Preparation of novel green chelating agent glutamic diacetate tetracetic acid metal salt

A technology of tetrasodium glutamic acid and tetrasodium acetate, which is applied in the field of synthesis of tetrasodium glutamic acid diacetate, can solve the problems of high waste water treatment cost, poor product color, easy-to-corrosion equipment, etc., and achieve low cost and non-sticky products , easy-to-handle effects

Active Publication Date: 2012-12-19
石家庄杰克化工有限公司
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  • Abstract
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Problems solved by technology

[0004] Tetrasodium glutamic acid diacetate (GLDA-4Na) has emerged on the stage of chelating agents with its excellent performance. For example, the application of GLDA metal salts is given in the patent CN200880103236.0. At present, L-glutamic acid, Sodium cyanide and formaldehyde can also be used as raw materials to obtain products smoothly, but the process uses highly toxic HCN, and it is easy to corrode equipment, and the waste water produced contains a large amount of cyanide residues, and the cost of waste water treatment is high. At the same time, the product contains The content of NTA impurities is high, between 2.5-3.0%, and the color of the product is poor

Method used

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  • Preparation of novel green chelating agent glutamic diacetate tetracetic acid metal salt

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 100g of L-glutamic acid and 200g of water into the four-neck flask, stir to dissolve, then cool down to 30°C, add 102.7g of 2-chloroacetonitrile and 105.8 of pyridine within 0.5-2h; after the addition, stir at this temperature for 3h , obtain the aqueous solution of GLDN; Detect purity with HPLC and can reach more than 95% (mobile phase: methanol: water=15: 85); Add GLDN solution in the four-necked bottle, add 10g zinc chloride, reflux reaction 3h, then add 356g of 30% NaOH, to produce GLDA-4Na, after the addition, it is necessary to reflux and discharge ammonia for 2 hours; the obtained GLDA-4Na solution has a certain color, add activated carbon for decolorization for 3 hours, and concentrate to obtain 515g of GLDA-4Na with a concentration of 41% after removing the activated carbon. The rate is 90.02%.

Embodiment 2

[0030] Add 100g of L-glutamic acid and 300g of water into the four-necked flask, stir to dissolve, then cool down to 50°C, add 150.4g of 2-chloroacetonitrile and 195.7g of triethylamine to it in about 1.5h; after stirring for 5h, the product of GLDN is obtained. Aqueous solution; Detect purity with HPLC and can reach more than 96% (mobile phase: methanol: water=15: 85); The following hydrolysis, decolouring, concentration steps are the same as the second half of example 1; Finally obtaining 520g concentration is 40.58% GLDA- 4Na, yield 89.96%.

Embodiment 3

[0032] The part to obtain the GLDN solution is the same as the previous part of Example 2; add the GLDN solution to the four-necked bottle, add 50g of zinc chloride, and reflux for 3 hours, then add 434g of 30% NaOH to generate GLDA-4Na, and reflux and exhaust ammonia for 6 hours after the addition ; The obtained GLDA-4Na solution has a certain color, adding activated carbon for decolorization for 0.5h, and concentrating after removing the activated carbon to obtain 502g of GLDA-4Na with a concentration of 46.12%, and the yield is 98.70%.

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Abstract

The invention relates to a novel preparation of a green chelating agent glutamic diacetate tetracetic acid metal salt. The preparation comprises the steps of synthesizing GLDA-4Na tetrasodium glutamate diacetate (GLDA-4M) through L-glutamic acid, 2-chloroacetonitrile organic alkali, zinc chloride and sodium hydroxide; carrying out cyanation and hydrolysis of L-glutamic acid to obtain the aqueous solution of the GLDA-4Na; and then carrying out decolorizing and concentrating to obtain the product. According to the preparation, the 2-chloroacetonitrile organic alkali is adopted to replace the common HCN (hydrogen cyanide) in the prior art, so that the use of the extremely toxic substance is reduced, and the produced wastewater can be easily processed; and green chelating agent glutamic diacetate tetracetic acid metal salt has high yield, high purity, and low cost, and is simple in technology, and easy to realize post-treatment to the wastewater, and achieve industrial production.

Description

technical field [0001] The invention uses L-glutamic acid and 2-chloroacetonitrile as raw materials to synthesize tetrasodium glutamate diacetate (GLDA-4M), which belongs to the synthesis technology of new products. Background technique [0002] Strong chelating agent for certain metals, conforms to OECD biodegradability test, effectively cleans the quenched surface of metals, high-efficiency detergent composition, low corrosion to certain metals, high solubility in alkaline solution; is NTA, EDTA and other chelating agents Alternatives to mixtures. It has a wide range of uses in industrial washing, household washing, process descaling, etc. [0003] A unique advantage of this product is that it is biodegradable. Now widely used chelating agents such as NTA, EDTA, etc., due to their poor degradation performance in the natural environment and the residues are harmful to nature and human body, it is urgent to find new substitutes. [0004] Tetrasodium glutamic acid diacetat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/18C07C227/02
Inventor 彭艳丽卢冬梅李大铁程雪莲张德路秦建辉张艳章
Owner 石家庄杰克化工有限公司
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