MINERALS ENGINEERING
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2025
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IF 5
Panxing Zhao,Wenbao Liu,Wengang Liu,Lingyun Bao,Yanbai Shen,Stephen Butt,Yahui Zhang
Removal of quartz from hematite by reverse flotation using cationic collectors is an effective approach for iron concentrate upgrading. In this paper, three hydroxyl-containing cationic collectors, i.e., N-Dodecylethanolamine (NDEA), N-Dodecylpropanolamine (NDPA), and N-Dodecylbutanolamine (NDBA), were synthesized and characterized. The flotation performance and the structure-performance relationship of the collectors were systematically investigated by micro-flotation experiments and various surface analysis techniques. At the concentration of 20 mg/L, the flotation recoveries of quartz by NDEA, NDPA, and NDBA were 94.9 %, 93.5 %, and 93.3 %, respectively. Collectors with shorter hydroxyl-substituted carbon chains exhibited stronger collecting ability and enhanced hydrophobicity of quartz surface, as confirmed by contact angle measurements. Zeta potential measurements and molecular simulations revealed that the collectors adsorb onto the quartz surface through electrostatic and hydrogen bonding interactions. The introduced hydroxyl groups could enhance the formation of hydrogen bonds between collectors and mineral surface. However, as the carbon chain length increases, the adsorption area of a single collector on the mineral surface increases, the number of collector molecules adsorbed per unit area decrease, reducing the collecting ability of the collector for quartz. This research could provide theoretical guidance for the design of novel cationic collectors.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
AICHE JOURNAL
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2018
·Vol. 64
·期 7
·2515-2525
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IF 3.326
Helei Liu,Moxia Li,Xiao Luo,Zhiwu Liang,Raphael Idem,Paitoon Tontiwachwuthikul
In this work, Diethanolamine (DEA) was considered as an activator to enhance the CO 2 capture performance of Monoethanolamine (MEA). The addition of DEA into MEA system was expected to improve disadvantages of MEA on regeneration heat, degradation, and corrosivity. To understand the reaction mechanism of blended MEA-DEA solvent and CO 2 , 13 C nuclear magnetic resonance (NMR) technique was used to study the ions (MEACOO - , DEACOO – , MEA, DEA, MEAH + , DEAH + , , ) speciation in the blended MEA-DEA-CO 2 -H 2 O systems with CO 2 loading range from 0 to 0.7 mol CO 2 /mol amine at the temperature of 301 K. The different ratios of MEA and DEA (MEA: DEA = 2.0:0, 1.5:0.5, 1.0:1.0, and 0:2.0) were studied to comprehensively investigate the role of DEA in the system of MEA-DEA-CO 2 -H 2 O. The results revealed that DEA performs the coordinative role at the low CO 2 loading and the competitive role at high CO 2 loading. Additionally, the mechanism was also proposed to interpret the reaction process of the blended solvent with CO 2 . © 2018 American Institute of Chemical Engineers AIChE J , 64: 2515–2525, 2018
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2018
·
IF 3.024
XiangFeng Tian,LeMeng Wang,Dong Fu,Chao Li
The absorption performance of low-partial-pressure H2S in a monoethanolamine (MEA)-activated N-methyldiethanolamine (MDEA) aqueous solution was investigated. The absorption amount (in mass, g H2S/g solutions) and H2S loadings (mol H2S/(mol MEA + mol MDEA)) were measured, and the apparent absorption rate was determined from the time-dependent absorption capacity. Experimentally, the temperature and partial pressure of H2S (PH2S) ranged from 303.2 to 323.2 K and from 300 to 500 Pa, respectively. The mass fractions of MDEA (wMDEA) and MEA (wMEA) ranged from 0.30 to 0.50 and from 0 to 0.075, respectively. The temperature, wMDEA, wMEA, and PH2S dependencies of the absorption performance were analyzed. It is impressive that the addition of MEA significantly enhanced the absorption amount of H2S yet slightly influenced the apparent absorption rate. In addition, a tray column consisting of six plates was used to verify the removal efficiency of low-partial-pressure H2S (PH2S = 500 Pa) and the results showed that in the case of wMDEA = 0.5, wMEA = 0.075, and T = 313.2 K, the removal efficiency achieved 95% when the ratio of gas to liquid was 40, indicating that MEA-activated MDEA aqueous solutions are promising in the removal process of low-partial-pressure H2S.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Sini Xiao,Helei Liu,Hongxia Gao,Min Xiao,Xiao Luo,Raphael Idem,Paitoon Tontiwachwuthikul,Zhiwu Liang
The stopped-flow technique was applied on the measurement of the kinetics of carbon dioxide (CO 2 ) absorption into aqueous blends of monoethanolamine (MEA) and diethanolamine (DEA) over the temperature range of 293–313 K. The investigation of blended MEA + DEA with various molar ratios of DEA to MEA revealed that the reaction mechanism between CO 2 and blended absorbents could be different at different ratio of DEA to MEA. Consequently, the kinetic data obtained in this work was split into two groups with respect to the different molar ratios of DEA to MEA in order to study the different mechanisms. In group A, the concentration of MEA was in the range of 5–15 mol/m 3 and the concentration of DEA was low (varied between 5 and 15 mol/m 3 ), while in group B, the DEA concentration was high (varied between 140 and 240 mol/m 3 ) and the concentration of MEA remained in the range of 5–15 mol/m 3 . Modified models based on the termolecular mechanism were developed for each group and used to interpret the experimental kinetic data. Results showed that the models could explain the data well with an AAD of 4.71% for group A at low concentration of DEA and 3.33% for group B at high concentration of DEA. It is interesting to point out that DEA barely reacts with CO 2 at low molar ratios (i.e. group A) whereas at high DEA concentration (i.e. group B), both MEA and DEA reacted with CO 2 .
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2019
·
IF 3.021
Chongchong Lu,Ming Chen,Xiao Luo,Zhiwu Liang
In order to be able to understand and compensate for the mass transfer effects on the reaction kinetics that typically occur in these studies, the influences of diffusion and gas phase resistance on the measurement of kinetics have been investigated. Carbon dioxide (CO2) absorption into monoethanolamine (MEA) and N-methyldiethanolamine (MDEA) have been taken as the fast and slow reaction cases in this work. The inflection point between diffusion control and reaction control regions was found in the fast reaction case but not in the slow one. Further, there is a low critical value of Pinert, below which its effect can be ignored, in the fast reaction system. Conversely, the critical value of Pinert in the slow reaction system is higher. Additionally, credible intrinsic kinetics of the both systems have been obtained under optimum conditions, expanding the temperature range to lower than what is available in the literature.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
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IF 3.412
Huipei Liang,Xiaoli Qin,Chin Ping Tan,Daoming Li,Yonghua Wang
Docosahexaenoyl and eicosapentaenoyl ethanolamides (DHEA and EPEA) have physiological functions, including immunomodulation, brain development, and anti-inflammation, but their efficient production is still unresolved. In this study, choline-chloride-based natural deep eutectic solvents are used as media to improve the production of DHEA and EPEA. The water content showed a key effect on the reactant conversion. Adding water to choline chloride–glucose (CG, molar ratio of 5:2) led to a significant increase (13.03% for EPEA and 27.95% for DHEA) in the yields after 1 h. The high yields of EPEA (96.84%) and DHEA (90.06%) were obtained under the optimized conditions [fish oil ethyl esters/ethanolamine molar ratio of 1:2, temperature of 60 °C, 1 h, enzyme loading of 2195 units, and CG containing 8.50% water of 43.30% (w/w, relative to total reactants)]. The products could be easily separated using centrifugation. In summary, the research has the potential to produce fatty acyl ethanolamides.
研究领域:
化学工程
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生物化学
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生物技术
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DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
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2024
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IF 2.8
Nan He,Yukun Zhang,Fenhong Song,Jing Fan,Xiwu Zhang
Deep eutectic solvents (DESs) have appealed increasing research interest across various scientific and industrial applications, notably in relation to efforts in CO 2 capture. This study presents a novel series of DESs were synthesized on the basis of monoethanolamine (MEA) and N-methyldiethanolamine (MDEA) as hydrogen bond donors with tetrabutylammonium bromide (TBAB) and tetrabutylphosphine bromide (TBPB) salt as hydrogen bond acceptors. A gas solubility measurement experimental system based on pressure drop method has been established to evaluate the solubility of CO 2 in amine-based deep eutectic solvents. The evaluation was performed over a temperature range of 303.15 to 323.15 K and a pressure range of 100 to 1000 kPa. The results indicated that as the molar ratio of hydrogen bond donors increases, the solubility of CO 2 in DESs increases, while it was found to be less affected by the hydrogen bond acceptor. Of these, the solubility of CO 2 is strongest at a 1:10 molar ratio of TBAB and MEA. The nuclear magnetic resonance spectroscopy spectra (NMR) and FTIR spectroscopy revealed that the MEA-based DES mixture primarily exhibited chemical absorption of CO 2 , while the MDEA-based DES predominantly showed physical dissolution of CO 2 . In addition, it was observed that both temperature and pressure significantly influenced the CO 2 solubility, and a successful correlation was developed using different semi-empirical models.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2019
·
IF 3.021
Hao Ling,Sen Liu,Tianyu Wang,Hongxia Gao,Zhiwu Liang
To get a more accurate mass transfer coefficient model of CO2 into aqueous monoethanolamine (MEA)/N,N-dimethylethanolamine (DMEA) solution in a packed column, the Henry’s law constant, equilibrium CO2 solubility, volumetric overall mass transfer coefficient (KGav), overall gas-phase mass transfer coefficient (KG), and effective gas–liquid interfacial area (av) were comprehensively studied. The Henry’s law constant was obtained using a jacketed stirred glass reactor, and the equilibrium CO2 solubility was investigated using a bubbling absorption reactor. Additionally, the mass transfer performance was measured and evaluated experimentally in a packed column with DX-Type structured packing in terms of KGav, KG, and av. These experiments were conducted under the MEA/DMEA concentration of 6 kmol·m–3 with ratio of 5:1. The dynamic changes of solubility, species concentration, and absorption heat of solution were analyzed under different CO2 loadings. The experimental results showed that the relationship of successive absorption without synergistic effect from the perspective of equilibrium state for the MEA/DMEA solution and the blended MEA/DMEA solution can reduce the CO2 absorption heat compared to that of MEA solution. Furthermore, a predicted model of KGav, which should be suitable for different solution systems with DX-Type structured packings in a packed column, was also proposed and developed based on the KG model and av model in this work.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Zheng Zhao,Xiaochun Chen,Muhammad Furqan Ali,Ahmed A. Abdeltawab,Sobhy M. Yakout,Guangren Yu
A series of ethanolamine based deep eutectic solvents (DESs), which have strong basicity, were firstly applied in wheat straw pretreatment. Typically, choline chloride: monoethanolamine (C:M) as the best solvent among these DESs can remove 71.4% lignin and reserve 93.7% cellulose (70 °C, L/S mass ratio of 20:1, 9 h), and improve the enzymatic hydrolysis of residue, i.e., 89.8% cellulose and 62.0% xylan conversion. The pretreatment capacity of C:M is comparable to other solvents while C:M has several advantages, e.g., lower cost with cheap materials and simpler preparation process, mild conditions and lower polysaccharide loss. The XRD, SEM and FT-IR results verified that the polysaccharide conversion and sugars yield were enhanced by the removal of lignin in the pretreatment process. The basic ethanolamine based DESs are promising solvents for industrial application of wheat straw pretreatment.
研究领域:
生物技术
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化学工程
·
生化工程
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
·
IF 2.004
Xiaopo Wang,Kai Kang,Wei Wang,Yuansi Tian
Experimental density data of the binary mixtures of 3-(methylamino)propylamine with water, N-methyldiethanolamine, N,N-dimethylethanolamine and N,N-diethylethanolamine were reported at atmospheric pressure over the entire composition range at temperatures from (283.15 to 363.15) K. The densities were measured using an Anton Paar digital vibrating U-tube densimeter. Excess molar volumes of the mixture were calculated from the experimental densities and correlated as the Redlich–Kister equation. The optimized sets of parameters of the equation were obtained by the least-squares method at each temperature. Infinite dilution partial molar volumes and the corresponding excess partial molar volumes at infinite dilution were calculated and discussed. Thermal expansivities for the binary mixtures were presented.
研究领域:
物理化学
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热力学
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化工
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DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jiaqi Liu,Meiyan Hang,Minghui Jiang,Guangfei Xu,Hongbin Song
In this research, aiming to deal with the accelerated corrosion deterioration of steel reinforcement in reinforced concrete in harsh environments, a highly efficient rust inhibitor (triethanolamine (TEA)-triisopropanolamine (TIPA)) (abbreviated as TT), which TEA and TIPA compounded in a ratio 4:6, was proposed. The synergistic rust inhibition effect of TEA and TIPA on steel in the simulated concrete pore solution (SCPS), and its corrosion inhibition performance were investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), dry and wet cycling, and scanning electron microscopy (SEM) measurements. The results showed that TT inhibitor could obviously inhibit the corrosion of steel in the SCPS and could inhibit both cathode and anode. The electrochemical corrosion inhibition performance was the most excellent at the dosage of 1.0 %, and the maximum corrosion inhibition efficiency ( η 1 ) reached 95.39 %. After 150 times of dry and wet cycling, the percentage of the corrosion area ( S ), and corrosion inhibition efficiency ( η 2 ) with 1.0 % TT inhibitor were 9.3 % and 84.03 %, respectively, and the mass loss rate ( M ) decreased by 68.4 %, indicating a better rust inhibition performance. The adsorption of the TT inhibitor conformed to the Langmuir adsorption isotherm and inhibited the corrosion of steel by forming a protective film on steel surface through physicochemical adsorption. This study is of great significance to provide new perspectives and improvement measures to build up the deterioration and extend the service life of reinforced concrete in harsh environments.
研究领域:
土木工程
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材料科学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Qiushi Jiang,Yanjing Li,Minmin Wang,Wen Cao,Xueying Yang,Sihu Zhang,Liejin Guo
This study investigated the mediating effect of Triethanolamine on Fe@C- Rhodobacter sphaeroides hybrid photosynthetic system to achieve efficient biohydrogen production. The biocompatible Fe@C generates excited electrons upon exposure to light, releasing ferrum for nitrogenase synthesis, and regulating the pH of the fermentation environment. Triethanolamine was introduced to optimize the electron transfer chain, thereby improving system stability, prolonging electron lifespan, and facilitating ferrum corrosion. This, in turn, stimulated the lactic acid synthetic metabolic pathway of Rhodobacter sphaeroides , resulting in increased reducing power in the biohybrid system. The ternary coupling system was analyzed through the regulation of concentration, initial pH, and light intensity. The system achieved the highest total H 2 production of 5410.9 mL/L, 1.29 times higher than the control (2360.5 mL/L). This research provides a valuable strategy for constructing ferrum-carbon-based composite-cellular biohybrid systems for photo-fermentation H 2 production.
研究领域:
微生物学
·
可再生能源
·
光合作用
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）