Numerical simulation of theories for gas absorption with chemical reaction

Glasscock, David A.; Rochelle, Gary T.

doi:10.1002/aic.690350806

Cited by 80 publications

(59 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All relevant reactions, which take place if CO, is absorbed in an aqueous solution of a tertiary amine, were incorporated in the flux model (reactions 1, 2, 8 and 10). Model equations and initial and boundary conditions were similar to those applied by Glasscock and Rochelle ( 1989). Numerical techniques used were identical to those applied by Versteeg et al (1989).…”

Section: Methodsmentioning

confidence: 99%

“…Among others, Pohorecki and Moniuk (1988) presented a correlation for k,,-. Glasscock and Rochelle (1989), however, showed that significant depletion of OH-at the interface may occur. In their excellent model, they took into account four reactions: the finite rate reactions, C0,-amine and C0,-OH-, and the instantaneous equilibria reactions, amine-H,O and carbonate-bicarbonate (reactions 1, 2,8 and 10).…”

Section: Oh-contributionmentioning

confidence: 97%

See 1 more Smart Citation

Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution

1990

View full text Add to dashboard Cite

The reaction of CO, with TEA, DMMEA, and DEMEA has been studied at 293, 303, 318 and 333 K. All the kinetic experiments were carried out in a stirred cell reactor operated with a flat, smooth and horizontal gas-liquid interface. A numerical method, which describes mass transfer accompanied by reversible chemical reactions, has been applied to infer rate constants from the experimental data. It is argued that the contribution of the CO, reaction with OH-to the observed reaction rate may have been overestimated in most literature on tertiary amine kinetics as serious depletion of OH-toward the gas-liquid interface usually occurs.For all the amines studied, the reaction order in amine was found to be about one for each temperature investigated. This is in good agreement with the base catalysis mechanism proposed by Donaldson and Nguyen (1980). All kinetic data could be summarized reasonably well in one BrBnsted relationship. R. J. Littel

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Oh-contributionmentioning

confidence: 97%

Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution

1990

View full text Add to dashboard Cite

show abstract

“…For unequal diffusivities Glasscock and Rochelle (1989) showed that large differences for the asymptotic enhancement factor occur between the film model and surface renewal or penetration theory, respectively. Chang and Rochelle (1982) showed that by using the square root of the diffusivity ratio in the film model, the film-and surface-renewal model give almost the same enhancement factors in the instantaneous absorption regime for the reaction A+B~C.…”

Section: Adaptation Of the Asymptotic Enhancement Factor Of Secor Andmentioning

confidence: 99%

“…As mentioned before, the results of the incorporation of the influence of the reaction on the mass transfer rate are usually presented in terms of the enhancement factor. Glasscock and Rochelle (1989) showed that, for the models mentioned, considerable differences for the numerically calculated enhancement factors could occur at identical process conditions. The differences between the penetration and surface renewal model were generally small, while the film model showed larger deviations.…”

mentioning

confidence: 99%

Approximation for the enhancement factor applicable to reversible reactions of finite rate in chemically loaded solutions

Hogendoorn

Bhat

Kuipers

et al. 1997

Chemical Engineering Science

View full text Add to dashboard Cite

Abstract--A new explicit relation is proposed for the prediction of the enhancement factor for reversible reactions of finite rate in chemically loaded solutions which also allows for unequal diffusivities. The relation for the enhancement factor is not based on an approximation of the absorption process, but is derived from a similarity which can be observed between the results of the approximation for an irreversible (1,1) order reaction given by, for example, DeCoursey (surface renewal model), and the exact numerical results. (1967) were replaced by the roots of these ratios in order to adapt the enhancement factors to the penetration theory. In general, this adaptation of the solution of Secor and Beutler gave reasonably good results, however, for some situations with unequal diffusivities deviations up to 20% were found. The results of the present approximation were for various reactions compared to the numerical enhancement factors obtained for the model based on the Higbie penetration theory. Generally, the agreement was reasonably good. Only 26 of 2187 preselected simulations (1.18%) had a deviation which was larger than 20%, while the average deviation of all simulations was 3.3%. The deviations increased for solutions with a substantial chemical loading in combination with unequal diffusivities of the components. For reactions with a kinetic order unequal to unity, the Ha number had to be multiplied by a factor, w,/,~t~ so that E, = ~fHaA in the regime 2

show abstract

“…Glasscock and Rochelle implemented the Nernst-Planck equation to take this electric potential into account [33]. They calculated the electric potential using the Henderson equation.…”

Section: Introductionmentioning

confidence: 99%

Overview of mass transfer enhancement factor determination for acidic and basic compounds absorption in water

Biard

Couvert

2013

Chemical Engineering Journal

View full text Add to dashboard Cite

Absorption or gas-liquid mass transfer is a fundamental unit operation useful in many fields, particularly gas treatment (wet scrubbing). Absorption of basic or acidic compounds, even hydrophobic, in water can be achieved successfully due to the mass transfer enhancement linked to proton transfer reactions in the liquid film. The absorption rate takes this phenomenon into account through the enhancement factor E, which depends on many parameters: nature (irreversible or reversible), kinetics and stoichiometry of the reaction, reagents and products diffusion coefficients and concentrations. This article gives an overview of the enhancement factor determination for acidic and basic compounds transfer in water. Modeling is performed for three compounds of interest, hydrogen sulfide H 2 S, methyl mercaptan CH 3 SH and ammonia NH 3 , for different scenarii to assess the influence of the pH. The results demonstrate that recombination with HO -and protonation reactions are respectively the two preponderant reactions for respectively acidic and basic compounds. They enable to reach large values of the enhancement factor at appropriated pH and to reduce the mass transfer resistance in the liquid film. Furthermore, the simulations highlight that, in many cases, knowledge of the reaction kinetics is not necessary since the reaction can be considered as instantaneous compared to mass transfer.

show abstract

Numerical simulation of theories for gas absorption with chemical reaction

Cited by 80 publications

References 30 publications

Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution

Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution

Approximation for the enhancement factor applicable to reversible reactions of finite rate in chemically loaded solutions

Overview of mass transfer enhancement factor determination for acidic and basic compounds absorption in water

Contact Info

Product

Resources

About