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Combined drying method

A combined drying and sublimation drying technology, applied in the processing field, can solve the problems of aroma loss, loss of heat-sensitive substances, rising, etc., and achieve the effect of retaining flavor and high nutritional value

Active Publication Date: 2012-02-08
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to ensure thorough drying, the temperature of the product at this stage needs to be high enough, and the analytical drying stage often maintains a relatively high temperature (80-100°C), causing the temperature of the material to eventually rise to this temperature, which affects the temperature of the material to a certain extent. Quality, causing loss of heat-sensitive substances, especially aroma loss and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This example takes red bayberry as raw material to prepare red bayberry powder, and the concrete steps are as follows:

[0016] (1) Raw material pretreatment

[0017] The raw materials are cleaned to remove impurities, squeezed to obtain raw bayberry juice, and then freeze-concentrated to obtain concentrated bayberry juice with a concentration of 23Brix.

[0018] (2) Pre-cooling and quick-freezing bayberry juice

[0019] Put the bayberry juice into a plate and pre-cool it, then put it into the quick-freezing warehouse for quick freezing. The thickness of the material is 1-2cm, the pre-freezing temperature is -50-45°C, the pre-freezing time is 2-3h, and the temperature of the center of the material is -40~ -45°C;

[0020] (3) Sublimation drying

[0021] Put the pre-frozen material into the drying chamber of the vacuum freeze dryer. The temperature of the cold trap is -45~-50°C, the vacuum degree is 40-80Pa, the temperature of the heating plate is 50-60°C, and it is m...

Embodiment 2

[0027] In this example, green tea is taken as an example to make instant tea powder. The steps are as follows:

[0028] (1) Raw material pretreatment

[0029] After the tea leaves are washed, extracted, filtered and concentrated by reverse osmosis to obtain concentrated green tea juice with a concentration of 21% (w / w).

[0030] (2) Pre-cooling and quick freezing of tea juice

[0031] Put the tea juice on a plate and pre-cool it, put it into the quick-freezing bin for quick freezing, the thickness of the material is 1-2cm, the pre-freezing temperature is -50-45°C, the pre-freezing time is 2-3h, and the temperature of the center of the material is -40-- 45°C;

[0032] (3) Vacuum freeze drying

[0033] Put the pre-frozen material into the drying bin of the vacuum freeze dryer. The temperature of the cold trap is -45~-50°C, the vacuum degree is 40-80Pa, the temperature of the heating plate is 70-80°C, and keep for 5-6h. When the temperature rises to 10°C, the water content i...

Embodiment 3

[0039] This example takes dried abalone polysaccharide as an example, and the specific steps are as follows:

[0040] (1) Extraction of abalone polysaccharide.

[0041] The abalone polysaccharide solution obtained after mincing abalone meat, cold water extraction, filtration, alcohol precipitation and other processes, the concentration is 6% (w / w).

[0042] (2) Precooling and quick freezing of abalone polysaccharide solution

[0043] Put the abalone multi-soluble sugar solution on a plate and pre-cool it, then put it into the quick-freezing bin for quick-freezing. The thickness of the material is 1-2cm, the pre-freezing temperature is -50--45°C, and the pre-freezing time is 2-3h, until the material center temperature is -40~-45℃;

[0044] (3) Vacuum freeze drying

[0045] Put the pre-frozen abalone polysaccharide solution into the drying chamber of the vacuum freeze dryer, the temperature of the cold trap is -45~-50°C, the vacuum degree is 40-80Pa, the temperature of the h...

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Abstract

The invention discloses a combined drying method. Traditional vacuum freezing drying is divided into two stages of sublimation drying and analysis drying, wherein the analysis drying is characterized by removing bound water from materials at a higher temperature of 60-90 DEG C. The combined drying method comprises the following steps: firstly, removing most of the water from the materials by utilizing the sublimation stage of the vacuum freezing drying; replacing the higher temperature analysis stage by an absorption drying process; placing a period of time under the state of vacuum normal temperature; and removing the remained bound water through absorption drying, wherein the temperature of the materials is not above 20-30 DEG C during the whole process. By adopting the combined drying method, the influence of higher temperature on the quality of raw materials during a traditional analysis drying process is avoided. The combined drying method is suitable for the drying of a thermal sensitive product. A prepared product is high in nutritional value, and the flavor and color of the product are remained to a great extent.

Description

technical field [0001] The invention belongs to the field of processing, and in particular relates to a combined drying method. Background technique [0002] Combined drying refers to a composite drying technology in which two or more drying methods are carried out in stages according to the characteristics of the material in accordance with the principle of complementary advantages, such as hot air-microwave combined drying, hot air-freezing combined drying, hot air- Microwave vacuum combined drying, hot air-microwave freeze combined drying, hot air-pressure puffing combined drying, penetration-hot air combined drying, etc. It is a product developed by combining various drying methods, and it is a comprehensive and highly applied technology. [0003] The patent application No. 201010153889 discloses a combined drying that improves the dehydration efficiency of corn. The drying technology consists of two / three stages: hot air / microwave drying is used in the early stage, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/44A23L3/3427
Inventor 陈锦权方婷翁乔丹
Owner FUJIAN AGRI & FORESTRY UNIV
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