Environment-friendly phosphorus-free chelating agent and preparation method thereof

A chelating agent, an environmentally friendly technology, applied in the field of environmentally friendly phosphorus-free chelating agent and its preparation, can solve the problems of precipitation and affecting the use effect, achieve low solubility, improve the use effect, and improve the effect of environmental protection performance

Pending Publication Date: 2022-07-15
宜城成雄织造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chelating agents are widely used, but not all chelating agents have excellent chelating effect, so it is necessary to further improve the chelating performance and effect of chelating agents, and existing chelating agents may be damaged when used. A large amount of precipitation affects the use effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An environmentally friendly phosphorus-free chelating agent and a preparation method thereof, the preparation method of the chelating agent is as follows:

[0020] Step 1: Prepare sodium ethylenediamine di-o-phenylacetate, tetrasodium iminodisuccinate, and tetrasodium glutamic acid diacetate. Sodium amine di-o-phenylacetate has a strong anionic charge and is stable in high temperature, high pressure and strong acid-base aqueous solutions. The complex molecular structure contains a variety of valence bonds. It has high solubility in water and is compatible with other ingredients in the formula. , can improve the performance of the chelating agent, tetrasodium iminodisuccinate and tetrasodium glutamic acid diacetate can well integrate iron, calcium and magnesium ions, and at the same time have a stable effect on hydrogen peroxide. Mixture to reduce excessive phosphorus in sewage treatment.

[0021] Step 2: Prepare 0.1mol / L EDTA-2Na solution, add 600-700mL of freshly boil...

Embodiment 2

[0026] An environmentally friendly phosphorus-free chelating agent and a preparation method thereof, the preparation method of the chelating agent is as follows:

[0027] Step 1: Prepare 0.1mol / L EDTA-2Na solution, add 600-700mL of freshly boiled warm water and let it cool to 60-70℃, stir until completely dissolved. After cooling, pour it into a 1000mL volumetric flask, then boil the water and let it cool naturally and combine with EDTA-2Na solution, this solution is 0.1mol / L EDTA-2Na solution, and then prepare 0.1mol / L ferrous sulfate solution in In the beaker, add about 600mL of boiled and naturally cooled water, stir to dissolve completely, and then pour it into a 1000mL volumetric flask. 0.1mol / L EDTA-2Na solution is mixed in equal volume, EDTA-2Na solution and ferrous sulfate solution can prevent a large amount of precipitation during chelation, and then the obtained solution is mixed with step one;

[0028]Step 2: Add a certain amount of maleic anhydride, a catalyst and...

Embodiment 3

[0032] An environmentally friendly phosphorus-free chelating agent and a preparation method thereof, the preparation method of the chelating agent is as follows:

[0033] Step 1: Prepare sodium ethylenediamine di-o-phenylacetate, tetrasodium iminodisuccinate, and tetrasodium glutamic acid diacetate. Sodium amine di-o-phenylacetate has a strong anionic charge and is stable in high temperature, high pressure and strong acid-base aqueous solutions. The complex molecular structure contains a variety of valence bonds. It has high solubility in water and is compatible with other ingredients in the formula. , can improve the performance of the chelating agent, tetrasodium iminodisuccinate and tetrasodium glutamic acid diacetate can well integrate iron, calcium and magnesium ions, and at the same time have a stable effect on hydrogen peroxide. Mixture to reduce excessive phosphorus in sewage treatment.

[0034] Step 2: Prepare 0.1mol / L EDTA-2Na solution, add 600-700mL of freshly boil...

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PUM

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Abstract

The invention relates to the technical field of chelating agents, in particular to an environment-friendly phosphorus-free chelating agent and a preparation method thereof.The preparation method of the chelating agent comprises the following steps that sodium ethylenediamine diphenylacetate, tetrasodium iminodisuccinate and tetrasodium glutamate diacetate are prepared; tetrasodium iminodisuccinate and tetrasodium glutamate diacetate can well integrate iron, calcium and magnesium ions, have a stabilizing effect on hydrogen peroxide, do not replace a previous phosphorus-containing chelating agent with phosphorus, and reduce excessive phosphorus in sewage treatment, and have the beneficial effects that sodium gluconate has high-quality corrosion and scale inhibition effects, so that the stabilizing agent of the chelating agent is improved, and the stability of the chelating agent is improved; the environmental protection effect of the chelating agent can be improved due to corrosion and scale inhibition, citric acid is added, a chelate formed by citric acid and iron ions is low in solubility, a proper amount of ammonium salt is added to generate monoammonium citrate which is chelated with Fe < 3 + > and Fe < 2 + > ions, ammonium ferrous citrate and ammonium ferric citrate which are high in solubility are formed respectively, precipitates appear when rust is removed, and the effect of removing rust is achieved. The use effect of the chelating agent is improved.

Description

technical field [0001] The invention relates to the technical field of chelating agents, in particular to an environment-friendly phosphorus-free chelating agent and a preparation method thereof. Background technique [0002] Chelation is widely used in chemical research and industrial production. In the process of chemical industry and industrial production, adding chelating agents to form chelates with completely different properties of metal ions is the main method to reduce and control the concentration of metal ions. Chelates are widely used in mineral flotation process, hydrometallurgy, extraction and separation of metal elements, catalytic synthesis of substances, softening of water, electroplating process, pharmaceutical industry, dyeing process, etc. Chelates are widely used In chemical, mechanical and deinking pulp bleaching where hydrogen peroxide and hypochlorous acid are used as bleaching agents, some chelating agents can be used in medicine for the treatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F5/10
CPCC02F5/125C02F5/105C02F2303/08
Inventor 孟成雄孙菲刘洪波孟桥刘丹丹
Owner 宜城成雄织造有限公司
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