Recuperación de nanopartículas de alofán del refrigerante secundario propilenglicol mediante varios métodos de separación de mezclas.

Abstract

The objective of this research work is to recover allophane nanoparticles of secondary refrigerant with propylene glycol base, in order to make known the methods that can be applied. The execution of the work began with the experimentation of the uniform dispersion of nanoparticles in the base fluid and then proceeded with separation methods of mixtures such as: centrifugation and vacuum distillation. The results obtained show that by means of the addition of surfactant SDS (sodium dodecyl sulphate), the nanoparticles remained stable at 46 percent after 24 hours of processing, although it was possible to improve its stability, it is not advisable to work because it generates foam when agitated and acts as a thermal insulator. The recovery by centrifugation has a high efficiency reaching 92 percent of recovered nanoparticles, while the vacuum distillation method has a 100 percent efficiency allowing recovering their compounds separately (water and propylene glycol) while the NPs are completely isolated, the only difficulty is its total collection. It is recommended the implementation of a refrigeration system for the rotavapor in addition to installing a mixing system in the chiller reservoir to disperse the nanoparticles, in terms of recovery using the centrifugation method is recommended for small volumes.