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Preparation method of calcium propionate

A technology of calcium propionate and propionic acid, which is applied in the field of food additives, can solve the problems of dust-producing calcium carbonate impurities, high labor intensity, excessive alkali content, etc., and achieve the effect of stable product quality

Inactive Publication Date: 2013-05-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the unstable cooking process, it is easy to cause carbon dioxide in the air to react with the generated calcium propionate to produce dust and calcium carbonate impurities.
Also, when preparing calcium propionate by reacting calcium hydroxide or calcium oxide, adjust the pH of the reaction to 8-9, and then adopt the method of spray drying, which is easy to cause the amount of alkali to exceed the standard

Method used

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  • Preparation method of calcium propionate

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Add 1 kg of calcium hydroxide to 9.8 kg of water, adjust the pH to 6.9 with propionic acid under stirring, and filter. 10 grams of activated carbon and 10 grams of diatomaceous earth were added to the filtrate, stirred and adsorbed for 10 minutes, filtered through micropores, and the filtrate was spray-dried to obtain a product with a purity of 99.6%.

Embodiment 2

[0016] Add 1 kg of calcium hydroxide to 14 kg of water, adjust the pH to 6.9 with propionic acid under stirring, and filter. 10 grams of activated carbon and 10 grams of diatomaceous earth were added to the filtrate, stirred and adsorbed for 10 minutes, filtered through micropores, and the filtrate was spray-dried to obtain a product with a purity of 99.2%.

Embodiment 3

[0018] Add 1 kg of calcium hydroxide to 9.8 kg of water, adjust the pH to 6.9 with propionic acid under stirring, and filter. 20 grams of activated carbon and 10 grams of diatomaceous earth were added to the filtrate, stirred and adsorbed for 10 minutes, filtered through micropores, and the filtrate was spray-dried to obtain a product with a purity of 99.8%.

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Abstract

The invention aims at providing a preparation method of calcium propionate. The preparation method comprises the following steps of: reacting calcium hydroxide with metacetonic acid, controlling reaction pH value in the range from 6.5 to7.0 to remove alkali residue in a product, removing excessive acid in a drying process, adsorbing the filtrate after filtration through a mixed adsorbent to remove impurity caused by the metacetonic acid and the calcium hydroxide, and obtaining a calcium propionate product by spraying drying, wherein whiteness purity of the calcium propionate product is greater than 99%.

Description

technical field [0001] A method for preparing calcium propionate belongs to the technical field of food additives. technical background [0002] Calcium propionate has the function of killing mold, aerobic bacillus and Gram-negative bacteria. It can not only prolong the freshness period of food and feed, but also can be absorbed by humans and animals through metabolism and provide necessary calcium. It is widely used It is used as antiseptic for food and feed. At present, the preparation process of calcium propionate mainly adopts the reaction of propionic acid and calcium hydroxide or calcium carbonate or calcium oxide. Calcium carbonate is used as a calcium source, and the product has high purity, but carbon dioxide gas is released during the reaction, which will take away unreacted propionic acid, resulting in a decrease in yield. When calcium hydroxide or calcium oxide is reacted to prepare calcium propionate, the pH of the reaction is adjusted to 8-9, and then dehydra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/122C07C51/41C07C51/47
Inventor 史苏佳曹栋王强魏长庆
Owner JIANGNAN UNIV