How do small spray dryers dry materials with higher sugar content or heat sensitivity?

How do small spray dryers dry materials with higher sugar content or heat sensitivity?

The following senior engineers will answer your questions: the spray drying of small spray dryers contains the problem of drying of machine solvent materials. Generally, organic solvents will be inflammable and explosive. The explosion-proof closed laboratory spray dryer can make the materials in a closed state. The system is circulated in the drying system, and the whole system is filled with an inert gas (such as nitrogen or argon) to avoid contact between the organic solvent gas and the outside oxygen, ensuring safe production. The spray dryer adopts a safe nitrogen (or other inert gas) closed circulation mode. The whole system is closed, and the oxygen concentration is monitored online. Once the oxygen concentration in the system reaches 2%, the system will automatically stop and alarm. It is a small-sized spray dryer for laboratory organic solvents with good safety and easy operation. It can treat flammable and toxic solvents through the combination of nitrogen closed circulation and complete solvent recovery, and can be easily oxidized. dry. Further, since the boiling point of the organic solvent is low, it is possible to dry the substance which is susceptible to heat denaturation by a low-temperature drying method.

Spray dryers spray dry higher sugar (if juice, herbal or natural product extracts) or heat sensitive materials (such as Enzyme preparations, etc.).

Because most of the polysaccharide disaccharides have a relatively low melting point, the sugar melts when heated, and the polysaccharide disaccharide itself is relatively easy to absorb moisture, so ordinary spray dryers are prone to sticking, which is not easy. Get good dry powder or granules. In addition, like enzyme preparations, live bacteria and some high-molecular materials that are easily denatured at high temperatures, ordinary spray dryers are used, and the materials are easily deactivated or denatured. At this time, the inlet air temperature and air output of the spray dryer are lowered. Temperature, you can get better experimental results.

The advantages of spray dryers are mainly concentrated in the following points :

(1) The spray dryer dries very quickly. After the spray is sprayed, the surface area is large. In a high temperature air stream, it can evaporate in an instant.

(2) The temperature of the droplets during the drying process of the spray dryer is not high, and the product quality is good. Spray drying uses a wide temperature range (80-800 degrees). Even with high temperature hot air, the exhaust air temperature is not very high. In the early stage of drying, the material temperature does not exceed the wet bulb humidity of the surrounding hot air. it is good. For example, defects such as protein changes, vitamin loss, and oxidation are less likely to occur. The quality of heat sensitive materials, organisms and drugs is basically close to the standard for drying under vacuum.

(3) Spray dryer products have good dispersibility, fluidity and solubility. Since the drying process is completed in air, the product can basically maintain a spherical shape similar to the droplets, with good dispersibility, fluidity and Solubility.

(4) Dissolution of spray dryer production process, convenient operation control Spray drying is usually used to treat solutions with moisture content of 40%-60%. Even if the moisture content of special materials is up to 90%, it can be dried without powder. Product. Most products do not need to be pulverized and screened after drying, which reduces the production process and simplifies the production process. The particle size, bulk density and moisture of the product can be adjusted within a certain range by changing the operating conditions, and the control and management are very convenient.

(5) Preventing pollution and improving the production environment Since spray drying is carried out in a closed drying tower, this avoids the drying of dry products in the workshop. For toxic and odorous materials, the production process of closed circulation system can be used to burn toxic gas and odor, prevent air pollution and improve the production environment.

(6) Spray dryer is suitable for continuous large-scale production. Spray drying can meet the requirements of large-scale industrial production. The dry product can be continuously discharged, and combined with cooler and wind transmission in the post-treatment to form a continuous production line.