Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal

Shoukat, Usman; Baumeister, Eva; Pinto, Diego Di Domenico; Knuutila, Hanna

doi:10.1016/j.jngse.2018.11.025

Cited by 23 publications

(26 citation statements)

References 41 publications

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“…Moreover, alcohol derivatives were easily oxidized in an oxygen-containing environment, leading to a more severe degradation. 8 Thus, organic solvents, for example sulfolane (SFL), N-methyl-2-pyrrolidone (NMP) and poly (ethylene glycol) dimethylether (NHD), with high thermal stability and low vapor pressure were selected to form water-lean systems. SFL, NMP, and NHD based solvents can help lower the high viscosity of water-lean solvents to a certain extent [9][10][11] A relatively low viscosity (3.93 mPa•S) was achieved for the water-lean DETA/SFL solvent at a CO 2 loading of 2.21 mol•L -1 (equal to 1.105 mol CO 2 •mol amine -1 ) at 348 K. 9 7m MEA mixed with NMP and H 2 O in a mass ratio of NMP: H 2 O of 19:1 (equal to 3.5wt.…”

mentioning

confidence: 99%

Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity

Yang

Xia

et al. 2021

Greenhouse Gases

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The industrial application of emerging water-lean solvents to CO 2 capture from flue gas is challenged by their high viscosity. In this work, we report a novel water-lean CO 2 solvent which possesses lower viscosity and higher CO 2 cyclic capacity than other water-lean solvents reported in the literature. The new solvent consists of N, N-dimethyl-1, 2-ethanediamine (DMEDA), physical cosolvent N-methyl-2-pyrrolidone (NMP) and up to 15% water (named ENH). We evaluated the effect of the solvent composition on the viscosity, CO 2 cyclic capacity and regeneration energy of ENH and compared it with the reference monoethanolamine (MEA) based solvents. It was found that ENH containing 5% H 2 O (ENH-5%H 2 O) with a CO 2 loading of 0.767 mol CO 2 •mol amine -1 had a viscosity of 7.603 mPa•S at 40 ˚C, which was comparable with that of traditional blended amines. Excellent cyclic capacity performance was also observed, with ENH-5% H 2 O showing a 140% improvement compared to aqueous MEA. Regeneration energy of ENH-5% H 2 O was estimated to be 2.418 GJ•tCO 2 -1 which is 36% lower than the 30 wt. % aqueous MEA solvent.

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confidence: 99%

Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity

Yang

Xia

et al. 2021

Greenhouse Gases

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“…MDEA and CO 2 chemical weight (%) were also quantified by using titration [15,30,31] while ion chromatography (IC) was also used to measure the concentration of amine. Complete experimental details on amine thermal degradation are presented in our previous works [15,38]. The IC analyses of amine samples confirmed that the titration quantified the MDEA within ±3 wt%.…”

Section: Thermal Degradationmentioning

confidence: 59%

ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends

2019

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A Fourier transform infrared (FTIR) spectroscopy method was developed to identify and quantify various components in an amine-based combined acid gas and water removal process. In this work, an attenuated total reflectance (ATR) probe was used. A partial least-squares (PLS) regression model was also developed using up to four components (methyl diethanolamine (MDEA)-H2O-CO2-ethylene glycol/triethylene glycol (MEG/TEG)), and it was successfully validated. The model was applied on thermally degraded CO2-loaded MDEA blends to predict the weight percentages of MDEA, H2O, CO2, and MEG or TEG to test the performance spectrum. The results confirmed that FTIR could be used as a simpler, quicker and reliable tool to identify and quantify various compounds such as MDEA, MEG/TEG, H2O and CO2 simultaneously in a combined acid gas and water removal process.

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“…34 1,2,4,5MIm was comparable to less aggressive amines regarding Cr, Fe and Ni corrosion. 34 Polyalkylated imidazoles with longer alkyl chains are expected to be better corrosion inhibitors than 2,4,5MIm or 1,2,4,5MIm because of lower aqueous solubility. 43 The increased free energy of adsorption for these imidazoles would improve metal surface coverage.…”

Section: Corrosionmentioning

confidence: 82%

“…In general, less degradation of the imidazoles was observed compared to amines studied in similar manner. 34,40 Because imidazoles do not form carbamates, carbamate polymerization does not occur, contributing to the stability of the imidazoles. The thermal stability of alkylimidazoles with longer chain lengths are expected to be comparable to the imidazoles studied here.…”

Section: Thermal Degradation In the Presence Of Co2mentioning

confidence: 99%

Degradative Behavior and Toxicity of Alkylated Imidazoles

Evjen

Åstrand

Gaarder

et al. 2019

Ind. Eng. Chem. Res.

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The thermal and oxidative degradation behavior, as well as the corrosiveness of imidazole (Im), 2-methylimidazole (2MIm), 2-ethyl-4-methylimidazole (2E4MIm), 2,4,5-trimethylimidazole (2,4,5MIm) and 1,2,4,5-tetramethylimidazole (1,2,4,5MIm) were investigated in CO2 rich environment. The imidazoles demonstrated high thermal stability in all solutions; however, Im and 2MIm were corrosive. Polyalkylated imidazoles were less stable towards oxidation compared to Im. Rat cell (PC-12) toxicology screening of Im and 45 alkylated imidazoles showed reduced toxicity for polyalkylated imidazoles compared to Im. Cell viability correlated negatively with cLogP predictions when cLogP > 3. The high rate of oxidative degradation and formation of potentially carcinogenic degradation products will prevent the use of polyalkylated imidazoles in industrial processes directed towards CO2.Syverin Lierhagen is acknowledged for running ICP-MS experiments. Susana Villa Gonzalez is recognized for obtaining LC-HRMS spectra. Torun Margareta Melø is thanked for helping to develop the NMR method.

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Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal

Cited by 23 publications

References 41 publications

Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity

Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity

ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends

Degradative Behavior and Toxicity of Alkylated Imidazoles

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Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal

Cited by 23 publications

References 41 publications

Diamine based water‐lean CO2 solvent with extra high cyclic capacity and low viscosity

Diamine based water‐lean CO2 solvent with extra high cyclic capacity and low viscosity

ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends

Degradative Behavior and Toxicity of Alkylated Imidazoles

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Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity

Diamine based water‐lean CO₂ solvent with extra high cyclic capacity and low viscosity