Adsorption Equilibria Hydrocarbon Gas Mixtures.

Lewis, W. K.; Gilliland, E. R.; Chertow, B.; Cadogan, W. P.

doi:10.1021/ie50487a022

Cited by 125 publications

(62 citation statements)

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“…Among these fundamental data, the equilibrium adsorption isotherms and the internal diffusion coefficients of individual species of the mixture should be emphasized. Although substantial attention has been paid in the literature to the adsorp tion isotherms of pure compounds and their mixtures, even to the point of predicting multicomponent adsorption equilibria (Lewis et al, 1950 shown that the adsorption rates of pure propane, n-butane, ibutane, l-butene and other light gases into molecular sieves were lower when these compounds were present in binary mixtures. Feng et al (1973Feng et al ( ,1974 have extensively studied the diffusion of gaseous mixtures inside the pores of solid adsorbents, using several diffusion models.…”

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confidence: 99%

Adsorption of gaseous hydrocarbons on activated carbon: Characteristic kinetic curve

1985

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The internal diffusion coefficients, Di, of pure methane, ethane and ethylene as well as some of their binary and ternary mixtures, have been calculated at 20°C for solid particles of a commercial activated carbon. It has been observed that the contribution of the surface migration mechanism to the global mass transfer process inside the adsorbent particles can be as much as 7040%. Values for the surface migration coefficient Ds have also been calculated from the relation Di = Dg + KD,, where K is a dimensionless mean slope factor. Values found for both coefficients are of the same order of magnitude as those reported in the literature for similar systems.All the values for the internal diffusion coefficients of these pure components and their mixtures fit into a single correlation curve, the characteristic kinetic curve of the adsorbent. SCOPEThe increasing importance of adsorption processes for the separation of gaseous mixtures is due to the high selectivity and adsorption capacity of solid adsorbents, the less extreme operation conditions needed, and the small energy consumption required. Adsorption is becoming a competitive operation that can advantageously substitute for other separation operations such as distillation or liquid-liquid extraction. The advantages are especially attractive when the problem is the separation of light gases such as methane, ethane, ethylene and other typical hydrocarbons of gaseous refinery streams, since their separation by distillation requires expensive high pressure units.Although there are some commercial processes for the separation of hydrocarbons using gas adsorption (Milton, 1963; Priegnitz, 1973; Yatsurugi, 1974;Broughton, 1977), the extension of this method to other cases of practical interest is generally limited by the lack of reliable fundamental data for estimating the feasibility of a given separation and for reducing the empiricism of the present design of adsorbers. Among these fundamental data, the equilibrium adsorption isotherms and the internal diffusion coefficients of individual species of the mixture should be emphasized. Although substantial attention has been paid in the literature to the adsorp tion isotherms of pure compounds and their mixtures, even to the point of predicting multicomponent adsorption equilibria (Lewis et al., 1950 shown that the adsorption rates of pure propane, n-butane, ibutane, l-butene and other light gases into molecular sieves were lower when these compounds were present in binary mixtures. Feng et al. (1973Feng et al. ( ,1974 have extensively studied the diffusion of gaseous mixtures inside the pores of solid adsorbents, using several diffusion models. Their results, which were achieved by assuming a single pore size for the adsorbent and a reasonable tortuosity factor, were erroneous for not considering surface migration. We present here new values for the internal diffusion coefficients of methane, ethane, and ethylene, both as pure components and as part of the mixtures of methane-ethylene, ethaneethylene, and methane...

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confidence: 99%

Adsorption of gaseous hydrocarbons on activated carbon: Characteristic kinetic curve

1985

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“…A summary of the general rate models based on the Fick's law can be found in the review of Xu et al (2013), with special devotion to pore diffusion model (PDM) (Du et al 2008), homogeneous surface diffusion model (HSDM) (Tien 1994) and pore and surface diffusion model (PSDM) (Liu et al 2010). However, the main limitation to solve the general rate models is a timeconsuming and computationally troubled work.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…When the monolayer capacities of both adsorbates are very different, the equation to use obeys a power series (Frey and Rodriges 1994; Le Van and Vermeulen 1981). Lewis et al (1950) showed how for a bicomponent mixture at constant pressure (P = P 1 + P 2 ) the following relation between the amounts adsorbed of each component (W 1 and W 2 ) is fulfilled (Lewis equation):…”

Section: Adsorption Equilibrium Models For Multicomponent Systemsmentioning

confidence: 99%

A Critical Short Review of Equilibrium and Kinetic Adsorption Models for VOCs Breakthrough Curves Modelling

Valenciano

Aylón

Izquierdo

2015

Adsorption Science & Technology

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Volatile organic compounds emission has important effects over the environment and human beings health. When these substances cannot be substituted, adsorption systems are still a very common solution to VOCs emission, but for their design, previous laboratory work is necessary: adsorption isotherms and breakthrough curves must be obtained. The first ones establish the maximal amount of adsorbate retained over the solid adsorbent for a certain pressure of the adsorbate, and the second ones define the adsorption process kinetics. Once this information is studied, a theoretical breakthrough time model can be built up, and then the scale up of the adsorption system can be developed. This process is rather complex for multicomponent gas mixtures, where a competition between adsorbates happens. Thus, the aim of this paper is to establish a guide for authors willing to develop breakthrough time prediction models for multicomponent systems through a critical review of different adsorption and kinetic models.

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“…An adsorption study of various hydrocarbon gas mixtures indicated that one will usually be adsorbed in preference to the others, 3 and the gas preferentially adsorbed will be the one for which the carbon has the highest capacity when the gases are adsorbed separately. In a homologous series of hydrocarbons, carbon has a tendency to adsorb larger amounts of those gases with the highest molecular weight.…”

Section: Activated Carbon Carbon Characteristicsmentioning

confidence: 99%

Investigation of Possible Methods for Testing Gas Filters

Gilder¹

1964

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Adsorption Equilibria Hydrocarbon Gas Mixtures.

Cited by 125 publications

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Adsorption of gaseous hydrocarbons on activated carbon: Characteristic kinetic curve

Adsorption of gaseous hydrocarbons on activated carbon: Characteristic kinetic curve

A Critical Short Review of Equilibrium and Kinetic Adsorption Models for VOCs Breakthrough Curves Modelling

Investigation of Possible Methods for Testing Gas Filters

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