Removal of Heat‐Stable Salts from Lean Amine of a Gas Refinery via Electrodialysis

Kikhavani, Tavan; Mehdizadeh, Hamid; Bruggen, Bart Van der; Bayati, Behrouz

doi:10.1002/ceat.202000375

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Most studies devoted to the electromembrane purification of alkanolamines from TSSs were performed on heterogeneous ion-exchange membranes. However, the use of homogeneous ion-exchange membranes, as shown in [101] using the example of an MDEA solution, can reduce the energy consumption for the process by 50% while increasing the TSS yield by 30% and reducing the concentrate volume by 40%. This is due to the higher current efficiency for homogeneous membranes as compared to heterogeneous ones [102].…”

Section: Membrane Technologies To Improve Efficiency Of Amine Co 2 Purificationmentioning

confidence: 99%

Membrane Technologies for Decarbonization

Alent’ev

Волков

Воротынцев

et al. 2021

Membr. Membr. Technol.

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The deteriorating environmental situation has stimulated the world community to develop research related to the decarbonization of the economy and hydrogen energy. These two areas are essentially focused on membrane technologies, which play a crucial role in solving key tasks for these areas. This review is devoted to this research. The first part describes various membrane technologies aimed at capturing CO 2 from the most common gas mixtures, primarily containing nitrogen, methane, and hydrogen. In recent years, studies related to the amine purification of CO 2 , including membrane technologies, and the use of porous membranes filled with ionic liquids has also been intensively developed. Electromembrane technologies are also being developed that allow not only capture of CO 2 but also to process it into fuel or valuable chemicals. The course taken by several developed countries, including Russia, for the development of hydrogen energy includes the production, purification of hydrogen, and its conversion into energy. It should be noted that membrane technologies are fundamentally important for the development of each of these areas. Thus, the evolution of hydrogen is possible with the use of polymer membranes, and for deep purification and production of high-purity hydrogen by membrane catalysis; membranes based on palladium alloys are used. Finally, fuel cells are developed to produce energy from hydrogen, the most important part of which are proton or oxygen-conducting membranes.

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Section: Membrane Technologies To Improve Efficiency Of Amine Co 2 Purificationmentioning

confidence: 99%

Membrane Technologies for Decarbonization

Alent’ev

Волков

Воротынцев

et al. 2021

Membr. Membr. Technol.

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“…There are several potentially applicable industrial methods for HSS removal for the reclamation of amine CO 2 solvents. These methods include thermal distillation [ 17 ], ion exchange [ 18 , 19 ], and electrodialysis [ 20 , 21 , 22 ]. Comparatively new methods for extracting HSS have also been proposed: nanofiltration for preliminary concentration of HSS [ 23 ], as well as novel direct liquid-liquid extraction with hydrophobic organic extractants (Aliquat ® 336—ionic liquid, quaternary ammonium base dissolved in aliphatic alcohols) [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

et al. 2023

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Amine CO2 solvents undergo oxidative degradation with the formation of heat stable salts (HSS). These HSS reduce the sorption capacity of amines and lead to intense corrosion of the equipment. In our work, we propose a membrane-supported liquid-liquid extraction of the HSS from alkanolamines. For this purpose, a hollow fiber membrane contactor was used for the first time. A lab-scale extraction system on the basis of a hollow-fiber liquid-liquid membrane contactor with hollow fiber ultrafiltration polyvinylidenefluoride and polysulfone membranes has been studied. The extraction of the HSS-ions from a 30 wt.% solution of monoethanolamine was carried out using a 0.25–1 M solution of OH-modified methyltrioctylammonium chloride in 1-octanol as an extractant. It has been shown that >90% of HSS ions can be extracted from the alkanolamine solvent within 8 h after extraction. The results obtained confirm the possibility of using membrane extraction with a liquid-liquid membrane contactor for the reclaiming of amine CO2 solvents to increase the general efficiency of carbon dioxide capture.

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“…There have been a number of review studies focused on the existing HSS removal methods [12][13][14]. The common method for solvent reclaiming from HSS is distillation [8,17], though alternative techniques exist and include-removal of HSS anions using ion-exchange resins [18,19], capacitive deionization [20,21], concentration of HSS using nanofiltration [22,23], and electromembrane treatment methods [24][25][26]. Direct and bipolar electrodialysis are applicable for treating MEA-based post-combustion CO 2 capture solvents [27][28][29][30][31][32] and diethylamine recovery with simultaneous acid production [33,34].…”

Section: Introductionmentioning

confidence: 99%

Perstraction of Heat-Stable Salts from Aqueous Alkanolamine Solutions

et al. 2022

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Amine absorption processes designed to remove acid gases from gas streams generally face a major challenge of solvent degradation. This degradation leads to the formation of heat-stable salts (HSS), corrosive agents that irreversibly bind free alkanolamine. The present study proposes, for the first time, a method for HSS perstraction using a liquid–liquid membrane contactor that allows HSS to transfer through porous membranes from the solvent into a hydrophobic extractant represented by a methyltrioctylammonium solution in 1-octanol. The perstraction provides selective extraction of HSS anions without direct mixing of liquid phases or the formation of stable emulsions of the solvent and the extractant. For this purpose, a number of industrial and laboratory porous membrane samples fabricated from polyvinylidene fluoride, polypropylene, and polysulfone were investigated. Their chemical and morphological stability, surface properties, and transport properties were tested under prolonged (>600 h) contact with a model solvent (an aqueous monoethanolamine solution) and with the components of the selective extractant. The feasibility of HSS perstraction was demonstrated using the formic acid (as an HSS model) extraction from the model solvent. The most promising results were obtained for a system with a polyvinylidene fluoride membrane: up to 50% of formic acid was extracted over 18 h.

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Removal of Heat‐Stable Salts from Lean Amine of a Gas Refinery via Electrodialysis

Cited by 10 publications

References 30 publications

Membrane Technologies for Decarbonization

Membrane Technologies for Decarbonization

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

Perstraction of Heat-Stable Salts from Aqueous Alkanolamine Solutions

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