scholarly journals Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

2021 ◽  
Author(s):  
Marcello Costamagna ◽  
Eleonora Micheli ◽  
Valentino Canale ◽  
Michele Ciulla ◽  
Gabriella Siani ◽  
...  
Keyword(s):  
High Pressure ◽  
Ethylene Glycol ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Effect Of Temperature ◽  
Temperature Transition ◽  
Component Mixture ◽  
Multiple Absorption ◽  
Optimized Conditions ◽  
Kinetics Of

A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO<sub>2</sub> sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity <i>via</i> Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H<sub>2</sub>O 3:1:1:3 can absorb 24 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at high pressure (10 and 20 atm, 80 g<sub>CO2</sub>/kg<sub>sorbent</sub> after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N<sub>2</sub> flow. The system is robust enough to ensure multiple absorption/desorption cycles.

scholarly journals Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

2021 ◽  
Author(s):  
Marcello Costamagna ◽  
Eleonora Micheli ◽  
Valentino Canale ◽  
Michele Ciulla ◽  
Gabriella Siani ◽  
...  
Keyword(s):  
High Pressure ◽  
Ethylene Glycol ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Effect Of Temperature ◽  
Temperature Transition ◽  
Component Mixture ◽  
Multiple Absorption ◽  
Optimized Conditions ◽  
Kinetics Of

A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO<sub>2</sub> sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity <i>via</i> Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H<sub>2</sub>O 3:1:1:3 can absorb 24 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at high pressure (10 and 20 atm, 80 g<sub>CO2</sub>/kg<sub>sorbent</sub> after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N<sub>2</sub> flow. The system is robust enough to ensure multiple absorption/desorption cycles.

scholarly journals Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

2021 ◽  
Author(s):  
Gianluca Ciancaleoni ◽  
Marcello Costamagna ◽  
Eleonora Micheli ◽  
Valentino Canale ◽  
Michele Ciulla ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Temperature Transition

Low-cost Temperature Transition Mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents

2021 ◽  
pp. 117180
Author(s):  
Marcello Costamagna ◽  
Eleonora Micheli ◽  
Valentino Canale ◽  
Michele Ciulla ◽  
Gabriella Siani ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Temperature Transition

scholarly journals Irreversible sorption of Pb(II) from aqueous solution on breadfruit peel to mitigate environmental pollution problems

2019 ◽  
Vol 80 (12) ◽  
pp. 2241-2249
Author(s):  
Namal Priyantha ◽  
Linda B. L. Lim ◽  
Nur Hakimah Mohd Mansor ◽  
Anushka B. Liyandeniya
Keyword(s):  
Environmental Pollution ◽  
Low Cost ◽  
Error Function ◽  
Isotherm Models ◽  
Artocarpus Altilis ◽  
Adsorption Mechanisms ◽  
Adsorption Sites ◽  
Pseudo Second Order ◽  
Optimized Conditions ◽  
Kinetics Of

Abstract Development of efficient and environmentally friendly methods to remove toxic pollutants from aqueous systems is a requirement to mitigate ever increasing environmental pollution problems. In this context, Artocarpus altilis (breadfruit) peel (BP), a waste material, can be used as a low-cost adsorbent for the removal of Pb(II) ions from synthetic pollutant solutions. The extent of removal of Pb(II), under optimized conditions in experimental batch experiments, is determined to be 82.0%, which is decreased in highly ionic environments, partly due to competition for a limited number of active adsorption sites, indicating the necessity of optimizing experimental parameters for the most efficient removal. Regression analysis and error function values evaluated for isotherm models associated with different adsorption mechanisms, namely Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Redlich–Peterson and Sips, indicate that the best fitted model is the Sips followed by the Langmuir model with adsorption capacities (qmax) of 78.50 mg g−1 and 85.42 mg g−1, respectively. Thermodynamics arguments support the spontaneous and exothermic behavior of the Pb(II)-BP adsorption system, while adsorption kinetics of the system provides evidence for the applicability of the pseudo second order model with a rate constant of 0.504 g mg−1 min−1.

Study on Primary Reaction Kinetics of Melamine Aminated Monomethoxylpoly (ethylene Glycol)

2012 ◽  
Vol 450-451 ◽  
pp. 374-378
Author(s):  
Zhen Li ◽  
Yan Ding ◽  
Jin Liu
Keyword(s):  
Ethylene Glycol ◽  
Reaction Kinetics ◽  
Potassium Hydroxide ◽  
Reaction Order ◽  
Average Molecular Weight ◽  
Molar Ratio ◽  
Amino Groups ◽  
Amination Reaction ◽  
Kinetics Of ◽  
Kinetics Parameter

The reaction kinetics of amination of monomethoxylpoly (ethylene glycol) (mPEG) with melamine (MA) at the molar ratio of 1:1 was studied by FTIR. This amination reaction was carried out with potassium hydroxide as reaction catalyst under high-pressure conditions at different temperature (160 °C, 170 °C, 180 °C, and 190°C) for different time (2 h, 3 h, 4 h, 5 h and 6 h). A series of melamine aminated monomethoxylpoly (ethylene glycol) (MA-mPEG) were synthesized, and the long chain of polyethylene glycol ether was grafted on the amino groups of melamine by amination. The amination kinetics parameter of reaction order and the activation energy are about 1.5 and 45 KJ/mol, respectively. In addition, the grafting amination yield increased with the number average molecular weight of mPEG at the same reaction condition.

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

Kinetics and mechanism of cyclization of N-(2-methoxycarbonylphenyl)-N’-methylsulphonamide to 3-methyl-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide

1991 ◽  
Vol 56 (8) ◽  
pp. 1701-1710 ◽  
Author(s):  
Jaromír Kaválek ◽  
Vladimír Macháček ◽  
Miloš Sedlák ◽  
Vojeslav Štěrba
Keyword(s):  
Potassium Hydroxide ◽  
Acid Catalysis ◽  
Potassium Hydroxide Solution ◽  
Hydroxide Solution ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Cyclization Kinetics ◽  
Rate Limiting ◽  
Kinetics Of

The cyclization kinetics of N-(2-methylcarbonylphenyl)-N’-methylsulfonamide (IIb) into 3-methyl-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide (Ib) has been studied in ethanolamine, morpholine, and butylamine buffers and in potassium hydroxide solution. The cyclization is subject to general base and general acid catalysis. The value of the Bronsted coefficient β is about 0.1, which indicates that splitting off of the proton from negatively charged tetrahedral intermediate represents the rate-limiting and thermodynamically favourable step. In the solutions of potassium hydroxide the cyclization of dianion of the starting ester IIb probably becomes the rate-limiting step.

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