Under normal circumstances, we must have a general understanding when purchasing a dryer. Below we will give you a brief introduction to the knowledge issues that spray dryers need to understand before choosing them. It is not necessarily comprehensive and is for reference only. Laboratory spray dryers usually have certain requirements, so these requirements must be met before the most suitable one can be selected.
First, whether it is a material with high sugar content or heat sensitivity
Most of the polysaccharide disaccharides have a relatively low melting point. When heated, the sugars melt, and the polysaccharide disaccharides themselves are easier to absorb moisture. Therefore, ordinary spray dryers are prone to sticking to the wall and are not easy to obtain. Good dry powder or granules. In addition, like enzyme preparations, live bacteria, and some polymer materials that are easily denatured at high temperatures, the materials are easily deactivated or denatured using ordinary spray dryers. At this time, reduce the air inlet temperature and air outlet of the spray dryer. Temperature, you can get a better experimental effect.
Second, whether the solvent is an organic solvent or an easily oxidizable material
In spray drying, materials containing organic solvents are difficult to dry. Generally, organic solvents are flammable and explosive. The explosion-proof closed laboratory spray dryer enables the materials to circulate in the closed drying system, and the entire system is full Inert gas can avoid the contact of organic solvent gas with outside oxygen, ensuring safe production. Moreover, because of the low boiling point of organic solvents, low-temperature drying methods can be used to dry materials that are prone to thermal denaturation.
Third, is it necessary to obtain large-particle powder materials?
In some experiments, researchers hope to get some samples of large particles. For example, in the catalyst industry, particles of about 100 microns are generally required to have a better catalytic effect, but ordinary spray dryers can only obtain particles below 30 microns.
Fourth, is it a material with extremely poor heat sensitivity or needs to improve solubility?
Some materials can hardly be heated. The traditional freeze-drying time is very long, and the dried material becomes lumpy, the fluidity is poor, and the solubility is not very good. Laboratory spray freeze dryer is suitable for low-temperature drying of heat-sensitive, viscous, active materials and materials with high sugar content, such as natural Chinese herbal medicine extracts, dairy products, biological preparations, enzyme preparations, fruit juices, and polymer materials Wait.
Fifth, whether it is a conventional material
If the laboratory is performing the preparation of conventional powders or drying of materials, for some special materials containing chloride ions, suitable models carefully made of special stainless steel resistant to chloride ions can meet the actual needs of special industries.