Kinetics of carbon dioxide binding by 1,1,3,3-tetramethylguanidine in 1-hexanol

Öztürk, Mustafa Çağdaş; Orhan, Özge Yüksel; Alper, Erdoğan

doi:10.1016/j.ijggc.2014.04.023

Cited by 34 publications

(21 citation statements)

References 38 publications

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“…1.58 equivalents of TMG (from 5 possible) were converted into carbamates, as determined by weighing the mass of CO 2 uptake and considering the fraction converted into carbonates. This result is supported by the work of Ozturk et al 19 who performed a kinetic study of the reaction between CO 2 , TMG and 1-hexanol, with the formation of a carbamate intermediate product (reaction with TMG), stabilized by the alcohol. The authors proposed two alternative products: TMGCO 2 -+ TMGH + + hexanol and the other configuration HexCO 3 -+ TMGH + + hexanol.…”

Section: Figuresupporting

confidence: 59%

CO₂ capture systems based on saccharides and organic superbases

et al. 2015

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In this report, novel systems, based on highly abundant saccharides, D-mannose, D-glucose, β-cyclodextrin, alginic acid and mannitol, in combination with an organic superbase, tetramethylguanidine (TMG) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), are studied for carbon dioxide capture. With D-mannose and D-glucose, several ratios of equivalents of alcohol groups of saccharide : superbase were tested: 1, 0.625, 0.5 and 0.25. High wt% values of CO2 uptake were obtained with TMG-based systems. However, TMG itself can react directly with CO2, and, in the presence of D-mannose, competition between carbonate and carbamate based products was established. In order to circumvent this competition and obtain exclusively the carbonate-based product, DBU was used instead as an organic superbase. In the D-mannose series the highest result was obtained with a D-mannose : DBU ratio eq. = 0.625 (13.9% CO2 uptake, 3.3/5 alcohol groups converted into carbonates). A more effective stirring system, designed to overcome the high viscosity of the products, allowed the use of a D-glucose : DBU = 1 : 1 ratio with 11.5 wt% of CO2 uptake and 2.47/5 alcohol groups converted into carbonates. Additionally a DSC thermal study was performed in order to study the stability/reversibility of the CO2 loaded systems.

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Section: Figuresupporting

confidence: 59%

CO₂ capture systems based on saccharides and organic superbases

et al. 2015

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“…Orhan et al found that the termolecular mechanism is appropriate by applying theoretical DFT calculations. Ozturk et al have done a considerable amount of work with nonaqueous reactive solvents and found that the termolecular mechanism fitted data well. Ume et al studied an aqueous blend of amine solutions of N ‐(2‐hydroxethyl) piperazine and 2‐amino‐2‐hydroxymethyl‐1,3‐propanediol by using a termolecular reaction mechanism and achieved good results.…”

Section: Reaction Mechanism and Kinetics Modelsmentioning

confidence: 99%

A comparative kinetics study of CO₂ absorption into aqueous DEEA/MEA and DMEA/MEA blended solutions

et al. 2017

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The kinetics of CO2 absorption into aqueous solutions of N,N‐diethylethanolamine (DEEA), and N,N‐dimethylethanolamine (DMEA), and their blends with monoethanolamine (MEA) have been studied in a stopped‐flow apparatus. The kinetics experiments were carried out at the concentrations of DEEA and DMEA varying from 0.075 to 0.175 kmol/m3, respectively, and that of MEA ranging between 0.0075 and 0.0175 kmol/m3, over the temperature range of 293–313 K. Two kinetics models are proposed to interpret the reaction in the blended amine systems and the results show that the model which incorporates the base‐catalyzed hydration mechanism and termolecular mechanism resulted in a better prediction. Furthermore, the kinetics behaviors of CO2 absorption into two blended systems are comprehensively discussed according to their molecular structures. It can be concluded that the interaction between tertiary amines and primary amines as well as the alkyl chain length of tertiary amines have a significant influence on the kinetics. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1350–1358, 2018

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“…These are the zwitterions mechanism, originally proposed by Caplow in 1968, and then reintroduced by Danckwerts in 1979 and termolecular reaction mechanism proposed by Crooks and Donnellan (1989) and modified by Ozturk et al (2014).…”

Section: Discussionmentioning

confidence: 99%