Phase Separation Solvent for CO2 Capture

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

doi:10.1016/j.egypro.2017.03.1224

Cited by 18 publications

(15 citation statements)

References 8 publications

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“…The phase separation solvent used was the same weight ratio as the solvent suggested by Machida et al that is, EAE/DEGDEE/water = 30:60:10 (weight base). [16] The surface change of phase separation solvent is presented in Figure 6A. In Figure 6, the new peak formations are attributed to the formation of products such as amine cation and carbamate.…”

Section: Continuous Flow Results Of Phase Separation Solventmentioning

confidence: 99%

“…The phase separation solvent used was the same weight ratio as the solvent suggested by Machida et al that is, EAE/DEGDEE/water = 30:60:10 (weight base). [ 16 ]…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…Studies on CO 2 solubility and reaction heat using this phase separation solvent have been reported earlier. [ 13,15,17 ]…”

Section: Introductionmentioning

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).…”

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

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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: Continuous Flow Results Of Phase Separation Solventmentioning

confidence: 99%

“…The phase separation solvent used was the same weight ratio as the solvent suggested by Machida et al that is, EAE/DEGDEE/water = 30:60:10 (weight base). [ 16 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Studies on CO 2 solubility and reaction heat using this phase separation solvent have been reported earlier. [ 13,15,17 ]…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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