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Gas hydrate promoters for CO2 hydrate formation: thermodynamic and kinetic studies with cyclic ethers and surfactant

Haillot, Didier and Torré, Jean-Philippe and Rigal, Sacha and Bedecarrats, Jean-Pierre Gas hydrate promoters for CO2 hydrate formation: thermodynamic and kinetic studies with cyclic ethers and surfactant. (2016) In: 47th French Conference on Calorimetry and Thermal Analysis, 17 May 2016 - 20 May 2016 (Anglet, France). (Unpublished)

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Abstract

Gas hydrates are solid crystalline compounds consisting of a lattice structure formed by a network of water molecules which can encage small guest molecules such as CO2 1. These compounds are of interest in many practical applications (flow assurance, separation processes, storage of gases, etc…) where thermodynamic and kinetic properties are of importance. For some applications, it is necessary to accelerate hydrate formation, and for this purpose, the addition of additives is of common use. Among the various chemical compounds able to act as thermodynamical hydrate promoters, Tetrahydrofuran (THF), a cyclic ether with the formula C4H8O, is very popular 2. However, this compound is harmful and may cause technical damages in the process installations. This study propose to investigate how another cyclic ether, the 1,3 dioxolane (DIOX) could be used as a substitution product than THF, as DIOX is less harmful and more easy to use than THF 3. In this respect, this studies proposes: (i) to study using high pressure calorimetry the thermodynamical effect of these two additives on hydrate phase equilibria with CO2 gas; (ii) to study using a batch reactor the hydrate formation kinetics obtained by using THF or DIOX with/or without surfactant (SDS). On a thermodynamical point of view, our results demonstrate clearly that THF is a better thermodynamic promoter than DIOX. On a kinetic point of view, it was shown that the combination of the thermodynamic promoter (THF or DIOX) with the surfactant (SDS) was a very interesting solution to accelerate hydrate formation. Finally, it can be concluded that the combination THF+SDS, both thermodynamically and kinetically, remains the more efficient solution to enhance hydrate formation in the scope of this work.

Item Type:Conference or Workshop Item (Other)
Additional Information:Full text not available from this repository
Audience (conference):National conference without published proceedings
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Total (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
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Deposited On:21 Feb 2019 14:25

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