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Mini fast vacuum freeze-drier and its drying method

A vacuum freeze-drying and fast technology, which is applied in the direction of drying solid materials, drying solid materials without heating, drying, etc., which can solve the problems of high one-time investment, operation and maintenance costs of equipment, restrictions on promotion and application, and high energy consumption of operations and other problems, to achieve the effect of compact structure, low temperature of cold source, and large water vapor pressure difference

Inactive Publication Date: 2005-05-18
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] A common freeze dryer is mainly composed of a refrigeration system, a vacuum system, a heating system, an operating system, etc., including a refrigerator and some automatic devices for control, and the structure is relatively complicated; this type of freeze dryer uses a refrigerator to cool , achieved through the phase change of the circulating medium, the energy consumption of the operation is relatively large; at the same time, the price is generally expensive, and the one-time investment of the equipment as well as the operation and maintenance costs are very high; its widespread promotion and application are greatly restricted

Method used

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  • Mini fast vacuum freeze-drier and its drying method
  • Mini fast vacuum freeze-drier and its drying method

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Embodiment Construction

[0016] 1. Pre-freeze the sample to obtain a sample whose temperature is lower than the eutectic point of the sample solution. This device uses the pre-freezing method outside the box: the sample is quickly pre-frozen with the refrigerant (dry ice acetone solution or liquid nitrogen) in the freeze-drying chamber (no other cooling medium or cooling equipment is required). The operation method is to immerse the lower end of the sample drying chamber containing the material to be pre-frozen in the refrigerant in the freezing chamber and let it stand for a few minutes, and the pre-frozen sample will be obtained after the freezing is completely taken out. A better method is to rotate the sample bottle at a constant speed after the sample bottle is immersed in the refrigerant, so that the sample is evenly frozen on the inner wall of the sample bottle to form a shell shape, so as to achieve a larger surface area, reduce the frozen thickness of the sample, and speed up the subsequent sa...

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Abstract

The invention discloses a miniature rapid vacuum freeze dryer and a freeze drying method. It belongs to vacuum freeze drying equipment and process technology. The vacuum desiccator is mainly composed of a freeze-drying chamber, a refrigerant contained in the freeze-drying chamber, a vacuum device connected with the freeze-drying chamber, a condensation receiving chamber and a sample drying chamber. The method for freeze-drying samples by using the above-mentioned vacuum freeze-dryer is to place the sample drying chamber containing the sample in the refrigerant in the freeze-drying chamber to pre-freeze the sample, and then quickly place the pre-frozen sample drying chamber and the freeze-drying chamber Connected with each other, using an air bath at room temperature or an external heating source as the heating medium, and freeze-drying under vacuum conditions. The main advantages of the present invention are that the structure of the freeze dryer is simple, portable and flexible, the production cost is very low, the operation process is simple, the equipment runs smoothly, the energy consumption is low, the pre-freezing speed is fast, and the freeze-drying time is short.

Description

technical field [0001] The invention relates to a miniature rapid vacuum freeze dryer and a freeze drying method. It belongs to vacuum freeze drying equipment and process technology. Background technique [0002] Freeze-drying technology and related equipment are widely used in biological products, medicine, food and other industries as well as many scientific research departments. Freeze-drying refers to the process of removing moisture from frozen products by sublimation. The use of cold drying method to dry substances has the advantages of maintaining the structure of substances, maintaining the activity of heat-sensitive substances (such as proteins, microorganisms, etc.), and reducing the loss of volatile substances. [0003] A common freeze dryer is mainly composed of a refrigeration system, a vacuum system, a heating system, an operating system, etc., including a refrigerator and some automatic devices for control, and the structure is relatively complicated; this t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B5/06
Inventor 吴学森卢剑
Owner TIANJIN UNIV
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