The method of drying heat-sensitive products

 

(57) Abstract:

The invention relates to vacuum freeze-drying heat-sensitive products and can be used in pharmaceutical, microbiological, food industry, and also at the enterprises of agro-industrial complex. The invention consists in that in the method of drying heat-sensitive products, including the freezing of the product, removal of water vapor and non-condensable gases from the vacuum chamber, removing non-condensable gases from the zone sublimation is carried out by adsorption getters and their subsequent regeneration. The proposed method of drying heat-sensitive products can increase the depth of the vacuum in the area of sublimation and throughout the volume of the drying chamber, to intensify the process of transfer of the gas mixture from the product, to increase the flow velocity of the drying process. 2 Il.

The present invention relates to vacuum freeze-drying heat-sensitive products and can be used in pharmaceutical, microbiological, food industry, and also at the enterprises of agro-industrial complex.

There is a method of obezvozhivanija vacuum priborov is, he is not used to reduce the partial pressure during the drying of thermolabile products.

The known method of contact dehydration capillary-porous materials [and. C. N 1170245, CL F 26 5/16, 1985] using sorbent stacked layers, alternating with layers of moist material.

The disadvantage of this method is the low driving force of the process in consequence of a small pressure difference in the area of sublimation.

The closest in technical essence and the achieved effect to the present invention is a method of freeze dehydration products [and.with. N 1193400, CL F 26 In 5/06, 1985], including the freezing of products, the removal of water vapor and non-condensable gases from the vacuum chamber through the interaction of the product and of the sorbent.

The disadvantage of this method is that the resulting surface sublimirovannogo body layer vapor-air mixture has a major resistance convective heat and mass transfer, thereby reducing the efficiency of the drying process.

An object of the invention is to intensify the drying process.

This object is achieved in that in the method of drying heat-sensitive product is new is the fact that the removal of non-condensable gases from the zone sublimation is carried out by adsorption getters and their subsequent regeneration.

The technical result consists in the fact that the proposed method of drying heat-sensitive products can increase the depth of the vacuum in the area of sublimation and throughout the volume of the drying chamber; to intensify the process of transfer of non-condensable gases from the product and to increase the flow velocity of the drying process.

The method of drying heat-sensitive products is that frozen heat-sensitive product is placed in a vacuum chamber where the surface sublimirovannogo body forms a layer of air-steam mixture, which provides the main resistance to convective heat and mass transfer. At the entrance of the product into the zone of action of the getter layer is destroyed non-condensable gases above it, which are removed after the drying cycle, together with a getter for subsequent regeneration.

In Fig. 1, 2 shows the circuit implementation of the method of drying the frozen foam and integral frozen product, respectively.

The method of drying heat-sensitive products is as follows.

the layer of steam-air mixture, thermodynamic properties differ from the properties of the environment (this layer cannot be identified with the boundary layer at normal pressure), through which, owing to its great length and low density, transferred significant amounts of steam. It is in this layer there is a change of velocity, temperature and pressure values on the surface of sublimation to the values in the environment and is the main resistance to convective heat and mass transfer. When interacting getter 1 with the product destroys the layer of non-condensable gases above it, which are then absorbed and removed after the drying cycle, together with a getter for subsequent regeneration, thereby reducing the presence of non-condensable gases in the zone of sublimation.

The proposed method for drying heat-sensitive products allows

- to increase the depth of the vacuum in the area of sublimation and throughout the volume of the drying chamber and thereby increase the difference of partial pressures;

- to intensify the process of transfer of gas-vapor mixture from the product.

The method of drying heat-sensitive products, including the freezing of the product, removal of water vapor and non-condensable gases from the BEM adsorption getters and their subsequent regeneration.

 

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