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A kind of preparation method of ammonium zinc citrate

A technology of zinc ammonium citrate and zinc citrate, applied in the field of preparation of zinc ammonium citrate, can solve problems such as time-consuming and energy consumption, difficulty in washing sediment, pollution, etc., and achieve low content of impurities and harmful substances, and a post-processing process. Simple, speed-up effect

Inactive Publication Date: 2020-01-14
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By consulting the literature, it is found that the existing synthetic methods of zinc ammonium citrate mostly use inorganic salts to react with alkali to obtain zinc hydroxide, and then react with citric acid and ammonia water in turn to obtain zinc ammonium citrate. Zinc is a colloidal precipitate, which is difficult to wash, high energy consumption, serious pollution, and low production efficiency. In addition, it also has a certain adsorption effect, which will adsorb harmful substances such as heavy metal ions and impurities in the water, affecting the purity and quality of the final product. food safety
In addition, there is also a method for preparing zinc ammonium citrate with zinc oxide as a raw material in the prior art, and its disadvantages are: 1. the purity of zinc oxide is difficult to achieve high purity, so the final product prepared with it as raw material usually only uses As an additive for plant fertilizers or as a regulator of plant trace elements, there are food safety problems when it is used to supplement zinc for the human body, and when the purity of zinc oxide reaches more than 99.7%, the price rises, and the cost of producing zinc ammonium citrate with it as raw material will greatly improve; ② the intermediate process of its production needs to obtain an aqueous solution of zinc citrate, and zinc citrate is only slightly soluble in water, so a large amount of water needs to be used in the production process, and the concentration and concentration after adding ammonia water to generate zinc ammonium citrate Drying takes a lot of time and energy, resulting in low production efficiency and high production costs

Method used

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  • A kind of preparation method of ammonium zinc citrate
  • A kind of preparation method of ammonium zinc citrate

Examples

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Effect test

Embodiment 1

[0017] A preparation method of zinc ammonium citrate, comprising the steps of: first, dissolving citric acid in distilled water to obtain a citric acid solution with a concentration of 10 wt%, adding zinc powder to the citric acid solution under magnetic stirring at 30°C , the molar ratio of the zinc powder to the citric acid was 1:1, and a small amount of white precipitate was precipitated after 10 minutes of reaction; subsequently, adding a concentration of 15 wt% hydrogen peroxide to the citric acid solution, the zinc powder and the citric acid H in hydrogen peroxide 2 o 2 The molar ratio is 1:1, keep the reaction temperature of 30°C and continue to stir the reaction for more than 2 hours, a large amount of white precipitates precipitate out, filter, wash, and dry to obtain white powdery zinc citrate; finally, add the zinc citrate to the concentration In 10wt% ammonia, the zinc citrate and the NH in the ammonia 3 ·H 2 The molar ratio of O is 1:1, stir for 10 minutes, fil...

Embodiment 2

[0019] A preparation method of ammonium zinc citrate, comprising the steps of: first, dissolving citric acid in distilled water to obtain a citric acid solution with a concentration of 20 wt%, adding zinc powder to the citric acid solution under magnetic stirring at 40°C , the molar ratio of the zinc powder to the citric acid was 1:1.2, and a small amount of white precipitate was precipitated after 12 minutes of reaction; subsequently, adding a concentration of 20 wt% hydrogen peroxide to the citric acid solution, the zinc powder and the citric acid H in hydrogen peroxide 2 o 2 The molar ratio is 1:1.05, keep the reaction temperature of 40°C and continue to stir the reaction for more than 2 hours, a large amount of white precipitates are precipitated, filtered, washed, and dried to obtain white powdery zinc citrate; finally, add the zinc citrate to the concentration In 15wt% ammonia, the zinc citrate and the NH in the ammonia 3 ·H 2 The molar ratio of O is 1:1.05, stir for ...

Embodiment 3

[0021] A preparation method of zinc ammonium citrate, which comprises the following steps: first, citric acid is dissolved in distilled water to obtain a citric acid solution with a concentration of 35 wt%, and zinc powder is added to the citric acid solution under magnetic stirring at 50°C , the molar ratio of the zinc powder to the citric acid is 1:1.3, reacted for 15min, and a small amount of white precipitate was precipitated; subsequently, adding a concentration of 25wt% hydrogen peroxide to the citric acid solution, the zinc powder and the citric acid H in hydrogen peroxide 2 o 2 The molar ratio is 1:1.1, keep the reaction temperature of 50°C and continue to stir the reaction for more than 2 hours, a large amount of white precipitates are precipitated, filtered, washed, and dried to obtain white powdery zinc citrate; finally, add the zinc citrate to the concentration In 25wt% ammonia, the zinc citrate and the NH in the ammonia 3 ·H 2 The molar ratio of O is 1:1.1, sti...

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Abstract

The invention relates to a preparing method of zinc-ammonium citrate. The method comprises the steps of firstly dissolving citric acid into distilled water to obtain a citric acid solution, and adding zinc powder into the citric acid solution under magnetic stirring to conduct a reaction for 10-15 min; subsequently adding hydrogen peroxide into the citric acid solution, continuing stirring the mixture and conducting a reaction for 2 hours or above, and filtering, washing and drying the mixture to obtain white-powdery zinc citrate; finally adding strong ammonia water into zinc-ammonium citrate, stirring the mixture for 10-20 min, and conducting filtering, washing and vacuum drying on the product to obtain zinc-ammonium citrate. The preparing method of zinc-ammonium citrate has the advantages that zinc powder is adopted as a raw material, and has high purity and contains few impurities and hazardous substances, and prepared zinc-ammonium citrate can be adopted as an edible zinc-replenishing reinforcing agent; the preparing method is relatively simple, in the preparing process, zinc does not need to be fully converted into an aqueous solution of zinc citrate, instead, zinc citrate white powder is directly obtained, zinc hydroxide colloidal precipitate also does not occur in the middle process, thus waste of water resources can be sharply reduced, and the cost in concentration and wastewater treatment is reduced.

Description

technical field [0001] The invention relates to a zinc supplement fortifier, in particular to a preparation method of ammonium zinc citrate. Background technique [0002] Zinc ammonium citrate is a white crystalline particle, easy to absorb moisture, soluble in water to become white turbid, and insoluble in ethanol, ether and other organic solvents. Zinc ammonium citrate has a simple production process, high zinc content, non-irritating, high absorption rate, safe and reliable, and is an ideal zinc supplement enhancer. Therefore, the development and production of ammonium zinc citrate has broad application prospects. By consulting the literature, it is found that the existing synthetic methods of zinc ammonium citrate mostly use inorganic salts to react with alkali to obtain zinc hydroxide, and then react with citric acid and ammonia water in turn to obtain zinc ammonium citrate. Zinc is a colloidal precipitate, which is difficult to wash, high energy consumption, serious ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C59/265
CPCC07C51/412C07C59/265
Inventor 王石泉闵飞霞高伟杨创吴慧敏艾照全周立群冯传启李启林
Owner HUBEI UNIV