Method for drying or concentrating at near freezing temperature and device thereof

Abstract

The invention discloses a method for drying or concentrating at near freezing temperature and a device thereof, aiming at providing a method for removing liquid from material at near freezing temperature, which can keep cells of the materials from being damaged and retain original taste and nutritional ingredients or effective ingredients of the materials, and a device applied in the method. The method comprises the following steps: cooling the materials containing liquid to the range from below 0 DEG C to freezing points of the materials (excluding the freezing points), and evaporating the liquid in the materials in vacuum state to obtain the product. The invention combines the maintenance of the drying or concentrating temperature in the range from below 0 DEG C to freezing points of the materials and the condition of vacuum to realize original state drying or concentrating of the materials, thus retaining mouth feel and taste, and nutritional ingredients or effective ingredients of the materials at utmost, and ensuring the quality of the product at utmost. The change of color and taste of the food is slight, and the freshness is very good.

Description

technical field [0001] The present invention relates to a method and equipment for drying or concentrating, more specifically, relates to a method and equipment for drying or concentrating near freezing temperature. Background technique [0002] In the production process in various fields, it is often necessary to remove all or part of the water or other solvents in the material (ie drying or concentration) to obtain a dry product or a concentrated product. At present, the methods used are mainly hot air drying, spray drying, film drying and freeze drying and other methods. [0003] The patent application number is 2006101124577, and the patent application titled "ultrasonic freeze-drying method and its equipment" discloses a method of using ultrasound to assist the sublimation of solids to achieve the purpose of freeze-drying. Compared with other freeze-drying methods, although Some technological progress has been made, but since the material is prone to bumping during the...

AI Technical Summary

Problems solved by technology

[0004] Existing drying devices have shortcomings in various aspects, such as complicated equipment structure and complicated operation process, some of which will cause losses to the ingredients of the dried materials, and cause the loss of nutrients in the materials, etc.

Moreover, the equipment used in the vacuuming method does not have a water vapor capture design, and the extracted water vapor is directly discharged into the air, which is easy to pollute the environment. At the same time, a high-power vacuum pump is required, which consumes a lot of energy.

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