CO2 absorption kinetics in a CO2-free and partially loaded aqueous ammonia solution

Kim, Gyo Hee; Park, Sung Youl; You, Jong Kyun; Hong, Won Hi; Kim, Jong‐Nam; Kim, Jong-Duk

doi:10.1016/j.cej.2014.03.120

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…It has been found in the literature that the reaction rates increases with the temperature up to 358C and then decreases with the temperature, the overall rate is slightly affected within the range 20-358C [45]. Also to reduce the volatility of ammonia (i.e., may decrease the available concentration of reacting ammonia) the ammonia-based processes are operated in the temperature range of 15-308C [46,47]. Our results are similar to these although the systems used are different in characteristics but based on the same reaction kinetics of ammonia and CO 2 .…”

Section: Effect Of Temperaturementioning

confidence: 99%

Simultaneous removal of CO₂ and salts from saline water by a combined process

Chaalal

Hossain

2015

Env Prog and Sustain Energy

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The emission of CO2 has been increasing steadily and with the increasing demand of desalinated water (especially in Gulf Cooperation Council countries) this is expected to increase at a faster rate. CO2 removal from sour natural gas, from the water desalination power plants and similar sources is important not only to these industries but also to reduce the effect on global warming. In this study, a simple process is investigated experimentally to remove CO2 from a synthetic mixture of natural gas containing it. The method is based on the modified Solvay process and involves the chemical reaction between CO2 and ammonia in saline solution. The process can reduce CO2 by about 99% and at the same time reduce water salinity by 40%. The process is potentially much more effective than the amine scrubbing process, without the operational problems for environmental damage posed by monoethanolamine organic compounds. The innovative process shows the technical feasibility of sweetening natural gas in the laboratory‐scale operation. It can also be applied to the removal of CO2 from polluting sources like car exhaust. Simultaneous reduction of salinity is additional benefit of this process. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 250–256, 2016

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Section: Effect Of Temperaturementioning

confidence: 99%

Simultaneous removal of CO₂ and salts from saline water by a combined process

Chaalal

Hossain

2015

Env Prog and Sustain Energy

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“…However, the simulation results based on equilibrium have a large deviation from the application scenario, which is of little reference value. Kim et al 26 measured the aqueous ammonia with 0.1 CO 2 loading used by the wetted wall reactor and found that the CO 2 absorption rate of the partially loaded solution was lower than that of unloaded solution. The reason is that the concentration of OH − decreases significantly, leading to the decrease of chemical reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Absorption Kinetics of CO₂ in Aqueous Ammonia with High Load and Salinity

Fan

Chen

et al. 2023

Ind. Eng. Chem. Res.

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In order to improve the absorption efficiency of carbon dioxide (CO 2 ) in the process of inorganic ammonia carbon capture, it is critical to find out the factors inhibiting CO 2 absorption. In this work, the mass transfer flux of CO 2 is measured by a multi-column wetted wall reactor. The results indicated that the boundary concentration of NH 3 under the conditions of chemical reaction is 1.01527 kmol•m −3 . The contribution of CO 2 concentration in the liquid film to the reaction rate is found to be less than that of NH 3 . The carbonization degree is only related to pH and has nothing to do with the initial concentration of NH 3 . The decrease of absorption efficiency is related to the H + activity coefficient rather than the change of the diffusion coefficient. A flux prediction model with high load and salinity is presented subsequently. Furthermore, the two important regulation indexes are the pH and NH 4 HCO 3 saturation.

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“…However, alternative absorbents are required to overcome the drawbacks of alkanolamines and potassium carbonate. Among several alternatives, in natives, ammonia solution is attracting attention owing to their low cost, low levels of regeneration energy, little corrosion, not degradation like happened for the amines, and higher absorption capacity than the alkanolamines and potassium carbonate at the same operating temperature and pressure [13][14]. Experimental studies had been widely carried out for assessment the comparison performance between ammonia and monoethanolamine absorbents to minimize carbon dioxide had been extensively carried out systematically.…”

Section: Introductionmentioning

confidence: 99%

Absorption of Carbon Dioxide into Aqueous Ammonia Solution using Blended Promoters (MEA, MEA+PZ, PZ+ArgK, MEA+ArgK)

Al-Sudani¹

2020

ETJ

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Absorption of CO2 into promoted-NH3 solution utilize a packed column (1.25 m long, 0.05m inside diameter) was examined in the present work. The process performance of four different blended promoters monoethanolamine (MEA)+ piperazine (PZ), piperazine (PZ)+ potassium argininate (ArgK) and monoethanolamine +potassium argininate was compared with unpromoted-NH3 solution by evaluated the absorption rate (φ_(CO_2 )) and overall mass transfer coefficient (K_(G,CO_2.) a_v) over the operating ranges of the studied process variables (1-15Kpa initial partial pressure of CO2, 5-15 Liter/min gas flow rate, 0.25-0.85 Liter/min liquid flow rate). The results exhibit that the absorption behavior and efficiency can be enhanced by rising volumetric liquid ﬂow rate and initial CO2 partial pressure. However, the gas ﬂow rate should be kept at a suitable value on the controlling gas film. Furthermore, it has been observed that the (PZ+ArgK) promoter was the major species that can accelerate the absorption rate and reached almost 66.166% up to123.23% over that of the unpromoted-NH3 solution.

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CO2 absorption kinetics in a CO2-free and partially loaded aqueous ammonia solution

Cited by 13 publications

References 23 publications

Simultaneous removal of CO₂ and salts from saline water by a combined process

Simultaneous removal of CO₂ and salts from saline water by a combined process

Absorption Kinetics of CO₂ in Aqueous Ammonia with High Load and Salinity

Absorption of Carbon Dioxide into Aqueous Ammonia Solution using Blended Promoters (MEA, MEA+PZ, PZ+ArgK, MEA+ArgK)

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CO2 absorption kinetics in a CO2-free and partially loaded aqueous ammonia solution

Cited by 13 publications

References 23 publications

Simultaneous removal of CO2 and salts from saline water by a combined process

Simultaneous removal of CO2 and salts from saline water by a combined process

Absorption Kinetics of CO2 in Aqueous Ammonia with High Load and Salinity

Absorption of Carbon Dioxide into Aqueous Ammonia Solution using Blended Promoters (MEA, MEA+PZ, PZ+ArgK, MEA+ArgK)

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Product

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Simultaneous removal of CO₂ and salts from saline water by a combined process

Simultaneous removal of CO₂ and salts from saline water by a combined process

Absorption Kinetics of CO₂ in Aqueous Ammonia with High Load and Salinity