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Method for synthesizing EDTA (ethylene diamine tetraacetic acid) calcium sodium salt hydrate by low molecular alcohol precipitation at low boiling point

A technology of low molecular weight and alcohol analysis, applied in chemical instruments and methods, preparation of organic compounds, chemical industry, etc., to achieve high environmental protection benefits, good promotion benefits, and low investment risks

Inactive Publication Date: 2018-03-13
SICHUAN LUTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this method to produce EDTA calcium sodium salt has not yet been publicly released

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 200g of desalted water to the beaker, put it into an electric heating mantle and heat to 80°C; stir with a magnetic rotor, and set the rotation speed to 360 rpm; then add 40g of disodium EDTA to the desalted water until the solids in the solution are completely dissolved Finally, slowly add 10g of calcium oxide, and react for 0.5 hours after all the materials are added, then adjust the pH of the solution to 7.02 with disodium EDTA; , sealed and allowed to stand for 4 hours, then filtered, and the filtered product was baked in a 90°C oven to constant weight and then packed into bags to obtain the EDTA calcium sodium salt product; then the filtrate was transferred to a flask and rectified at 80°C for 35 190 g of the methanol component and 188 g of the aqueous solution component were obtained in 1 minute. Detected by atomic absorption spectrometry, the calcium content in EDTA calcium sodium salt product is 9.54%. Dissolve 1g of this product in 99g of water, add 1g of p...

Embodiment 2

[0030] Add 188 g of the aqueous solution obtained from distillation in Example 1 and 20 g of the desalted water mixture into the beaker, put it into an electric heating mantle and heat it to 80° C.; stir with a magnetic rotor, and set the number of revolutions to 360 revolutions per minute; Add 30g disodium EDTA in the mixed solution, after the solid in the solution dissolves completely, then slowly add 7g of calcium oxide, react for 0.5 hour after all the materials are added, then adjust the pH of the solution with calcium oxide to be 7.16; the moisture content in the solution is measured as 53.2%; after the solution is cooled to room temperature, add 190 g of the methanol component and 10 g of methanol obtained from the rectification in Example 1, seal and let it stand for 4 hours before filtering, and the filtered product is dried in an oven at 90 ° C until it reaches a constant weight and then packed into a bag , to obtain EDTA calcium sodium salt product; then the filtrate...

Embodiment 3

[0032] Add 150 g of the aqueous solution obtained from distillation in Example 2 and 60 g of the desalted water mixture into the beaker, put it into an electric heating mantle and heat it to 85° C.; stir with a magnetic rotor, and set the number of revolutions to 360 revolutions per minute; Add 30g of disodium EDTA to the mixed solution. After the solids in the solution are completely dissolved, slowly add 8g of calcium oxide, and react for 0.5 hours after all the materials are added, then adjust the pH of the solution to 6.91 with disodium EDTA; measure the water content in the solution 52.8%; after the solution was cooled to room temperature, 198 g of the methanol component and 5 g of methanol obtained from the rectification in Example 2 were added, sealed and left to stand for 5 hours before filtering, and the filtered product was dried in an oven at 90° C. to a constant weight before loading bag to obtain EDTA calcium sodium salt product; then the filtrate was transferred t...

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PUM

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Abstract

The invention discloses a method for synthesizing EDTA (ethylene diamine tetraacetic acid) calcium sodium salt hydrate by low molecular alcohol precipitation at a low boiling point. The method mainlycomprises the following steps: adding EDTA disodium and calcium salt in hot desalinized water; and adding alcohol, standing and filtering to obtain the EDTA calcium sodium salt product. The EDTA calcium sodium salt hydrate is prepared by the method, a high-temperature and high-pressure process does not exist, required equipment and process are simple, and the investment risk is small. Compared with a traditional process, the process has the advantages that a concentrate process does not exist, and effects of energy conservation and emission reduction are obvious. The product is obtained by a liberation method, and thus, the product is uniform in granularity and excellent in quality. Meanwhile, alcohol which is rectified and recycled in the method can serve as recycled alcohol and is used as a precipitation agent for an experiment in next time, remaining water is used as a solvent for the experiment in next time, wastes are not discharged in a whole technological process, and the benefit of environmental protection is high.

Description

technical field [0001] The invention relates to the field of organic chemical synthesis, in particular to a process method for synthesizing EDTA calcium sodium salt by a low boiling point and low molecular weight alcohol analysis method. Background technique [0002] EDTA calcium sodium salt is a very commonly used food additive. At the same time, calcium is one of the essential weight elements for plants. In chemical fertilizers, EDTA calcium sodium salt can effectively prevent calcium ions from forming water-insoluble substances with phosphate and sulfate ions. It can be used in the production of high-end fertilizers such as fully water-soluble fertilizers and liquid fertilizers. , has good economic and practical value. [0003] The third issue of Volume 5 of the Journal of Shandong Institute of Light Industry announced a preparation process route of calcium sodium salt of ethylenediaminetetraacetic acid. Calcium sodium diamine tetraacetate, the method has the advantages...

Claims

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Application Information

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IPC IPC(8): C07C227/18C07C229/16
CPCC07C227/18C07C229/16Y02P20/10
Inventor 廖廷君赵永清李勇兰鹏朱德林戴志谦汪国瑜余永德唐汇
Owner SICHUAN LUTIANHUA
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