Vacuum drying is a mass transfer technique that removes water from a substance (usually a wet solid) by applying a vacuum. Drying is an important unit activity for removing water in chemical processing industries such as food processing, pharmaceutical, agriculture and textiles. Vacuum drying is a technology for drying hygroscopic or heat-sensitive substances by reducing the pressure inside the chamber to below the vapor pressure of water by creating a vacuum and forcibly boiling it. Reduce the pressure around the material to be dried with a vacuum pump.
This lowers the boiling point of the water in the product and greatly increases the evaporation rate Tridentent Singapore. As a result, the drying speed of the product is greatly improved. [2] The pressure for vacuum drying is typically 0.03-0.06 atm, whereas the boiling point of water is 25-30 °C. The way vacuum ovens are priced is a batch operation that allows for faster drying by using sub-atmospheric pressures and relative humidity.
Vacuum Dryer is a device that enables vacuum drying. Vacuum dryers are also known as vacuum ovens in the pharmaceutical industry. Some vacuum dryers are made of cast iron, but most of them are currently made of stainless steel that can withstand high vacuum without deformation. The furnace is divided into hollow sheets to increase the heat transfer surface. The oven door is airtight and connected to a vacuum pump to minimize pressure. The material to be dried is held on the tray inside the
vacuum dryer, and the pressure is reduced by the vacuum pump. The dryer door is tightly closed and steam passes through the space between the tray and shell so that heat transfer is by conduction. Water vapor from the feed is sent to the condenser, after drying the vacuum pump is turned off and the dried product is collected from the tray. The
Vacuum Dryer can be used to dry heat-sensitive, hygroscopic and toxic materials. When the dry raw material is a solution, it can be dried using a vacuum dryer because the solvent can be recovered by concentration. Hybrid drying, which combines osmotic dehydration followed by heat pump drying and microwave vacuum drying, has been proven to improve product quality, such as fruit preservation [1].
Vacuum drying is a mass transfer process in which the water present in a substance (usually a wet solid) is removed by applying a vacuum. Drying is an essential basic operation to remove water in chemical processing industries such as food processing, pharmaceuticals, agriculture, and textiles. [1] Vacuum drying, which is generally used for drying hygroscopic and heat-sensitive substances, is based on the principle of boiling by generating a vacuum to lower the pressure in the chamber below the vapor pressure of water. Reduce the pressure around the material to be dried with the help of a vacuum pump. This lowers the boiling point of water in the product, thereby Read More
