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Method for manufacturing low-lead granular zinc citrate

A zinc citrate, granular technology, which is applied in the granulation of special binders, pharmaceutical formulations, carboxylate preparations, etc., can solve the problems of non-viscosity and the formation of tiny powder particles, etc., to solve the problem of dust and high purity Effect

Inactive Publication Date: 2010-10-13
NANTONG FEIYU FINE CHEM
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Problems solved by technology

[0002] At present, the process route for the production of zinc citrate introduced in relevant domestic literature is: to use ordinary zinc oxide and citric acid to prepare it. Since medicinal and edible zinc citrate has special specifications, the lead content is <0.25ppm. It needs to be granulated for the manufacture of calcium tablets. The dry product of zinc citrate is not viscous. The lead content can only be controlled by the above method <20ppm, and the product can only form tiny powdery particles

Method used

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  • Method for manufacturing low-lead granular zinc citrate

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Embodiment

[0021] 1. produce zinc sulfate solution, filter and remove impurity, promptly by following weight ratio: zinc sulfate (by not containing crystal water): water=1: 3 makes zinc sulfate solution after fully reacting, filters, clarifies.

[0022] 2 react the prepared zinc sulfate solution (the content of zinc sulfate accounts for about 20%) with sodium bicarbonate, dissolve the sodium bicarbonate before the reaction, and then carry out metathesis according to the following weight ratio, zinc sulfate: sodium bicarbonate=1: 0.52) , the obtained zinc carbonate was dehydrated, washed, dried, cooled, and sub-sieved to obtain material A.

[0023] 3. The above-mentioned material A, edible citric acid and water are according to the following weight ratio, material A: edible citric acid: water=1: 0.86: 4, are prepared into a solution and carry out chemical reaction, the reaction temperature is controlled between 70~100 ℃, the reaction The pH value of the solution is ≥7.

[0024] 4 Control...

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Abstract

The invention relates to a method for manufacturing low-lead granular zinc citrate, which is characterized in that: a raw material, namely zinc sulphate, is changed into soluble zinc sulphate solution, so that insoluble impurities in the zinc sulphate are more completely filtered out. However, the insoluble impurities cannot be separated out by the ordinary zinc oxide method and then are mixed in the final product. The steps of adding dilute acetic acid can effectively control the content of lead, so that the purity of the obtained zinc citrate is higher. The last step prevents the generation of dust in the production and the formation of particles. The problem on dust is solved.

Description

technical field [0001] The invention relates to a method for producing ultra-low lead granular zinc citrate. Background technique [0002] At present, the process route for the production of zinc citrate introduced in relevant domestic literature is: to use ordinary zinc oxide and citric acid to produce it. Since medicinal and edible zinc citrate has special specifications, the lead content is <0.25ppm. It needs to be granulated for the manufacture of calcium tablets, and the dry product of zinc citrate is not viscous, and the lead content that can only be controlled by the above method is less than 20ppm, and the product can only form tiny powdery particles. Contents of the invention [0003] Aiming at the above production shortcomings, the present invention provides a method for producing ultra-low lead granular zinc citrate, which utilizes zinc sulfate and industrial sodium bicarbonate to react to generate zinc carbonate, and then prepares zinc citrate with edible ci...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/41A61K31/194A23L1/30A61P3/02A61K9/14B01J2/28
Inventor 姚建飞
Owner NANTONG FEIYU FINE CHEM
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