Production method of EDTA complex metal salt

A technology of EDTA and sodium EDTA, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as high energy consumption, reduced fertilizer efficiency, and decreased product quality, etc. The effect of increasing the reaction temperature, reducing the production cost, and reducing the production cost

Inactive Publication Date: 2003-07-02
钟林 +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] 2. EDTA·2Na is used as a complexing agent in the process. According to the above ratio, EDTA·2Na must be greatly excessive in sulfate, which increases the cost
[0014] 3. The proportion of water added in the process is too large, so that the finished product can only be in liquid form, and the content of EDTA complex metal salt is very low, only 1-10%
[0015] 4. The solid product obtained by reaction and concentration of a single sulfate + EDTA·2Na can be used in the process, but there is too much water in the reaction solution and too much energy consumption, which makes the cost too high and has no practical use value
Moreover, even if it is made into a solid finished product, the complex metal salt content is very low, only 25 to 40%, and has no practical use value.
[0016] 5. The quality of the products obtained by this process is poor. After years of actual production and application, it has been shown that there are many problems and defects:
Because of the existence of a large number of sulfate radicals, it is easy to make the soil salinized and reduce the fertilizer efficiency.
[0018] (2) Easy to leave and fall, and the applicable pH range is narrow
It can only be used in neutral soil. It is easy to precipitate EDTA in acidic environment and easy to produce metal

Method used

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Embodiment

[0065] In a 2000-liter reactor, the proportioning is as shown in the table below, adding ethylenediaminetetraacetic acid and sodium hydroxide to water, stirring and reacting to obtain sodium salt of ethylenediaminetetraacetic acid, then adding metal salts, controlling the temperature, time for the reaction to yield the product. When the metal salt is an iron salt, a solid-containing product is obtained, and the water-soluble inorganic salt impurities are removed by filtration, and the obtained solid is dried to obtain ethylenediaminetetraacetic acid complex iron salt (EDTAFeNa). When the metal salts are copper salts, manganese salts, zinc salts, and magnesium salts, after the liquid products are concentrated and dried, the solid products obtained are blue solid ethylenediaminetetraacetic acid complex copper salts (EDTA 2Na Cu), ethylenediaminetetraacetic acid complex manganese salt (EDTA·2Na·Mn) in light red powder, ethylenediaminetetraacetic acid complex zinc salt in white po...

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PUM

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Abstract

A process for preparing high-purity complexed metal salt of complexon used for trace-element fertilizer includes such steps as adding complexon and sodium hydroxide to water, stirring while reaction to obtain sodium salt of complexant, adding metal salt which is one of FeCl3, iron sulfate, manganese carbonate, alkaline copper carbonate, zinc oxide, etc., and reaction at 70-150 deg.C.

Description

technical field [0001] The invention relates to a method for producing chemical fertilizers, in particular to a method for producing high-purity single EDTA complex metal salt trace element fertilizers. Background technique [0002] There are two types of trace element fertilizers, one is sulfate, such as FeSO 4 .CuSO 4 .MnSO 4 .ZnSO 4 .MgSO 4 , the other is an upgraded product of sulfate, that is, sulfate + EDTA 2Na + (stabilizer urea), the principle of which is based on the production method is: [0003] <chemistry num="001"> <chem file="01133707_cml001.xml" / > < / chemistry> [0004] <chemistry num="002"> <chem file="01133707_cml002.xml" / > < / chemistry> [0005] <chemistry num="003"> <chem file="01133707_cml003.xml" / > < / chemistry> [0006] <chemistry num="004"> <chem file="01133707_cml004.xml" / > < / chemistry> [0007] <chemistry num="005"> <chem file="01133707_cml005.xml"...

Claims

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Application Information

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IPC IPC(8): C07C227/06C07C229/26C07C229/76
Inventor 钟林张祖银赵雪林
Owner 钟林
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