:60:10 solvent). [13][14][15][16] When CO 2 is absorbed, the solvent is divided into two phases. Carbamate in Reaction (1), having low affinity toward DEGDEE, will be in a phase with water and amine after CO 2 is absorbed (CO 2 -rich phase).…”

mentioning

confidence: 99%

“…Studies on CO 2 solubility and reaction heat using this phase separation solvent have been reported earlier. [13,15,17] Traditionally, laborious and time-consuming methods involving total organic carbon (TOC) or titration, which require sampling, have been used to determine the composition of solvent for the CO 2 absorption experiment. Because of its retrospective nature, it is difficult to determine the composition of the solvent in real time during absorption, and the progress of the reaction over time requires many samplings.…”

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confidence: 99%

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Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Sato

Tran

Yamaguchi

et al. 2020

J Adv Manuf & Process

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An amine solvent that undergoes phase change after absorption of CO 2 has been studied to reduce the energy consumed during the CO 2 capture process. Depending on the components of the solvent, the CO 2-rich phase can be separated for the regeneration step or the component in CO 2-lean phase accelerates the regeneration step in the solvent that undergoes liquid-liquid phase change. Since the homogeneous solvent separates into two liquid phases after CO 2 absorption, an analysis method to track the change in chemical species during the absorption process, especially at the phase separation time, is necessary to illuminate the phenomenon. To establish an online method to analyze the components of the solvent, a Fourier-transform infrared (FT-IR) spectrometer equipped with an attenuated total reflection (ATR) probe was used during the CO 2 absorption of phase separation solvent composed of amine, ether, and water. The calibration samples of amines, ethers, and CO 2-loaded solutions were used to develop the partial least square regression model. The consumption of reactants, as well as the formation of products, can be monitored quantitatively using the FT-IR spectra. Utilizing this information, the changes in the chemical species shed light on the phase separation mechanism of this solvent: ether was pushed out of the solvent to form a CO 2-lean phase due to its hydrophobicity, while CO 2 and its products along with amine and water remain in the CO 2-rich phase. Without sampling, this rapid and high-accuracy method is suitable for closed processes, especially for a high-pressure process. K E Y W O R D S attenuated total reflection (ATR), CO 2 capture, Fourier transform infrared (FT-IR) spectroscopy, phase separation solvent 1 | INTRODUCTION Anthropogenic carbon dioxide gas emissions have been observed to be the most probable dominant cause for global warming since the mid-20th century. To suppress global warming, the Paris Agreement in 2015 has set a goal of keeping the global average temperature rise below 2 C. [1] One of the primary sources of carbon dioxide emission is flue gas from industrial sectors. To reduce CO 2 emission, carbon dioxide capture and storage (CCS) has gained extensive interest. [2] In CCS, the CO 2 is separated from the other components in flue gas at an emission source, compressed, and transported into storage. The most established technique for capturing the CO 2

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Sato

Tran

Yamaguchi

et al. 2020

J Adv Manuf & Process

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“…Our research group evaluated the phase-separation behavior of this absorbent, and CO 2 absorption. [12] EAE was converted into protonated amine and carbamate after reaction with CO 2 , and these ion species lead to phase separation after CO 2 absorption. At low CO 2 pressure (1.0-20 kPa), this absorbent separated into two liquids, with CO 2 solubility (0.3-0.5 mol -CO2 /mol -Amine ) at 313 K.…”

Section: Materials For the Phase-separation Absorbentmentioning

confidence: 99%

“…[11] The key factors affecting the phase-separation absorbent (the CO 2 loading, temperature, and CO 2 partial pressure) were identified by experiment and modeling. [12] It was shown that the input sensible heat and evaporation were drastically reduced by phase separation induced by CO 2 absorption.…”

Section: Introductionmentioning

confidence: 99%

Rate of CO₂ absorption of a phase‐separation absorbent

Esaki

Machida

Norinaga

2019

J Adv Manuf & Process

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In this study, we evaluated the CO 2 absorption characteristics of a phase-separation amine absorbent. The phase-separation absorbent consists of a 30:60:10 (by weight percent) mixture of 2-(ethylamino)ethanol, diethylene glycol diethyl ether, and water. The CO 2 absorption rate of the phase-separation absorbent was measured in a lab-scale counter flow absorber. In addition, the CO 2 transport phenomena in the absorber were analyzed by performing model fitting. The experimental results revealed that the CO 2 absorption rates are different before and after phase separation. In fact, the overall CO 2 absorption capacity coefficient after phase separation is 4.5 times higher than that obtained before phase separation. By changing the gas-liquid ratio, we obtained a CO 2 recovery ratio of over 80% using the model. Thus, the absorption temperature, CO 2 loading, and gas-liquid ratio can be tuned to obtain the desired CO 2 recovery ratio.absorption rate, carbon capture and storage, CO 2 separation, phase-separation absorbent, process modeling, transport phenomena

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Recent development in metal oxide-based core–shell material for CO2 capture and utilisation

2022

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Development of phase separation solvent for CO2 capture by aqueous (amine + ether) solution

Cited by 49 publications

References 22 publications

Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Rate of CO₂ absorption of a phase‐separation absorbent

Recent development in metal oxide-based core–shell material for CO2 capture and utilisation

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Development of phase separation solvent for CO2 capture by aqueous (amine + ether) solution

Cited by 49 publications

References 22 publications

Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Online composition analysis of phase separation solvent for carbon dioxide capture using ATR‐FT‐IR

Rate of CO2 absorption of a phase‐separation absorbent

Recent development in metal oxide-based core–shell material for CO2 capture and utilisation

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Rate of CO₂ absorption of a phase‐separation absorbent