Microwave drying is based on a unique volumetric heating mode facilitated by electromagnetic radiation at 915 or 2,450 MHz. The unique properties and superiority of microwaves over conventional sources of energy have generated immense interest in its use for industrial processing. Microwave technology has been widely embraced in the chemical industry for various applications such as organic syntheses of chemical compounds, material synthesis, sample analysis,drying of pharmaceutical powders and granules, material modification as well as dosage form design.The responses of a lossy powder product to dielectric heating result in rapid energy coupling into the moisture and lead to fast heating and drying.
ChemicalPowder Drying is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid product. This process is often used as a final production step before selling or packaging products. Most of chemicalpowders are temperature sensitive, hence it required to dry at lower temperature to avoid degradation. Our microwave drying systemhelps to overcome this problem by reducing the moisture content at lower temperature (80-90°C)without harming any product quality.A significant reduction in drying time in microwave drying is often accompanied by an improvement in product quality, making it a promising drying technology.
Microwave technology work well as a partner process for drying powder slurry having maximum moisture content. That is, it can be a highly effective supplement to a conventional process. A hybrid system utilizing a traditional convection oven and microwave can capitalize on the efficiencies of both technologies.
Three hybrid combinations that are the most common include:Preheating:
Microwave energy is applied first thing to bring all moisture content to the surface of the material. The material is then sent to a conventional gas- or oil-heated air dryer or oven, which flashes the moisture off by performing three functions, namely:
Continuous/Batch Microwave assisted hot air-drying system is used to dry the material from maximum moisture content to minimum level in single drying operation. Here, hot air heating used to reduce the surface moisture content, while microwave removes moisture from the core &bottom layers to bring it to the surface and remove it.Booster Drying:
Microwave energy is added when all surface moisture has been removed and the drying rate of conventional systems begin to taper off—about two-thirds of the way through the process. The microwave is used to bring remaining moisture to the surface and remove it.Finish Drying:
Microwave energy is applied at the last stage of the drying process, as the material leaves the conventional oven. In finish drying, the microwave takes over just as the conventional system’s efficiency plummets and its own efficiency is greatest. Finish drying is the most popular of the hybrid styles. A primary benefit it can offer is sanitization of the material: if the appropriate temperatures are used, the product in its final stage will be sterilized as well as dry.