A Kinetics Study on the Absorption of Carbon Dioxide into a Mixed Aqueous Solution of Methyldiethanolamine and Piperazine

Zhang, Xu; Zhang, Chengfang; Qin, Shu-Jun; Zheng, Zhi-Sheng

doi:10.1021/ie000956i

Cited by 128 publications

(97 citation statements)

References 13 publications

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“…At this point the material was cooled to room temperature, partitioned between chloroform and 10% NaOH, and then the organic phase was washed with deionized water and saturated sodium chloride and dried over anhydrous potassium carbonate. After filtration, solvent was removed on a rotary evaporator yielding 71.2 g (84%) crude product which was purified by fractional distillation at [130][131][132][133][134][135] o C/0.18-0.25 mm Hg. 40 3-bis(iodomethyl) -1,1,3,3-tetramethyldisiloxane (25) 1,3-Bis(chloromethyl)-1,1,3,3tetramethyldisiloxane 24 (20.0 g, 173 mmols RCl) was combined with acetone (80mL) and sodium iodide (39.0 g, 260 mmol).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

“…It is assumed that a secondary amine transfers CO 2 to the tertiary amine. 130,131 For the system AMP -PZ reacting with CO 2 , a hybrid reaction rate model including a second-order reaction for the reaction of CO 2 with PZ and a zwitterion mechanism for the reaction of CO 2 with AMP has been proposed. 132 Compared with commonly used β-amino alcohols, aqueous α-amino amides have been found to exhibit comparable or better reversible absorption capacity of carbon dioxide.…”

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confidence: 99%

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Novel High Capacity Oligomers for Low Cost CO2 Capture

Perry¹,

Grocela-Rocha²,

O’Brien³

et al. 2010

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The novel concept of using a molecule possessing both physi-sorbing and chemi-sorbing properties for post-combustion CO2 capture was explored and mixtures of aminosilicones and hydroxyterminated polyethers had the best performance characteristics of materials examined. The optimal solvent composition was a 60/40 blend of GAP-1/TEG and a continuous bench-top absorption/desorption unit was constructed and operated. Plant and process models were developed for this new system based on an existing coal-fired power plant and data from the laboratory experiments were used to calculate an overall COE for a coal-fired power plant fitted with this capture technology. A reduction in energy penalty, from 30% to 18%, versus an optimized 30% MEA capture system was calculated with a concomitant COE decrease from 73% to 41% for the new aminosilicone solvent system. 3 Executive SummaryThe novel concept of using a molecule possessing both physi-sorbing and chemi-sorbing properties for post-combustion CO2 capture was explored. A variety of candidate materials with physi-sorbing backbones and chemically reactive peripheral groups were considered with the final selection primarily focusing on aminosilicones. A small effort was also devoted to derivatized plant oils.None of the plant oil derivatives were effective in absorbing CO2 in laboratory experiments. Model reactions suggest that both intra-molecular H-bonding between adjacent hydroxyl and amino groups and potential micelle formation suppressed reactions with CO2. This route was abandoned in favor of the aminosilicones.A variety of aminosilicones with differing architectures and type and placement of amine groups were examined both experimentally and computationally for physical properties as well as CO2 capture efficacy. Modeling indicated that the heat reaction of sterically hindered amines with CO2 was lower than for unhindered amines and that less basic amines also decreased the heat of reaction. This provided options to tune the heat of reaction for optimal plant performance. Physical property predictions were also made for viscosity, vapor pressure, density and CO2 solubility. Limited experimental data confirmed the accuracy of the density and solubility models as well as trend predictability in heats of reaction. However, viscosity predictions were not accurately modeled and vapor pressure data was unavailable.Synthetically, GEN 1 aminosilicone solvents with linear, branched, cyclic and star architectures were made that possessed mono and di-amine groups while other solvent candidates had varying degrees of steric hindrance. Oligomers as well as discrete small molecules were prepared and evaluated. These included solvents with covalently bound polyether units. CO2-capture experiments were performed using both high throughput screening (HTS) techniques as well as small-scale laboratory testing. Mass transfer issues prevented the HTS methodology from being as useful as anticipated. However, efficient mixing on the lab-scale provided reliable data. These experiment...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Novel High Capacity Oligomers for Low Cost CO2 Capture

Perry¹,

Grocela-Rocha²,

O’Brien³

et al. 2010

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“…PZ was acted as a promoter to activate the MDEA to absorb CO 2 . The reaction of CO 2 and PZ was in parallel with the reaction of CO 2 with MDEA in the condition of rapid pseudo-first-order reaction 6 .…”

Section: Intermolecular Interaction Of Amine With Co 2 For Pure and Bmentioning

confidence: 99%

“…But there are some disadvantages of using MEA solution which cause high heat of absorption due to formation of stable carbamate leading to high energy consumption for solvent regeneration in the stripper. Other amines have also been suggested for this application such as 2-amino-2-methyl-1-propanol (AMP) 4 , diglycolamine (DGA), and piperazine (PZ) 5,6,7 . Sartori et al 8 proposed the use of sterically hindered amines, because of their high absorption capacity and high absorption rate.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamic simulation of CO2 absorption into mixed aqueous solutions MDEA/PZ

Harun

Masiren

2017

Chem. Eng. Res. Bull.

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Abstract:The mixture of amine absorption process is an approach for mitigation of carbon dioxide (CO 2 ) from flue gas that produces from power plant. Several experimental and simulation studies have been undertaken to understand this process but the mechanism of CO 2 absorption into the aqueous blended amines such as MDEA/PZ is not well understood and available knowledge within the open literature is limited. The aim of this study is to investigate the intermolecular interaction of the blended MDEA/PZ using Molecular Dynamics (MD) simulation. MD simulation was run under condition 313 K and 1 atm. The thermodynamic ensemble used were 200 ps for NVE and 1 ns for NVT. The periodic boundary is used to visualize the interaction of molecules of the whole system. The simulation method also involved calculation of force field and time integration algorithm.The results were interpreted in terms of Radial Distribution Function (RDF) analysis. It was observed that the hydroxyl group (-OH) of MDEA is more attracted to water molecule compared to amino group (-NH) of MDEA. The intermolecular interaction probability of -OH and -NH group of MDEA with CO 2 in blended MDEA/PZ is higher than using pure MDEA. This finding shows that PZ molecule act as an activator to promote the intermolecular interaction between MDEA and CO 2 .Thus, blend of MDEA with PZ is expecting to increase the absorption rate of CO 2 and reduce the heat regeneration requirement.

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CO₂ removal by single and mixed amines in a hollow‐fiber membrane module—investigation of contactor performance

2014

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This work investigates CO2 removal by single and blended amines in a hollow‐fiber membrane contactor (HFMC) under gas‐filled and partially liquid‐filled membrane pores conditions via a two‐scale, nonisothermal, steady‐state model accounting for CO2 diffusion in gas‐filled pores, CO2 and amines diffusion/reaction within liquid‐filled pores and CO2 and amines diffusion/reaction in liquid boundary layer. Model predictions were compared with CO2 absorption data under various experimental conditions. The model was used to analyze the effects of liquid and gas velocity, CO2 partial pressure, single (primary, secondary, tertiary, and sterically hindered alkanolamines) and mixed amines solution type, membrane wetting, and cocurrent/countercurrent flow orientation on the HFMC performance. An insignificant difference between the absorption in cocurrent and countercurrent flow was observed in this study. The membrane wetting decreases significantly the performance of hollow‐fiber membrane module. The nonisothermal simulations reveal that the hollow‐fiber membrane module operation can be considered as nearly isothermal. © 2014 American Institute of Chemical Engineers AIChE J, 61: 955–971, 2015

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A Kinetics Study on the Absorption of Carbon Dioxide into a Mixed Aqueous Solution of Methyldiethanolamine and Piperazine

Cited by 128 publications

References 13 publications

Novel High Capacity Oligomers for Low Cost CO2 Capture

Novel High Capacity Oligomers for Low Cost CO2 Capture

Molecular dynamic simulation of CO2 absorption into mixed aqueous solutions MDEA/PZ

CO₂ removal by single and mixed amines in a hollow‐fiber membrane module—investigation of contactor performance

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A Kinetics Study on the Absorption of Carbon Dioxide into a Mixed Aqueous Solution of Methyldiethanolamine and Piperazine

Cited by 128 publications

References 13 publications

Novel High Capacity Oligomers for Low Cost CO2 Capture

Novel High Capacity Oligomers for Low Cost CO2 Capture

Molecular dynamic simulation of CO2 absorption into mixed aqueous solutions MDEA/PZ

CO2 removal by single and mixed amines in a hollow‐fiber membrane module—investigation of contactor performance

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Product

Resources

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CO₂ removal by single and mixed amines in a hollow‐fiber membrane module—investigation of contactor performance