Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts

Saheb Maghsoodloo Babakhani (1, 2) , Son Ho-Van (1, 2, 3, 4) , Baptiste Bouillot (1, 2) , Jérôme Douzet (1, 2) , Jean-Michel Herri (1, 2)

1 PEG-ENSMSE - Département Procédés pour l'Environnement et Géoressources
2 LGF-ENSMSE - Laboratoire Georges Friedel
3 ORPD - Oil Refinery and Petrochemistry Department
4 HUMG - Hanoi University of Mining and Geology

Interest of Clathrate hydrates for industrial applications is rising. While numerous studies can be found on carbon capture or desalination, this effort investigates thermodynamics of the combined process using cyclopentane (CP) as second guest molecule. This document provides numerous equilibrium data of mixed CP/CO₂ hydrates in presence of salt (NaCl, KCl) under differents concentrations. Final dissociation points are collected, as well as intermediate dissociation points in presence of hydrates. While the first provide equilibrium data, the others are not at equilibrium. Indeed, Results show that, in presence of salts, several crystallization events occur in the system. Consequently, multiple hydrate structures could be formed in the bulk, such as pure CO₂ hydrates and mixed CO₂/CP hydrates Finally, van der Waals and Platteeuw approach has been used and furnishes results within 0.4K uncertainty compared to this work and within 0.5K compared to literature. Besides, thermodynamic consistency of data has been evaluated.

Mots clés: Clathrate hydrates; crystallization; carbon capture; desalination; Thermodynamics

Domaines: Génie des procédés

Saheb Maghsoodloo Babakhani, Son Ho-Van, Baptiste Bouillot, Jérôme Douzet, Jean-Michel Herri. Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts. Chemical Engineering Science, 2020, 214, pp.115442. ⟨10.1016/j.ces.2019.115442⟩. ⟨hal-02414467⟩