Phase equlibiria and diffusivity of dense gases in various polyethylenes

Čuček, D.; Perko, Tina; Ilić, Ljiljana; Znoj, Bogdan; Venturini, P.; Knez, Željko; Škerget, Mojca

doi:10.1016/j.supflu.2013.03.020

Cited by 15 publications

(2 citation statements)

References 29 publications

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“…With increasing pressure, and consequently increasing concentration of gas, the diffusion coefficient reaches a maximum and then decreases, probably because of the filled spaces between chains and the hydrostatic pressure hindering the chain mobility and reducing the free volume [19,33]. A similar behaviour of diffusion coefficients has been reported in literature before [8,19,20,34]. The decrease of diffusion coefficients could also be explained with the dependence on solvent density -with increasing solvent density the diffusion coefficient of argon may decrease because of the increasing numbers of collisions.…”

Section: Solubility and Diffusion Coefficient Of Argon In Polyethylensupporting

confidence: 79%

Solubility and binary diffusion coefficient of argon in polyethylene glycols of different molecular weights

Trupej

Chen

Škerget

et al. 2015

The Journal of Supercritical Fluids

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Section: Solubility and Diffusion Coefficient Of Argon In Polyethylensupporting

confidence: 79%

Solubility and binary diffusion coefficient of argon in polyethylene glycols of different molecular weights

Trupej

Chen

Škerget

et al. 2015

The Journal of Supercritical Fluids

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“…To investigate polymer swelling various experimental methods have been employed and reported in the literature . Most of them use a pressure cell with windows that enable the direct observation of polymer sample changes.…”

Section: Introductionmentioning

confidence: 99%

Swelling of polyethylene particles and its relation to sorption equilibria under gas‐phase polymerization conditions

Podivinská

Jindrová

Chmelař

et al. 2017

J of Applied Polymer Sci

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The attempts to predict the swelling of semicrystalline polyolefins using equations of state have not been successful so far and the few conducted experimental investigations have been limited to a narrow range of samples and conditions. This article presents a systematic video‐microscopic study of the swelling induced in various grades of PE particles by the sorption of ethylene and co‐monomers (propylene, 1‐hexene) at condition relevant to gas‐phase polymerization. Based on experimental data for various PE densities, the swelling factor H was evaluated, which enables the prediction of PE swelling by ethylene. The swelling data were compared with the corresponding gravimetrically measured sorption isotherms. In the case of ethylene and propylene sorption, the swelling significantly influences the evaluation of sorption isotherms. Conversely, the effect of swelling was negligible for higher hydrocarbons. The observed impact of swelling on the sorption is discussed based on the evaluated partial molar volumes of penetrants. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45035.

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Experimental determination of gas diffusivity in liquids—A review

Upreti

Mehrotra

2021

Can J Chem Eng

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Unit operations and processes abound with gas diffusion in liquids, which is a sophisticated phenomenon in which mass transfer is characterized by diffusion coefficient or diffusivity. Compared to diffusion in gas phase, the closely packed liquid molecules strongly influence diffusive mass transfer to the extent that it is impossible to have a general theory for a reasonably accurate estimation of diffusivity in liquids. This situation is further compounded by the fact that diffusivity cannot be measured directly but can only be estimated indirectly with the help of a number of observable properties (eg, mass, volume, pressure, etc). This fact gives rise to a myriad of experimental methods for the determination of gas diffusivity in liquids. These methods report gas diffusivities over widely varying ranges of temperature, pressure, and liquid composition. To provide a state‐of‐the‐art knowledge base for such methods is the objective of this work. The focus is on gas diffusion in binary gas‐liquid systems. Starting with necessary theoretical foundations, we provide a systematic categorization of these methods based on the property change utilized for diffusivity determination. The methods are then concisely described, and the diffusivity data are summarized for over 160 gas‐liquid systems at different temperature and pressure conditions. Empirical correlations are provided for different gas‐liquid systems, which could be used for interpolating gas diffusivity as a function of temperature, pressure, and composition.

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Phase equlibiria and diffusivity of dense gases in various polyethylenes

Cited by 15 publications

References 29 publications

Solubility and binary diffusion coefficient of argon in polyethylene glycols of different molecular weights

Solubility and binary diffusion coefficient of argon in polyethylene glycols of different molecular weights

Swelling of polyethylene particles and its relation to sorption equilibria under gas‐phase polymerization conditions

Experimental determination of gas diffusivity in liquids—A review

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