scholarly journals Triacetoneamine-derivates (EvAs) for CO2-absorption from Process Gases

2021 ◽  
Author(s):  
Elmar Kessler ◽  
Luciana Ninni ◽  
Dan Vasiliu ◽  
Amir Yazdani ◽  
Benjamin Willy ◽  
...  
Keyword(s):  
Energy Demand ◽  
Ring Structure ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Foaming Behavior ◽  
Cut Method ◽  
Rate Of Absorption ◽  
Process Gases ◽  
Improved Performance ◽  
Solid Liquid

New amines for reactive absorption of CO2 from process gases were investigated in a comprehensive experimental screening. All studied amines are derivates of triacetoneamine and differ only in the substituent of the triacetoneamine ring structure. The amines are abbreviated by the acronym EvA with a consecutive number, designating the derivate. About 50 EvAs were considered in this work from which 26 were actually synthesized and investigated in aqueous solution.The following properties were studied: solubility of CO2, rate of absorption of CO2, liquid–liquid and solid–liquid equilibrium, foaming behavior, dynamic viscosity, and acid constants. The nine most promising EvAs were evaluated with the NoVa short-cut method (Vasiliu et al., 2020). The method yields estimates for the specific energy demand and recirculation rate for a given purification task. Two typical purification tasks were considered: the CO2-removal from natural gas and from synthesis gas, respectively. Some of the EvAs showed significantly improved performance compared to monoethanolamine (MEA) and a solvent-blend of methyl-diethanolamine and piperazine (MDEA/PZ).

scholarly journals CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 496
Author(s):  
Sayali Ramdas Chavan ◽  
Patrick Perré ◽  
Victor Pozzobon ◽  
Julien Lemaire
Keyword(s):  
Hollow Fiber ◽  
Recovery Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Fiber Membrane ◽  
Residual Content ◽  
Membrane Contactors ◽  
Ph Swing

Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

scholarly journals Greenhouse heating by using an installation of biomass gasification

2019 ◽  
Vol 112 ◽  
pp. 03026
Author(s):  
Evelin Laza ◽  
Liliana Dumitrescu ◽  
Madalina Boboc ◽  
Georgiana Moiceanu
Keyword(s):  
Conversion Efficiency ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Forest Biomass ◽  
Chemical Conversion ◽  
Biomass Gasification ◽  
Physical Processes ◽  
High Conversion Efficiency ◽  
Solid Liquid ◽  
Rapid Pyrolysis

The use of renewable energies has seen a significant increase in energy demand in agriculture, in competition with solid, liquid or gaseous fossil fuels. Wood and other forms of biomass including energy crops, agricultural and forest biomass are transformed into energy through thermal, biological or physical processes. Thermo-chemical conversion, biomass gasification, is the most attractive technology that offers a high conversion efficiency compared to direct burning or rapid pyrolysis.

scholarly journals Atomic-scale design of radiation-tolerant nanocomposites

MRS Bulletin ◽  
2010 ◽  
Vol 35 (12) ◽  
pp. 992-998 ◽  
Author(s):  
M. J. Demkowicz ◽  
P. Bellon ◽  
B. D. Wirth
Keyword(s):  
Energy Demand ◽  
Oxide Dispersion Strengthened ◽  
Clean Energy ◽  
Extreme Environment ◽  
Atomic Scale ◽  
Nanostructured Composite ◽  
Improved Performance ◽  
Defect Interactions ◽  
Scale Design ◽  
Radiation Tolerant

Recent work indicates that materials with nanoscale architectures, such as nanolayered Cu-Nb composites and nanoscale oxide dispersion-strengthened steels, are both thermally stable and offer improved performance under irradiation. Current understanding of the atomic-level response of such materials to radiation yields insights into how controlling composition, morphology, and interface-defect interactions may further enable atomic-scale design of radiation-tolerant nanostructured composite materials. With greater understanding of irradiation-assisted degradation mechanisms, this bottom-up design approach may pave the way for creating the extreme environment—tolerant structural materials needed to meet the world's clean energy demand by expanding use of advanced fission and future fusion power.

scholarly journals Amine-based Carbon Dioxide Absorption: The Ionic Strength Effect on the Monoethanolamine Protonation Constant at Temperatures from 313 to 333K

2020 ◽  
Vol 19 (2) ◽  
pp. 83
Author(s):  
Sholeh Ma'mun ◽  
Panji Kumala Setiawan ◽  
Egip Indrayanto
Keyword(s):  
Carbon Dioxide ◽  
Ionic Strength ◽  
Protonation Constant ◽  
Acid Dissociation ◽  
Reactive System ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Pka Values ◽  
Ionic Strength Effect ◽  
Strength Effect

Amine-based absorption has been extensively used for carbon dioxide (CO2) removal processes, such as CO2 absorption from flue gas as well as from natural gas. As a reactive system in which the chemical reaction, as well as mass transfer, occur simultaneously, an experimental determination of equilibrium reaction constants, e.g. acid dissociation/protonation constant (Ka), is, therefore, necessary to be conducted. This study aims to evaluate the ionic strength effect from 0.06 to 6.0 m (mol/kg water) on the Ka value of monoethanolamine (MEA) at temperatures between 313 and 333K. The experimental results indicate that the pKa values tend to be increasing as the ionic strength increases. This is contradicting to the temperature effect where the pKa values tend to be decreasing as the temperature increases. Furthermore, the extended Debye-Hückel formulation was implemented to predict the species activity coefficients.

scholarly journals Optimized Simulation of CO2 Removal Process from Coal Fired Power Plants with MEA by Sensitivity Analysis in Aspen plus

2017 ◽  
Vol 11 (2) ◽  
pp. 191 ◽  
Author(s):  
Ruth Nataly Echevarria Huamán
Keyword(s):  
Energy Consumption ◽  
Process Model ◽  
Aspen Plus ◽  
Optimum Operating ◽  
Design Parameters ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Capture Process ◽  
Desorption Process ◽  
Optimum Operating Condition

The World Energy consumption has been increasing steadily since industrialization, this recent increase is also the major cause for the raise of CO2 concentration in the atmosphere. Fossil fuels play a central role in our energy consumption; actually the CCS technology and their operations in power systems must get a prominent role in reducing total CO2 emissions. An attempt to tackle the problem of solvent based Post Combustion Carbon Capture process optimization requires the availability of a rigorous process model along with a design methodology. During the modeling, much physical and chemical process should be considered in order to get more realistic results, this complexity process addressed as Reactive Separation. This report presents detailed descriptions of the process sections as well as technical documentation for the ASPEN Plus simulations including the design basis, models employed, key assumptions, design parameters, convergence algorithms, concentration and temperature profiles and calculated outputs. The main purpose is to minimize the amount of energy required in the desorption process through the optimum operating condition to the actual CO2 absorption experimental setup. The case of study is on MEA 30wt% in a coal Hired power plant. Electrolytic method is considered; the sensitive analysis was used for the Optimization.

scholarly journals Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

2020 ◽  
Vol 95 ◽  
pp. 102932 ◽  
Author(s):  
Elmar Kessler ◽  
Luciana Ninni ◽  
Dan Vasiliu ◽  
Amir Yazdani ◽  
Benjamin Willy ◽  
...  
Keyword(s):  
Co2 Absorption ◽  
Process Gases

scholarly journals Mass Transfer Performance Study for CO2 Absorption into Non-Precipitated Potassium Carbonate Promoted with Glycine Using Packed Absorption Column

2020 ◽  
Vol 12 (9) ◽  
pp. 3873
Author(s):  
Nur Farhana Ajua Mustafa ◽  
Azmi Mohd Shariff ◽  
Wee Horng Tay ◽  
Hairul Nazirah Abdul Halim ◽  
Siti Munirah Mhd Yusof
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Removal Efficiency ◽  
Potassium Carbonate ◽  
Elevated Pressure ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Absorption Column ◽  
Co2 Removal Efficiency

The removal of carbon dioxide (CO2) at offshore operation requires an absorption system with an environmentally friendly solvent that can operate at elevated pressure. Potassium carbonate promoted with glycine, PCGLY, is a green solvent that has potential for offshore applications. For high solvent concentrations at elevated pressure, the by-product of CO2 absorption consists of precipitates that increase operational difficulty. Therefore, this study was done to assess the CO2 absorption performance of non-precipitated PCGLY with concentration 15wt%PC+3wt%GLY, which is known to have comparable solubility performance with MDEA. A packed absorption column was used to identify the CO2 removal efficiency, mass transfer coefficient in liquid film, k l a e , and overall volumetric mass transfer coefficient, K G a v . A simplified rate-based model was used to determine k l a e and K G a v based on the experimental data with a maximum MAE value, 0.057. The results showed that liquid flow rates and liquid temperature gives significant effects on the k l a e and K G a v profile, whereas gas flow rate and operating pressure had little effect. The CO2 removal efficiency of PCGLY was found to be 77%, which was only 2% lower than 1.2 kmol/m3 MDEA. K G a v of PCGLY is comparable with MDEA. The absorption process using PCGLY shows potential in the CO2 sweetening process at offshore.

Analysis of CO2 Capture From Power-Plant Flue Gas Using the Membrane Gas Absorption (MGA) Method

2015 ◽  
Author(s):  
Zhien Zhang ◽  
Yunfei Yan ◽  
Junlei Wang ◽  
Li Zhang ◽  
Yanrong Chen ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Operating Conditions ◽  
Gas Absorption ◽  
Optimum Operating ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Capture Process ◽  
Gas Concentration ◽  
Liquid Concentration

Currently membrane gas absorption (MGA) is a novel approach for gas separation. In the present work, a wide-ranging 2D mathematical model for CO2 absorption from the N2/CO2 mixture is proposed. Single solvents [H2O, ethylenediamine (EDA), diethanolamine (DEA), monoethanolamine (MEA), piperazine (PZ)] and blended solvents [DEA/PZ] were used as the absorbents. The non-wetting mode for the membrane contactor was considered in the calculations. The effects of gas concentration and velocity, and liquid concentration and velocity on CO2 removal were observed. The simulation results were verified with the experimental data showing a good agreement. The modeling results indicate that gas concentration and velocity have a negative effect on the capture process, while liquid concentration and velocity enhance CO2 capture. Also, it is noted that PZ has the best absorption performance than other single absorbents. The chemical solvents are much better than the physical solvent for the absorption of CO2. For mixed absorbents based on amine solutions, the CO2 removal efficiency could be about 20% higher than that of the single solutions. Thus, this model could provide the optimum operating conditions for acid gas absorption in the hollow fiber membrane module. It is also proved that the MGA approach exhibits a good potential in power-plant waste gas purification.

scholarly journals Speciation in CO2-loaded aqueous solutions of sixteen triacetoneamine-derivates (EvAs) and elucidation of structure-property relationships

2021 ◽  
Author(s):  
Elmar Kessler ◽  
Luciana Ninni ◽  
Tanja Breug-Nissen ◽  
Benjamin Willy ◽  
Rolf Schneider ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Spectroscopic Study ◽  
Mass Fraction ◽  
Chemical Structure ◽  
Ring Structure ◽  
Important Influence ◽  
Co2 Absorption ◽  
Structure Property ◽  
Structure Property Relationships

The speciation in CO2-loaded aqueous solutions of 16 different derivates of triacetoneamine (EvAs) was investigated in a comprehensive NMR-spectroscopic study. About 350 experiments were carried out for CO2-loadings up to 3 moles CO2 per mole amine, temperatures between 20 °C and 100 °C, and a mass fraction of EvA in the unloaded solvent of 0.1 g/g. The observed CO2-containing species were primary and secondary carbamates, alkylcarbonate, (bi)carbonate, and molecular CO2. Some EvAs can form zwitterions with a ring structure, which have an important influence on the speciation. From the comprehensive set of data, relationships between the chemical structure of the EvAs and the observed speciation in aqueous solution were established. These results were related to application properties of the EvAs that were taken from previous work. Based on the findings, some general guidelines for the design of new amines were derived and applied for proposing new amines for CO2-absorption.

scholarly journals CONDITION OF SUBSTANCE SEARCH ALGORITHM FOR SOLVING REACTIVE POWER PROBLEM

2017 ◽  
Vol 5 (9) ◽  
pp. 230-245
Author(s):  
K. Lenin
Keyword(s):  
Reactive Power ◽  
Search Algorithm ◽  
Test System ◽  
Optimal Reactive Power Dispatch ◽  
Paper Condition ◽  
Improved Performance ◽  
Solid Liquid ◽  
Exploration Exploitation ◽  
Power Problem ◽  
Evolutionary Progression

In this paper, Condition of Substance Search (COS) algorithm is introduced to solve optimal reactive power dispatch problem. The Condition of Substance Search (COS) algorithm is based on the simulation of the shape of substance incidence. In Condition of Substance Search (COS) algorithm, individuals follow molecules which interrelate to each other by using evolutionary operations which are based on the corporal principles of the thermal-energy motion mechanism. The algorithm is developed by considering each condition of substance in harmony with different exploration–exploitation ratio. The evolutionary progression is alienated into three phases which emulate the three condition of substance: solid, liquid & gas. This technique can considerably improve the equilibrium between exploration–exploitation, however preserving the high-quality search ability of an evolutionary approach. The proposed Condition of Substance Search (COS) algorithm has been tested on standard IEEE 30 bus test system and simulation results show clearly the improved performance of the projected Condition of Substance Search (COS) algorithm in reducing the real power loss and voltage stability also enhanced.

Sign in / Sign up

Export Citation Format

Share Document