Shanghai Bilang teaches you how to choose a small spray drying machine in the laboratory.
Spray drying is a drying method for rapidly drying liquid materials. After the liquid material is atomized in the drying chamber, the moisture is instantaneously vaporized in contact with hot air to obtain a dried product, which can directly make the solution and the milk. The turbid liquid is dried into a powdery or granular product, and the processes of evaporation, concentration, pulverization, etc. can be omitted, and the obtained particles are uniformly distributed.
Spray drying has the characteristics of fast heat transfer, rapid evaporation of water, instant drying time, good product quality and good solubility, which can improve the dissolution rate of some preparations. In addition, spray drying can also be used to prepare microcapsules.
“Workers must first sharpen their tools if they want to do their job wellâ€. Researchers may need different types of laboratory sprays for the physical or chemical properties of different materials, as well as the size and solubility of the powder or particles that the experiment requires. The dryer can get the best experimental results.
If it is high in sugar (if juice, Chinese herbal medicine or natural product extract) or heat sensitive material (such as enzyme preparation live bacteria, etc.), because most polysaccharide disaccharides have a lower melting point, when heated, sugar occurs. Melting, and the polysaccharide disaccharide itself is relatively easy to absorb moisture, so the ordinary spray dryer will easily appear sticky wall phenomenon, it is not easy to get good dry powder or particles. 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, laboratory spray dryer and laboratory low temperature spray dryer can test at a lower inlet air temperature, for example, this is the choice of dryer with inlet air temperature can be set to 110 ° C Generally, the high sugar content of the material can get better particles. Some materials may have a lower melting point. At this time, you can choose a combination of spray drying and vacuum drying. The spray drying process can be completed at 60~80 °C, such as enzyme preparation, live bacteria, etc. It is instantly dried at low temperatures and the activity is completely unaffected.
Furthermore, the solvent is an organic solvent or an easily oxidizable material, and the problem of drying the organic solvent in the spray drying is difficult. Generally, the organic solvent is inflammable and explosive, and the explosion-proof closed laboratory spray dryer enables the material to be Circulating in a closed drying system, the entire 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.
In some experiments, researchers hope to get some samples of large particles, such as the catalyst industry, generally need about 100 microns of particles to have better catalytic effect. At this time, spray drying with small particle powder granulation function can be selected. This machine can be used as a separate spray dryer to obtain particles of about 100 microns, and to achieve granulation of small particles, which can obtain large particles of 100 microns or more.
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