Organic solvent spray dryer and vacuum freeze dryer
Spray dryer is a kind of equipment that dries solutions, suspensions or pastes into powders or granules, which are widely used in pharmaceutical, food, chemical and other fields. Organic solvent spray dryer is a special spray dryer that uses organic solvent as a carrier to remove the moisture or solvent in the material by spray drying.
Vacuum freeze dryer is a kind of equipment that sublimates or vaporizes the moisture or other solvents in the material at low temperatures, so as to achieve drying. It is widely used in food, medicine, biological products and other fields, because it can maintain the original structure and nutritional composition of materials at low temperatures.
There are some differences in principle and application between organic solvent spray dryers and vacuum freeze dryers. The principles, features, and applications of these two devices are described below.
1. Organic solvent spray dryer.
Principle: The organic solvent spray dryer is to mix the material with the organic solvent, and then spray the mixture into the high-temperature drying chamber through the sprayer for drying. In the drying chamber, the solvent evaporates rapidly and the material is dried into powder or granular form.
Features:1Wide range of application: Organic solvent spray dryer is suitable for drying various solutions, suspensions or pastes, especially for materials that are sensitive to heat or easy to oxidize.
2.Fast drying speed: Due to the spray drying method, the contact area between the material and the hot air is large, the drying speed is fast, and it is not easy to deteriorate by heat.
3.Strong controllability: By adjusting parameters such as temperature, pressure and flow, the degree of dryness of the material and the nature of the product can be controlled.
4.Poor environmental protection: due to the use of organic solvents, it is easy to produce problems such as environmental pollution and solvent residues.
Application: Organic solvent spray dryer is widely used in pharmaceutical, food, chemical and other fields, such as the preparation of microcapsules, drug carriers, catalysts, pigments, etc.
2. Vacuum freeze dryer.
Principle: The vacuum freeze dryer is to place the material in a low-temperature vacuum environment, and use the difference between the freezing point and the boiling point of the material at low temperature to remove water or other solvents through sublimation or vaporization to achieve drying.
Features:1Keep the original shape: The vacuum freeze dryer is dried at low temperature, which can maintain the original structure and nutrients of the material, and is suitable for food, medicine, biological products and other fields.
2.Energy saving and environmental protection: due to the use of low temperature sublimation method, the energy consumption is low, and there is no waste water, waste gas and other pollutant emissions, and the environmental protection performance is good.
3.Long drying time: Vacuum freeze dryers require a long drying time because they need to be gradually heated up and a certain vacuum level maintained.
4.Higher cost: Higher equipment costs and maintenance costs due to the need to use high-cost equipment such as cryogenic equipment and vacuum pumps.
Application: Vacuum freeze dryer is widely used in food, medicine, biological products and other fields, such as the preparation of freeze-dried food, vaccines, plasma, etc.