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Process for the preparation of iminodiacetic acid

A technology of iminodiacetic acid and iminodiacetic acid disodium salt, which is applied in the field of preparation of iminodiacetic acid, can solve the problems of high acid and alkali consumption, low conversion rate, serious problems, etc., and achieves high efficiency, simple reaction process and easy operation convenient effect

Active Publication Date: 2017-07-18
JIANGYIN ANCAN ELECTROCHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for synthesizing iminodiacetic acid at home and abroad, but the final process is to obtain iminodiacetic acid by acidifying the sodium salt of iminodiacetic acid. The method of adding acid and acidifying will consume a large amount of acid and alkali, and at the same time, a large amount of sodium will be produced by-product. Salt, due to solubility reasons, the mother liquor still contains about 60g / L dissolved iminodiacetic acid, this method not only produces a large amount of waste liquid, brings serious environmental problems, but also has a low conversion rate and cannot achieve complete conversion

Method used

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  • Process for the preparation of iminodiacetic acid

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Embodiment 1

[0048] The concentration of iminodiacetic acid disodium salt is 5%, the temperature is 50°C, and the current density of S1 and S2 is 100 A / m 2 , The electrode spacing is 1.5cm, the cathode chamber and the intermediate chamber adopt sodium ion exchange membrane, the anolyte is 5% sulfuric acid, the anode DSA oxygen evolution electrode, the catholyte is 5% sodium hydroxide, and the cathode is a nickel-based active cathode. The flow rate was 0 mm / s, the solution was cycled and electrolyzed to pH 2, and the current efficiency was 97%.

Embodiment 2

[0050] The concentration of iminodiacetic acid disodium salt is 50%, the temperature is 90°C, and the current density of S1 and S2 is 1000 A / m 2 , The electrode spacing is 1.5 cm, the cathode chamber and the intermediate chamber adopt sodium ion exchange membrane, the anolyte is 5% sulfuric acid, the anode DSA oxygen evolution electrode, the catholyte is 5% sodium hydroxide, and the cathode is a nickel-based active cathode. The flow rate was 200 mm / s, the solution was electrolyzed in circulation until the pH was 0.1, and the current efficiency was 96%.

Embodiment 3

[0052] Iminodiacetic acid disodium salt concentration 40%, temperature 80°C, S1 current density 3000 A / m 2 , S2 current density is 1000 A / m 2 , The electrode spacing is 1.5 cm, the cathode chamber and the intermediate chamber adopt sodium ion exchange membrane, the anolyte is 5% sulfuric acid, the anode DSA oxygen evolution electrode, the catholyte is 5% sodium hydroxide, and the cathode is a nickel-based active cathode. The flow rate was 2 mm / s, the solution was electrolyzed to pH 1, and the current efficiency was 93%.

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Abstract

The invention provides a method for preparing iminodiacetic acid, which is prepared by step-by-step electrolysis. Firstly, disodium iminodiacetic acid is electrolyzed to monosodium iminodiacetic acid, and then monosodium iminodiacetic acid is electrolyzed to monosodium iminodiacetic acid. Aminodiacetic acid, using the method of electrolysis, has the advantages of being environmentally friendly, the by-products produced during the electrolysis process have a wide range of uses, the electrolysis reaction process is simple, and the operation is convenient. When disodium aminodiacetic acid is electrolyzed to monosodium iminodiacetic acid, a larger current density can be used, so the efficiency is higher.

Description

technical field [0001] The invention relates to a method for preparing iminodiacetic acid, in particular to a method for preparing iminodiacetic acid by electrolysis. Background technique [0002] Iminodiacetic acid (salt) is an important intermediate in the production of broad-spectrum herbicide-glyphosate pesticide. Glyphosate is a non-selective, non-residual herbicide that kills perennial root weeds and is widely used in gum, mulberry, tea, orchards and sugarcane fields. [0003] At present, there are many methods for synthesizing iminodiacetic acid at home and abroad, but the final process is to obtain iminodiacetic acid by acidifying the sodium salt of iminodiacetic acid. The method of adding acid and acidifying will consume a large amount of acid and alkali, and at the same time, a large amount of sodium will be produced by-product. Salt, due to solubility reasons, still contains about 60g / L dissolved iminodiacetic acid in the mother liquor, this method not only produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/00
Inventor 徐文新唐建军陈晓丽马培岚浦臻虎高兴旺徐坚唐宏陈松
Owner JIANGYIN ANCAN ELECTROCHEM EQUIP