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Vacuum freeze drying method and vacuum freeze dryer

A vacuum freeze-drying and drying technology, applied in the direction of drying solid materials, drying solid materials without heating, drying, etc., can solve the problems of poor freezing efficiency and poor grain quality, and achieve improved quality, uniform cooling and heating, The effect of shortening the process steps

Active Publication Date: 2015-09-30
BEIJING HAIHETIAN TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of poor freezing efficiency and poor grain quality in the existing freeze dryers provided above, a vacuum freeze drying method that improves freeze-drying efficiency and ensures freeze-drying quality on the basis of temperature control is proposed Method and vacuum freeze-drying device for realizing the method

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  • Vacuum freeze drying method and vacuum freeze dryer
  • Vacuum freeze drying method and vacuum freeze dryer
  • Vacuum freeze drying method and vacuum freeze dryer

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Embodiment Construction

[0031] The structure and working principle of the present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments:

[0032] The invention provides a vacuum freeze-drying method for freeze-drying materials, which comprises the following steps:

[0033] a. Pre-freezing step, pre-freeze the material to 1-10°C above the eutectic point temperature of the material, so that the material can pass through the eutectic point in the shortest possible time, so as to effectively control the particle size of the crystallization crystals, thereby obtaining fine frozen Dry powder, improve the quality of freeze-dried powder products.

[0034] b. In the first heat preservation step, make the material 1-10°C above the eutectic temperature of the material, and keep it for 10-20 minutes;

[0035] c. In the quick freezing step, the temperature of the material is reduced to between -30°C and -45°C within 5-10 minutes;

[0036] d. In the seco...

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Abstract

The invention provides a vacuum freeze dryer which comprises a material box, a water catching bin, a refrigerating unit, a heater, a vacuum pump and a control device. The material box is communicated with the water catching bin. The water catching bin is connected with the vacuum pump. The refrigerating unit and the heater are arranged outside the material box. The control device controls the refrigerating unit, the heater and the vacuum pump. The material box is internally provided with a refrigerating pipe and a heating pipe at the same time, and the refrigerating pipe and the heating pipe are used for freezing and drying materials respectively. The inner wall of a material frame and the inner wall of the material box are each provided with a temperature sensor, and the temperature sensors monitor the temperature of the material frame and the temperature of the material box. Materials inside a material bottle are frozen in advance to reach the eutectic point approximately, then the temperature is decreased rapidly, and the materials pass through the eutectic point within the short time as little as possible, so that the grain size of crystals is effectively controlled, the fine freeze-drying powder is obtained, and the freeze-dried powder product quality is improved. The freezing cavity and the drying cavity are integrated, the technological steps are simplified, the occupied space is small, and refrigerating and heating are uniform.

Description

technical field [0001] The invention relates to the technical field of freeze-drying of medicines, in particular to a vacuum freeze-drying method and a vacuum freeze-drying machine. Background technique [0002] In the production of freeze-dried medicines, it is necessary to adjust the medicines to a liquid state, freeze them, and apply sublimation heat under a vacuum to sublimate the water in the materials and dry them. This process is carried out in a vacuum freeze dryer. The biggest obstacle preventing the more widespread application of freeze-drying technology is the high production cost. [0003] A general vacuum freeze dryer includes a freezing chamber, a drying chamber, a condensation chamber, a refrigeration system, a heating system and a control device. This kind of freeze dryer needs to be transported into the drying chamber after the medicine is frozen, so the process operation is complicated, the efficiency is low, and the number of equipment parts is large, an...

Claims

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Application Information

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IPC IPC(8): F26B5/06F26B25/00
Inventor 王晓勇孙明
Owner BEIJING HAIHETIAN TECH DEV
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