Freeze Drying Knowledge

Freeze drying works by freezing the material, and then reduce its surrounding pressure, to allow the water sublimate directly from solid phase to gas. Product is dried keep all its original characters, and freeze drying can apply to almost all industries. 

Definition of Freeze Drying

Freeze drying or lyophilization, is a low temperature dehydration process. Dry products in a solid state and is under vacuum environment. Typically use to preserve perishable materials or make the material more convenient for storage.

How It Works?

Vacuum freeze drying is a sublimation process. It removes water by freezing the material, and then reduce its surrounding pressure to allow the frozen water in the material to sublime directly from solid phase to gas.

Freeze Drying and Lyophilization

Lyophilization and freeze drying are synonymous. People call freeze drying in food industry, and call it lyophilization in bio and pharma industry. Depends on customary or the industry it taking place.

Advantages of Freeze Drying

Freeze drying is a low temperature dehydration method. During the process, most time, materials keep in minus temperature. So, freeze drying has less impact on product chemical properties, no ruin the biological activity, vitamin, flavor, taste and appearance.

Freeze Drying 3 Stages

Freezing Stage. Materials completely frozen is the first step also is the insurance of a success lyophilization.

Primary Drying Stage. Remove physical water, as know, >90% water in raws are physical water, this stage takes quite long time.

Secondary Drying Stage. Remove bound water, bound water is hard to remove, this stage need ultra vacuum and higher Temp.

Freeze Drying Cost

Freeze drying technology costly. The freeze drying equipment matters only 10% of its overall cost, 90% is its operation. A poor machine designing and a lack of productivity due to machine maintenance is going to cost you continuously.

Freeze Dryer Categories

Based on production capacity, they can be divided into lab scale and production scale.

Based on application fields, they can be divided into pharmaceutical lyophilizers, food freeze dryers and general purpose freeze dryers.

Freeze Drying Solutions

Purchase of a freeze dryer need consider: Application Feasibility, Supporting Facilities, Freeze Drying Batch Duration, Consumptions Of Water and Electric, Total Investment and Future Necessary Maintain/Labor Cost etc. Which need a comprehensive investigate, to guarantee your freeze drying business is profitable.

Freeze Drying Applications

Products Can be Freeze Dried

  • Food, Fruits, Vegetables, Meats, Dairy, Eggs, Meals, Coffee
  • Pharmaceutical, Vaccines, Injectable Formulations, Serum, Penicillin
  • Biological, Lactic acid bacteria, Probiotics, Plant Extracts.
  • Chemical, Graphene, Earth

Products Can not be Freeze Dried

  • High fat, sugar and oil contain products not suit freeze drying. Like syrup, pure chocolate, pure honey and butter etc. is not easy to dry.

Differences Between Freeze Drying and Vacuum Drying

The main difference between them is the water remove theory: Vacuum drying based on water boiling point, and vacuum freeze drying based on water melting point.