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Method for extracting vitamin C and 2-keto-L-gulonic acid from vitamin C mother liquor

A vitamin and coronic acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of affecting product yield, increasing environmental pollution, and high production costs, achieving good economic and social benefits, and increasing economic Benefit, avoid the effect of polluting the environment

Active Publication Date: 2009-10-14
ZHENGZHOU TUOYANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of producing vitamin C, a large amount of vitamin C mother liquor is produced, and the vitamin C mother liquor contains about 23% of unreacted 2-keto-L-gulonic acid and about 15% of vitamin C; due to the components in the vitamin C mother liquor They interfere with each other and cannot be recrystallized. Therefore, they are generally discharged as waste in industry; such treatment not only causes high production costs, but also affects product yield and increases environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 2000mL of vitamin C mother liquor, of which, the content of 2-keto-L-gulonic acid is 225g / L, which is equivalent to 450g of pure 2-keto-L-gulonic acid, and the content of vitamin C is 132g / L, which is equivalent to 264g of pure vitamin C;

[0022] Put the vitamin C mother liquor in a beaker with a volume of 3000ml, keep it at 52°C, add sodium carbonate, stir and neutralize it until the pH value is 6, then add 10g of activated carbon, heat up to 60°C, and continue stirring for 10 minutes to decolorize. insulation filter;

[0023] Then, the filtrate was concentrated under reduced pressure to 1000ml, cooled to 12°C, and kept for 6 hours, and the precipitated 2-keto-L-gulonic acid sodium was separated by filtration and washed with a small amount of ice water. Sodium acid wet product was dissolved into an aqueous solution with a content of 35%, the sodium ions were removed by cation exchange resin, the ion exchange liquid was conventionally concentrated and crystallized...

Embodiment 2

[0026] Take 2000mL of vitamin C mother liquor, of which, the content of 2-keto-L-gulonic acid is 232g / L, which is equivalent to 464g of pure 2-keto-L-gulonic acid, and the content of vitamin C is 137g / L, which is equivalent to 274g of vitamin C;

[0027] Put the vitamin C mother liquor in a beaker with a volume of 3000ml, heat up under stirring, maintain the temperature at 45°C, react with calcium carbonate until the pH value is 5, add 10g of activated carbon, raise the temperature to 60°C, continue to stir for 10 minutes to decolorize, keep warm and filter ;

[0028] Then the filtrate was concentrated under reduced pressure to 1000ml, cooled to 10°C, and kept for 2 hours. The precipitated calcium 2-keto-L-gulonic acid was separated by filtration and washed with a small amount of ice water. The 2-keto-L-gulonic acid The salt wet product was dissolved into an aqueous solution with a content of 35%, and the calcium ions were removed through a cation exchange resin. The ion excha...

Embodiment 3

[0031] Take 2000mL of vitamin C mother liquor, of which, the content of 2-keto-L-gulonic acid is 227g / L, which is equivalent to 454g of 2-keto-L-gulonic acid salt, and the content of vitamin C is 142g / L, which is equivalent to 284g of vitamin C;

[0032] Put the vitamin C mother liquid in a beaker with a volume of 3000ml, raise the temperature under stirring, maintain the temperature at 55°C, neutralize it with saturated sodium hydroxide until the pH value is 7, add 10g of activated carbon, raise the temperature to 60°C, continue to stir for 10 minutes to decolorize, and keep warm filter;

[0033] Then the filtrate was concentrated under reduced pressure to 1000ml, cooled to 15°C, and kept for 10 hours. The precipitated 2-keto-L-gulonic acid sodium was separated by filtration, washed with a small amount of ice water, and the 2-keto-L-gulonic acid The sodium wet product was dissolved into an aqueous solution with a content of 35%, and the sodium ions were removed by a cation ex...

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Abstract

The invention provides a method for extracting a vitamin C and 2-keto-L-gulonic acid from a vitamin C mother liquor, comprising the following steps of: counteracting the vitamin C mother liquor, generating a vitamin C salt and a 2-keto-L-gulonic acid salt and obtaining a salt solution; mixing and cooling the salt solution so as to separate the 2-keto-L-gulonic acid salt out from the salt solution; dissolving the 2-keto-L-gulonic acid salt by water; removing cation by a cation exchange resin; obtaining the 2-keto-L-gulonic acid by concentrating, crystallizing and separating; taking the salt solution with the 2-keto-L-gulonic acid salt separated out and removing the cation ion by the cation exchange resin; and obtaining the vitamin C by concentrating, crystallizing and separating. The method has scientific process, simple operation, strong practicability, good separation effect and high recovery rate, increases economic benefits, avoids polluting the environment and has excellent economic benefits and social benefits.

Description

technical field [0001] The invention relates to a process for recovering and treating vitamin C mother liquor, in particular to a method for extracting vitamin C and 2-keto-L-gulonic acid from the vitamin C mother liquor. Background technique [0002] Vitamin C is one of the essential elements to maintain life activities. It has a series of physiological functions of ascorbic acid, blood pressure lowering, diuresis, pigment excretion and detoxification. In addition to being used as a medicine for Vc deficiency, it is also a nutritional enhancer and food antioxidant. It can also be used as a cosmetic agent, and it has also been used in metallurgy, papermaking and other industries. Vitamin C is currently the vitamin product with the largest production and sales volume and a wide range of applications in the world. [0003] At present, the production process of vitamin C at home and abroad adopts a two-step fermentation method, that is, D-sorbose is directly fermented into 2-ke...

Claims

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Application Information

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IPC IPC(8): C07D307/62C07C59/215C07C51/42
Inventor 王敬臣崔凤霞秦汝杰秦天仓曹琳青陈黎周俊俊张抗高莉
Owner ZHENGZHOU TUOYANG IND
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