Preparation method for D-mannose crystals

A technology of mannose and mannose, applied in the field of functional sugar, can solve the problems of small crystal grains, thick mother liquor, low yield, etc., and achieve the effects of reducing the number of crystallization times, increasing the crystallization yield, and shortening the technological process.

Inactive Publication Date: 2014-01-08
山东福田科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the existing D-mannose crystallization process has problems such as thick mother liquor, small crystal grains, and low yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Decolorization

[0018] The mannose syrup was heated to 75°C, the amount of activated carbon added was 5% of the dry matter, stirred and kept for 30 min, and vacuum filtration was performed to obtain a decolorizing solution with a light transmission >99.7%.

[0019] 2. Electrodialysis desalination

[0020] Cool the decolorizing solution to 35°C and add it to the clean room of the electrodialyzer, the conductivity is reduced from 2260 μs / cm to 8 μs / cm, and the purpose of desalination is achieved.

[0021] 3. Evaporation and concentration

[0022] The mannose syrup desalinated by electrodialysis was vacuum-concentrated at 75°C until the refraction of the dry matter was above 96%, and 600g of mannose paste was obtained.

[0023] 4. Crystallization

[0024] Add 1.5 times the volume of absolute ethanol to the obtained mannose paste to keep warm at 75°C, stir evenly with a stirrer, and then use an automatic temperature controller to control the temperature ...

Embodiment 2

[0026] 1. Decolorization

[0027] The mannose syrup was heated up to 80°C, the amount of activated carbon added was 2% of the dry matter, stirred and kept for 20 minutes, and vacuum filtration was performed to obtain a decolorizing solution with a light transmission >99.7%.

[0028] 2. Electrodialysis desalination

[0029] Cool the decolorizing solution to 40 °C and add it to the clean room of the electrodialyzer, the conductivity drops from 2260 μs / cm to 6.38 μs / cm, achieving the purpose of desalination.

[0030] 3. Evaporation and concentration

[0031] The mannose syrup desalinated by electrodialysis was vacuum-concentrated at 80°C until the refraction of the dry matter was above 96%, and 750g of mannose paste was obtained.

[0032] 4. Crystallization

[0033] Add 1 volume of absolute ethanol to the obtained mannose paste and keep it warm at 75°C, then use an automatic temperature controller to control the temperature to 50°C with a gradient of 1°C / h, then n...

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Abstract

The invention provides a preparation method for D-mannose crystals. The method includes adding activated carbon into mannose slurry to perform heating and discoloration, then performing desalination and purification, performing evaporation and concentration, and soaking in absolute ethyl alcohol for purification and drying to obtain high-purity crystal D-mannose. By the aid of the method that the activated carbon is used for discoloration and electrodialysis desalination, evaporation and concentration are performed until the slurry is almost oven dry and the absolute ethyl alcohol is used for soaking the obtained crystals, the problems of viscous mother liquid, small crystals, low yield and the like in the existing D-mannose crystallization process are solved. On the basis of the traditional technology, an advanced electrodialysis desalination technique replaces ion exchange, crystallization time ranges from 20 hours to 30 hours, a technological process is shortened, and energy conservation and consumption reduction are achieved; crystallization times are decreased, and crystallization yield of the mannose crystals is increased.

Description

technical field [0001] The invention belongs to the field of functional sugars, in particular to a method for preparing D-mannose crystals. Background technique [0002] D-mannose is a white powder crystal with a sweet taste, about 0.6 times that of sucrose and 0.86 times that of glucose. Soluble in water, slightly soluble in ethanol (0.4%), insoluble in ether. As a six-carbon sugar, it exists less in the free state in nature, and mostly exists in the form of mannan, for example, it exists in the konjac of Araceae plants, which is oligomannose. [0003] D-mannose is used in food and beverage as a sweetener; in medicine, some research data in the United States show that mannose has bactericidal and anti-inflammatory effects, and is good for diseases such as diabetes, obesity, constipation and high cholesterol. Therapeutic effect. [0004] Chinese patent CN101851689A discloses a preparation process of D-mannose crystals. The mixed liquid obtained by isomerizing glucose as r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H1/06
Inventor 孙鲁王成福崔静杜瑞锋邱学良黄伟红邵竞峰
Owner 山东福田科技集团有限公司
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