Humid Post-combustion CO2 Capture by Vacuum Swing Adsorption Using CALF-20 PDF Download
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Author: Tran Thanh Tai Nguyen
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 0
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Book Description
Carbon capture utilization and storage (CCUS) play a crucial contribution in reducing CO2 emissions and obtaining net-zero emission by 2050. Adsorbent-based technology offers an opportunity to separate CO2 under mild regeneration conditions. However, low CO2 concentration and water vapour in the flue gas make it challenging to separate CO2. In this thesis, CALF-20, a water-stable metal-organic framework (MOF), was characterized and demonstrated for humid post-combustion CO2 capture. Single-component CO2 and N2 isotherms were measured at various pressures and temperatures using volumetric and gravimetric methods. The dual-site Langmuir model was used to describe the CO2 and N2 isotherms. The adsorption equilibrium of water was measured from 0%-100% relative humidity (RH) at various temperatures using thermogravimetry analysis and volumetric methods. A hysteresis loop was observed from 8%-22% RH. The Quadratic-Langmuir model was used to describe water isotherms. The competitive loadings of CO2 and N2 were quantified by performing both adsorption and desorption dynamic column breakthrough (DCB) experiments. The CO2 loading barely changed under the competition of N2. The adsorption and desorption DCB of water were also performed. Multiple transitions corresponding to the shape of the isotherm were observed in the water DCB curves. A one-dimensional column model, including all dispersion, convection, heat transfer and pressure drop, was used to describe the adsorption dynamic in the column. The competitive loadings of CO2 and H2O were collected using both thermogravimetry analysis and dynamic column breakthrough techniques. At RH
Author: Tran Thanh Tai Nguyen
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 0
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Book Description
Carbon capture utilization and storage (CCUS) play a crucial contribution in reducing CO2 emissions and obtaining net-zero emission by 2050. Adsorbent-based technology offers an opportunity to separate CO2 under mild regeneration conditions. However, low CO2 concentration and water vapour in the flue gas make it challenging to separate CO2. In this thesis, CALF-20, a water-stable metal-organic framework (MOF), was characterized and demonstrated for humid post-combustion CO2 capture. Single-component CO2 and N2 isotherms were measured at various pressures and temperatures using volumetric and gravimetric methods. The dual-site Langmuir model was used to describe the CO2 and N2 isotherms. The adsorption equilibrium of water was measured from 0%-100% relative humidity (RH) at various temperatures using thermogravimetry analysis and volumetric methods. A hysteresis loop was observed from 8%-22% RH. The Quadratic-Langmuir model was used to describe water isotherms. The competitive loadings of CO2 and N2 were quantified by performing both adsorption and desorption dynamic column breakthrough (DCB) experiments. The CO2 loading barely changed under the competition of N2. The adsorption and desorption DCB of water were also performed. Multiple transitions corresponding to the shape of the isotherm were observed in the water DCB curves. A one-dimensional column model, including all dispersion, convection, heat transfer and pressure drop, was used to describe the adsorption dynamic in the column. The competitive loadings of CO2 and H2O were collected using both thermogravimetry analysis and dynamic column breakthrough techniques. At RH
Author: Gang Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 422
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Book Description
VSA (Vacuum Swing Adsorption) is a promising technology for capturing CO2 which is known to contribute to global warming. Capture of CO2 from flue gas streams using adsorption processes must deal with the prospect of high humidity streams containing bulk CO2 as well as other impurities such as SOx, NOx, etc. However, most studies to date have ignored this aspect of CO2 capture. The major problem caused by water vapour is that water is a much stronger adsorbate than CO2 on most of the polar adsorbents thus drastically reducing the CO2 adsorption capacity. Although the water problem may be tackled by adding a pretreatment drier before the CO2VSA unit, this will result in a large increase of capital and operational cost. Therefore, there is a strong economic motivation to integrate the drying and CO2 recovery in a single VSA process for commercialization of CO2VSA technology.The main purpose of this project is to study the influence of water vapour on the adsorption of CO2 both in the light of fundamentals of adsorption and in the application of post-combustion carbon capture by vacuum swing adsorption experimentally and theoretically. Adsorption equilibria of a CO2/H2O binary mixture were measured on activated alumina F-200 at several temperatures and over a wide range of concentrations from 4% to around 90% relative humidity. In comparison with the single component data, the loading of CO2 was not reduced in the presence of H2O whereas at low relative humidity the adsorption of H2O was depressed. The binary system was described by a competitive/cooperative adsorption model where the readily adsorbed water layers acted as secondary sites for further CO2 adsorption via hydrogen bonding or hydration reactions. The combination of kinetic models namely a Langmuir isotherm for characterizing pure CO2 adsorption and a BET isotherm for H2O was extended to derive a binary adsorption equilibrium model for the CO2/H2O mixture. Models based on the ideal adsorbed solution theory of Myers and Prausnitz failed to characterize the data over the whole composition range and a large deviation of binary CO2/H2O equilibrium from ideal solution behavior was observed. The extended Langmuir-BET (LBET) isotherm, analogous to the extended Langmuir equation, drastically underestimated the CO2 loading. By incorporating the interactions between CO2 and H2O molecules on the adsorbent surface and taking into account the effect of nonideality, the realistic interactive LBET (R-LBET) model was found to be in very good agreement with the experimental data. In contrast, CO2 adsorption on zeolite 13X was entirely depressed at higher water humidity. Direct modification of 13X by silanes increased the hydrophobicity of the adsorbent but also reduced CO2 uptake.A laboratory-scale VSA apparatus was constructed and used to experimentally examine the capture of CO2 from a 10-12% synthetic flue gas stream over a range of water relative humidity. Breakthrough experiments with a binary CO2/H2O mixture in a near-adiabatic double layered 3A/13X column showed a peculiar dual roll-up phenomenon. Water adsorption generated a pure thermal wave which traveled ahead of the water concentration front and swept off the readily adsorbed CO2 leading to a thermal induced roll-up; the slow propagation of the water concentration wave displaced the CO2 by competitive adsorption resulting in n equilibrium induced roll-up. Cyclic VSA experiments with single layered 13X column and multilayered Al2O3/13X column configurations were conducted. The migration of the water and its subsequent impact on capture performance was evaluated. The formation of a water zone creates a "cold spot" which has implications for the system performance. Although the concentration of water leaving the bed under vacuum was high, the low vacuum pressure prevented condensation of this stream. The vacuum pump acted as a condenser and separator to remove bulk water. An important consequence of the presence of a water zone was to elevate the vacuum level thereby reducing CO2 working capacity. On the other hand, the internal purge of CO2 was found to be of critical importance to lower the water partial pressure during evacuation. The penetration of water in the column could be managed by keeping an appropriate volumetric purge-to-feed ratio or a higher vacuum level. This effect was predicted by our axial adiabatic working capacity model. At relatively high water content (> 4% v/v) in the feed, the use of a water prelayer was essential to prevent failure of the system. The overall performance of the VSA with wet feed decreased slightly compared with the performance for dry feed. Reasonable results have been achieved for a triple layered single column VSA in the case with the highest feed humidity of 8.5% v/v, with a product CO2 recovery of 58.2%, purity 52.4% and productivity 0.128 kg CO2/h/L adsorbent. Further scale-up of this process by using multi-columns and a more sophisticated cycle design is expected to further improve the performance. Thus although there is a detrimental effect of water on CO2 capture, long term recovery of CO2 is still possible in a single VSA process.
Author: Augustine Ntiamoah
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 147
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Author: Mohammad Reza Rahimpour
Publisher: Woodhead Publishing
ISBN: 0128227583
Category : Science
Languages : en
Pages : 574
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Book Description
Advances in Carbon Capture reviews major implementations of CO2 capture, including absorption, adsorption, permeation and biological techniques. For each approach, key benefits and drawbacks of separation methods and technologies, perspectives on CO2 reuse and conversion, and pathways for future CO2 capture research are explored in depth. The work presents a comprehensive comparison of capture technologies. In addition, the alternatives for CO2 separation from various feeds are investigated based on process economics, flexibility, industrial aspects, purification level and environmental viewpoints. - Explores key CO2 separation and compare technologies in terms of provable advantages and limitations - Analyzes all critical CO2 capture methods in tandem with related technologies - Introduces a panorama of various applications of CO2 capture
Author: Bishan Meghani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Qiang Wang
Publisher: Royal Society of Chemistry
ISBN: 1788011090
Category : Science
Languages : en
Pages : 318
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Book Description
An introduction to the different inorganic adsorbents/sorbents used in post-combustion carbon dioxide capture.
Author: Paul Feron
Publisher: Woodhead Publishing
ISBN: 0081005156
Category : Technology & Engineering
Languages : en
Pages : 816
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Book Description
Absorption-Based Post-Combustion Capture of Carbon Dioxide provides a comprehensive and authoritative review of the use of absorbents for post-combustion capture of carbon dioxide. As fossil fuel-based power generation technologies are likely to remain key in the future, at least in the short- and medium-term, carbon capture and storage will be a critical greenhouse gas reduction technique. Post-combustion capture involves the removal of carbon dioxide from flue gases after fuel combustion, meaning that carbon dioxide can then be compressed and cooled to form a safely transportable liquid that can be stored underground. - Provides researchers in academia and industry with an authoritative overview of the amine-based methods for carbon dioxide capture from flue gases and related processes - Editors and contributors are well known experts in the field - Presents the first book on this specific topic
Author: Christin Patzschke
Publisher:
ISBN:
Category :
Languages : en
Pages : 698
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Book Description
Adsorption-based methods, such as pressure swing adsorption (PSA) or vacuum swing adsorption (VSA), are promising for capturing CO2 from natural gas or flue gas. CO2 adsorbents take a variety of forms, but one approach is the use of metal-organic frameworks (MOFs). These have attracted tremendous attention over the past decade due their porosity, high surface area, high pore volume, tuneable pore sizes and topologies. Previous studies on adsorbents of this type, such as CPO-27(Mg), HKUST-1, MOF-177 or MIL-101, have reported good CO2 adsorption capacities. Moreover, through introducing specific polar groups onto the organic linker or by grafting components onto coordinatively unsaturated sites (CUS) of specific MOFs, increases in the CO2 affinity have been observed, particularly at low pressure. This project investigated the potential of MOFs for post-combustion carbon capture and high pressure separation processes. Two classes of MOFs were chosen:1)MOFs containing CUS, which allow further postsynthetic modification (PSM) by grafting/impregnating these materials with amines.2)Flexible MOFs, due to their good selectivities and high CO2 capacities.Enhanced CO2 capacities were sought by two approaches or a combination of both: (i) prefunctionalisation of MIL-53 and MIL-101 (where substituent groups are incorporated into the linker unit before MOF construction) and (ii) postsynthetic modification (PSM) of MIL-100 and MIL-101 (where substituents like ethylenediamine (ED), diethylenetriamine (DETA), 2nd generation polypropylenimine actamine dendrimer (DAB-AM-8) and polyethyleneimine (PEI) are added after MOF construction).
Author: Hellmut G. Karge
Publisher: Springer Science & Business Media
ISBN: 3540739661
Category : Science
Languages : en
Pages : 411
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Book Description
"Molecular Sieves - Science and Technology" covers, in a comprehensive manner, the science and technology of zeolites and all related microporous and mesoporous materials. The contributions are grouped together topically in such a way that each volume deals with a specific sub-field. Volume 7 treats fundamentals and analyses of adsorption and diffusion in zeolites including single-file diffusion. Various methods of measuring adsorption and diffusion are described and discussed.
Author: Zhengyi Liu
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 153
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Book Description
In this work, mesoporous cellular foams (MCFs) were synthesized and impregnated with different weight percentage of polyethylenimine (PEI) using wet impregnation method. The synthesized adsorbents were characterized using nitrogen adsorption/desorption, SEM, TEM, and FTIR analysis. The CO2 adsorption capacity of PEI-impregnated MCFs was measured using thermogravimetric analyzer (TGA). The effects of PEI loadings, adsorption temperatures, and CO2 partial pressures on CO2 adsorption performance using PEI-impregnated MCFs were explored. 70 wt % PEI loading was found to be the optimum for the highest CO2 adsorption capacity of about 5 mmol/g in 95% CO2/5% N2 gas mixture and 4 mmol/g in 10% CO2/90% N2 gas mixture, at 75 °C. The effect of moisture on the CO2 adsorption performance in simulated flue gases was studied. It was found the CO2 adsorption performance of PEI-impregnated MCFs can be improved with the presence of moisture, especially at low adsorption temperatures. The adsorbent with optimum PEI loading was then tested for multi-cycle stability and adsorption/desorption kinetics in both humid and dry conditions. Good stability of the adsorbent in multi-cycle tests was found as no significant change in CO2 adsorption capacity was observed. Various equilibrium adsorption isotherms, such as Langmuir and Freundlich adsorption isotherms, were applied to describe the CO2 adsorption behavior. Different kinetic models were developed to study the CO2 adsorption kinetics of this type of adsorbents. John-Mehl-Avrami (JMA) model was found to be well fitted with the experimental data, indicating another possible way to describe the kinetics of CO2 adsorption process under isothermal conditions. The heat of adsorption of CO2 adsorption process using PEI-impregnated MCFs was also calculated.
