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СATALOGUE / DRYING OF BULK MATERIALS IN A FLUIDIZED BED / Atmospheric freeze dryer in a fluidized bed

Atmospheric freeze dryer in a fluidized bed

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СATALOGUE / DRYING OF BULK MATERIALS IN A FLUIDIZED BED / Atmospheric freeze dryer in a fluidized bed

Atmospheric freeze dryer in a fluidized bed

Atmospheric freeze drying of frozen spherical particles can also be carried out in a fluidized bed apparatus. This technology allows to obtain new products consisting of smooth spherical particles with a unique porous structure that promotes their rapid dissolution, which is very important for new generation pharmaceutical products. A modified laboratory unit Mini-Glatt, developed at the Institute of Pharmaceutical Technology of the University of Basel (Switzerland) in cooperation with Glatt (Germany), for freeze drying of material in active hydrodynamic mode is presented. Similar equipment is presented in the International Training and Research Center for Transfer of Pharmaceutical and Biotechnologies at D.I. Mendeleev USAn Chemical Technology University (USA). The laboratory unit is a batch apparatus consisting of cylindrical and conical parts.

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  • Information updated : 10 / 10 / 2024
  • In stock
  • Manufacturer : 1 year for Atmospheric freeze dryer in a fluidized bed

Model: Atmospheric freeze dryer in a fluidized bed

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Subsequent atmospheric freeze drying was carried out in a boiling layer of adsorbent particles with a size of 80 microns. The rehydration properties of the products were not inferior to those obtained by vacuum freeze drying. Obtaining pharmaceutical protein-containing powders by freeze drying at atmospheric pressure in fluidized bed apparatuses opens wide prospects and advantages of their application. The dry product has high dispersibility, porosity, fast and complete solubility, good bulkiness and is ready for use. At the same time, dry powder can act as a semi-product and be used to produce tablets, capsules and other solid dosage forms, since its characteristics allow for mixing, pressing, granulation operations. The finished product due to its minimal particle size can be used for injectable, nasal, transdermal administration, has instant solubility and delivery properties of active components. Thus, the methods of atmospheric freeze drying are focused on obtaining products with particle size of micro- and nanosize with predetermined molecular structure and predetermined properties.

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Technical specifications

To cool the air to the required temperature, there is an additional cartridge located just before the conical part, which is filled with dry ice. The cylindrical part of the apparatus ends with a filter designed to catch and prevent fine particles from being carried away by the air stream. The filter is shaken periodically. Air, previously passed through the cartridge with dry ice, is supplied through the inlet opening of the conical part of the apparatus at a speed that provides a stable hydrodynamic regime. At the chamber outlet, the air is sequentially supplied for purification, heating and drying.

Additional information

Atmospheric freeze drying under conditions of convective heat supply allows: to intensify the process of moisture removal ten times; to significantly reduce the time of its implementation, while obtaining products that are not only not inferior in preserving useful properties to those freeze-dried in vacuum, but also superior to them in some qualitative characteristics; to organize the process not only in periodic, but also in semi-continuous and continuous modes. Scientists have demonstrated the suitability of atmospheric freeze drying for the treatment of coarse materials. However, due to the significant particle size (more than 1 cm) the process duration was an order of magnitude higher in comparison with vacuum freeze drying. To reduce the process time, part of the moisture was preliminarily removed by osmotic dehydration.

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