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Preparation method for zinc citrate

A technology of zinc citrate and citric acid, which is applied in the field of organic compound preparation, can solve the problems of unfavorable enterprise development and improvement of economic benefits, difficulty in reducing production costs, and adding automatic turning equipment, so as to reduce operating costs, reduce equipment costs, Reduce the effectiveness of protection and equipment

Inactive Publication Date: 2016-01-06
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual production method of zinc citrate is to utilize sodium citrate and zinc sulfate to react, and the product obtained is a viscous substance, which is difficult to further process and difficult to sell. The problems in this type of preparation method: 1. In the further processing step, drying The air permeability is not good, the moisture evaporates slowly, it is not easy to dry, and it is easy to smolder, which is very dangerous. It is necessary to increase the automatic turning equipment. There are many equipments, the complex production cost is high, and it is difficult to reduce the production cost; Mass production is not conducive to the development of enterprises and the improvement of economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of zinc citrate, the steps are as follows:

[0023] (1) Salt-forming reaction steps: Add 100 moles of citric acid, 55 moles of zinc oxide, 2 moles of formic acid, and 1500 moles of water to a 100-liter reactor with a heating device, electric stirring, and a thermometer, and heat to 70 moles while stirring. React at -80°C, react under stirring conditions for 6 hours, make carbon dioxide overflow, stop heating, the salt forming reaction is completed, and zinc citrate is obtained.

[0024] (2) Drying step: Centrifuge the zinc citrate obtained in step (1) to obtain granular zinc citrate, put the granular zinc citrate in a stainless steel drying sieve with upper and lower ventilation, and dry in a drying oven. After 24 hours, the The dried zinc citrate granules are sieved to obtain a finished product, and the content of the zinc citrate is measured to be greater than 15%.

Embodiment 2

[0026] A preparation method of zinc citrate, the steps are as follows:

[0027] (1) Salt-forming reaction step: Add 100 moles of citric acid, 55 moles of zinc oxide, 3 moles of formic acid, and 1500 moles of water to a 100-liter reactor with a heating device, electric stirring, and a thermometer, and heat to 70 moles while stirring. React at -80°C, react under stirring conditions for 6 hours, make carbon dioxide overflow, stop heating, the salt forming reaction is completed, and zinc citrate is obtained.

[0028] (2) Drying step: Centrifuge the zinc citrate obtained in step (1) to obtain granular zinc citrate, put the granular zinc citrate in a stainless steel drying sieve with upper and lower ventilation, and dry in a drying oven. After 24 hours, put The dried zinc citrate granules are sieved to obtain a finished product, and the content of the zinc citrate is measured to be greater than 15%.

Embodiment 3

[0030] A preparation method of zinc citrate, the steps are as follows:

[0031] (1) Salt-forming reaction steps: Add 100 moles of citric acid, 55 moles of zinc oxide, 4 moles of formic acid, and 1500 moles of water to a 100-liter reactor with a heating device, electric stirring, and a thermometer, and heat to 70 moles while stirring. React at -80°C, react under stirring conditions for 6 hours, make carbon dioxide overflow, stop heating, the salt forming reaction is completed, and zinc citrate is obtained.

[0032] (2) Drying step: Centrifuge the zinc citrate obtained in step (1) to obtain granular zinc citrate, put the granular zinc citrate in a stainless steel drying sieve with upper and lower ventilation, and dry in a drying oven. After 24 hours, put The dried zinc citrate granules are sieved to obtain a finished product, and the content of the zinc citrate is measured to be greater than 15%.

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Abstract

The invention relates to a preparation method for zinc citrate. The preparation method comprises the following steps: (1) a salt forming reaction step: adding citric acid, zinc oxide, an initiator and water in a molar ratio of 1 to 15 to (0.5-0.6) to (0.02-0.05) into a reaction kettle to obtain a mixture, heating the mixture to 70-80 DEG C while stirring, reacting the mixture for 5-7 hours for releasing carbon dioxide, thereby obtaining zinc citrate; and (2) a drying step: centrifugally separating the zinc citrate obtained in the step (1) to obtain granular zinc citrate, putting the granular zinc citrate into a drying sieve to dry in a drying oven, and sieving the granular zinc citrate after drying the granular zinc citrate, thereby obtaining a finished product zinc citrate. According to the preparation method, citric acid is used to replace sodium citrate and zinc oxide is used to replace zinc sulfate; the obtained product is zinc citrate which is single, high in purity, granular and easy to dry after being separated, so that spontaneous combustion risks are relieved; and the obtained product does not need to crush, so that much dust is avoided.

Description

technical field [0001] The invention belongs to the field of organic compound preparation, and relates to zinc citrate, in particular to a preparation method of zinc citrate. Background technique [0002] Among organic mineral additives for animal feed, zinc citrate, as an organic zinc mineral additive, has attracted more and more attention and has broad application prospects. The usual production method of zinc citrate is to utilize sodium citrate and zinc sulfate to react, and the product obtained is a viscous substance, which is difficult to further process and difficult to sell. The problems in this type of preparation method: 1. In the further processing step, drying The air permeability is not good, the moisture evaporates slowly, it is not easy to dry, and it is easy to smolder, which is very dangerous. It is necessary to increase the automatic turning equipment. There are many equipments, the complex production cost is high, and it is difficult to reduce the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/41
Inventor 张富强
Owner TIANJIN CHEM REAGENT RES INST
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