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Communication Dans Un Congrès Année : 2014

Monitoring and Modeling the crystallization of the CP Gas hydrate via FBRM probe

Résumé

Cyclopentane (CP) is an organic thermodynamic additive which promotes the clathrate hydrate formation at low pressure and middle temperature. It forms classical gas hydrates with structure SII. Cyclopentane is dispersed as an emulsion, and crystallizes with CO2 to form a clathrate hydrate a low pressure that is enriched in the CO2 (Galfré et al, 2014). Experimental studies were investigated with a focused Beam Reflectance Measurements (FBRM) probe in a cooled stirred batch reactor. Firstly, we performed a parametric study to allow evidencing the occurrence of the coalescence of the CP droplets in the emulsion at high speed rate and at low ratio of surfactant (Tween 80). As the surfactant concentration is increased, we monitor the coalescence phenomenon of the droplets and observe it is reduced. Secondly, in presence of a stable emulsion of CP in water, we observe the crystallization of mixed hydrates of CP and CO2. It was found that the FBRM can successfully monitor the nucleation. A sudden change in the mean chord length is observed followed by an enlargement of the Chord Length Distribution (CLD), and a progressive disappearance of the CP droplets, to the benefice of the mixed hydrate of CP and CO2. We give arguments that time evolution of the mean chord length distribution is not only related to the agglomeration phenomenon of the particles, but also to the individual crystallization of the CP droplets from a shrinking core process.
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Dates et versions

hal-01069632 , version 1 (29-09-2014)

Identifiants

  • HAL Id : hal-01069632 , version 1

Citer

Aurélie Galfré, Ana Cameirão, Jean-Michel Herri. Monitoring and Modeling the crystallization of the CP Gas hydrate via FBRM probe. The 8th International Conference on Gas Hydrates, Jul 2014, Pékin, China. pp.T5-17. ⟨hal-01069632⟩
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