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Equipment and method for preparing crystal of vitamin C by fine crystal removing method

A technology of vitamin and elimination method, applied in the direction of organic chemistry, etc., can solve the problems of ineffective control of product particle size distribution, difficulty in eliminating a large number of fine crystals of products, etc., and achieve the effects of increasing crystallization yield, reducing degradation, and reducing dissolution temperature

Inactive Publication Date: 2005-10-26
天津市北洋方菱工业结晶科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a device and method for preparing vitamin C crystals by using the method of eliminating fine crystals, so as to overcome the shortcomings of the existing technology that it is difficult to eliminate a large number of fine crystals in the product and cannot effectively control the particle size distribution of the product

Method used

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  • Equipment and method for preparing crystal of vitamin C by fine crystal removing method
  • Equipment and method for preparing crystal of vitamin C by fine crystal removing method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] use as figure 1 device shown. Add 600ml of deionized water into the dissolving tank, preheat to 60°C, add 600g of crude vitamin C with a purity of 98.5%, stir together, heat to 66.5°C to dissolve, add 7.5g of activated carbon to decolorize for 2 minutes, and filter to obtain 950ml of vitamin C solution , which is introduced into crystallizer 1 with a total volume of 1200ml.

[0024] The initial temperature of the solution in the crystallizer 1 is 55°C, and the initial temperature of the cooling medium ethylene glycol aqueous solution 6 is 45°C. By controlling the temperature of the circulating cooling medium 6, the temperature of the solution in the crystallizer is lowered at a rate of 0.15° C. / min under the agitation of the propeller stirrer. When the temperature of the solution reached 41.5° C., 0.24 g of vitamin C crystals passed through a 100-mesh standard sieve were added as seed crystals, and the crystals were grown at a constant temperature for 30 minutes. Con...

Embodiment 2

[0026] use as figure 1 device shown. Add 600ml of deionized water into the dissolving tank, preheat to 60°C, add 610g of crude vitamin C with a purity of 98.5%, stir together, heat to 68°C to dissolve, add 9g of activated carbon for decolorization for 2 minutes, filter to obtain 955ml of vitamin C solution, It was introduced into crystallizer 1 with a total volume of 1200 ml.

[0027] The initial temperature of the solution in the crystallizer 1 is 55.3°C, and the initial temperature of the cooling medium ethylene glycol aqueous solution 6 is 45°C. By controlling the temperature of the circulating cooling medium 6, the temperature of the solution in the crystallizer is lowered at a rate of 0.18°C / min under stirring. When the temperature of the solution reaches 40.2°C, nucleation occurs spontaneously, and the crystal is grown at a constant temperature for 30 minutes. Continue cooling. When the crystallization temperature reaches 22.5°C, add 40ml of antifreeze methanol. When ...

Embodiment 3

[0029] use as figure 2device shown. Add 1200ml of deionized water into the dissolving tank, preheat to 40°C, add 600g of crude vitamin C with a purity of 98.5%, stir together, heat to 47°C to dissolve, add 9g of activated carbon for decolorization for 2 minutes, and filter to obtain 1530ml of vitamin C solution, It was introduced into crystallizer 1 with a total volume of 2000 ml.

[0030] The initial temperature of the solution in the crystallizer 1 is 45.3°C, and the temperature of the circulating hot water 7 is controlled at 60°C. Turn on the crystallizer stirring and vacuum system 9, and the vacuum degree in the crystallizer 1 is controlled to be about -0.09MPa. When the solution reaches about 47°C, it begins to evaporate. The hot water 7 in the jacket of the crystallizer 1 is switched to the cooling medium ethylene glycol aqueous solution 6, and the vacuum system 9 is closed.

[0031] By controlling the temperature of the circulating cooling medium 6, the temperature ...

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Abstract

The present invention relates to an equipment and its method for preparing vitamin C crystal by adopting fine crystal eliminating method. Said equipment nicludes crystallizer with jacket, fine crystal dissolving device, condensation device, vacuum system and distillate collecting device. Said invention also provides the concrete structure of the above-mentioned every device and their connection mode, also provides the concrete steps of said method.

Description

technical field [0001] The invention belongs to the technical field of crystallization, and in particular relates to a device and a method for preparing vitamin C crystals by adopting a fine crystal elimination method. Background technique [0002] Vitamin C, the chemical name is 3-oxo-L-gulofurano lactone (3-oxo-L-gulofurano lactone), also known as L-ascorbic acid (L-ascorbic acid). [0003] Vitamin C is one of the most productive and widely used varieties of vitamin drugs. It is a nutrient that is necessary for the human body but cannot be synthesized by itself. It participates in various metabolisms in the body, can inhibit the peroxidation of free radicals in the body, and promote various hormones in the body. The synthesis of vitamin C plays an increasingly important role in people's life and health, so people pay more and more attention to the improvement of vitamin C production technology and product quality. [0004] At present, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/62
Inventor 王静康尹秋响张美景王永莉侯宝红陈慧萍
Owner 天津市北洋方菱工业结晶科技有限公司
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