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Cristallisation des solutions aqueuses de clathrates en présence d'additifs et d'agents tensio-actifs.

The crystallization of clathrate aqueous solutions in the presence of additives and surfactants.

Auteurs : HADJIEVA M., STOYANOVA V., VASSILEV T., et al.

Résumé

The crystallization of the tetrabutylammonium bromide (TBAB) clathrate solutions was investigated with the aim of finding optimal ways of initiation and control of the crystallization process and obtaining structural stability of the slurry during repeatable thermal cycling in technology applicable temperature range. The authors succeeded in composing and investigating of TBAB aqueous solutions in various concentrations (from 5 to 40 wt%, while the optimal concentration is at 10 wt%). Minor quantities of surfactants containing Br- or Cl-anions were responsible for better structuring and stability of the TBAB emulsions formed. The additives of NH4Br, NH4Cl, NH4F and/or the respective alkaline salts NaCl and KBr, guaranteed the necessary temperature range of crystallization and pH-values of the TBAB slurry solutions for improving adsorption of the surfactants and optimal crystallization. The additives were active in initiating controlled crystallization in the phase transition temperature range between 2 and 17°C of either the TBAB or of its fluorine or chlorine modifications.

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Détails

  • Titre original : The crystallization of clathrate aqueous solutions in the presence of additives and surfactants.
  • Identifiant de la fiche : 2006-2966
  • Langues : Anglais
  • Source : Proceedings of the sixth Workshop on Ice Slurries of the IIR/Proceedings of the Second Conference on Phase Change Material and Slurry (PCM 2005).
  • Date d'édition : 15/06/2005

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