Selection of eutectic point tester for Shuangjia freeze dryer

Shuangjia freeze dryer can be selected as the eutectic point tester for sjia-20fd / 30fd / 50fd / 100fd pilot freeze dryer of Shuangjia series In the process of freeze-drying, the final temperature of Zui is based on its eutectic point, and the temperature of material is based on its eutectic point when it is dried and heated The eutectic point of a material is the temperature at which all the moisture in the material freezes In order to ensure the complete freezing of the material, the pre freezing temperature is 5-10 ℃ lower than the eutectic point of the material If the pre freezing temperature is too low, the energy consumption and production cost will be increased; if the pre freezing temperature is higher than the eutectic point, the moisture in the material will not be completely frozen, and the moisture in the material will not be completely sublimed in the form of ice, resulting in shrinkage and deformation of the material in the drying process In addition, the solute contained in the unfrozen water may migrate to the surface of the material with the internal water during the drying process, resulting in the surface hardening of the freeze-dried products The common melting point of material refers to the temperature of completely frozen material when the temperature rises to a certain value and the ice crystal inside the material begins to melt When drying, the heating temperature should not be higher than the common melting point of the material, otherwise there will be bubbles or inflation expansion inside the material, which will affect the quality of freeze-dried products Therefore, it is very important to determine the eutectic point and melting point of the material accurately for the formulation of freeze-drying process plan and the optimization control of freeze-drying process More pilot scale freeze dryers, 158 6964 1262