Method for producing edible grade EDTA disodium

A food-grade, sodium carbonate technology, applied in applications, food preparation, food science, etc., can solve the problems of not meeting the requirements of food grade, high requirements for reaction conditions, and high requirements for three-waste treatment, achieving high temperature and low risk factor , The effect of small investment in equipment

Inactive Publication Date: 2005-01-12
广州市微生物研究所
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AI Technical Summary

Problems solved by technology

[0004] At present, the production methods of ethylenediaminetetraacetic acid commonly used in China include the chloroacetic acid method and the sodium cyanide method. The chloroacetic acid method requires a large investment in equipment and high requirements for reaction conditions. The conversion rate of ethylenediamine is about 90%, and the yield is low. And unstable; the sodium cyanide method involves highly toxic substances, the risk factor is high, and the requirements for the treatment of three wastes are high, which cannot meet the requirements of food grade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Main equipment name of the present invention:

[0023] (1) 1000L reaction tank (Guangdong Zhaoqing Container Factory)

[0024] (2) 100L feeding tank (self-installation)

[0025] (3) Buffer tank (self-installation)

[0026] (4) Hot air circulation oven: CT-C-II (Jiangsu Fanqun Drying Equipment Factory)

[0027] (5) Steam Boiler (Star Boiler Co., Ltd.)

[0028] (6) ZSP320 crushing vibrating screen pulverizer

[0029] In terms of energy, steam heating is used. The method steps are as follows:

[0030] (1) First add 220 kilograms of chloroacetic acid in a 1000-liter reaction tank, then add 135 kilograms of sodium carbonate, seal the cover, open the exhaust valve, adjust the valve according to the size of the exhaust sound, and slowly adjust the volume to 500 liters with purified water;

[0031] (2) Inhale 34 kg of ethylenediamine, turn on the cooling water, half open the feeding valve, slowly add 260 kg of 40% sodium hydroxide solution, stir intermittently, use the co...

Embodiment 2

[0036] Adopted main equipment and heating method are as embodiment 1, and method steps are as follows:

[0037] (1) First add 200 kilograms of chloroacetic acid in a 1000-liter reaction tank, then add 120 kilograms of sodium carbonate, seal the cover, open the exhaust valve, adjust the valve according to the size of the exhaust sound, and slowly adjust the volume to 500 liters with purified water;

[0038] (2) Inhale 31.5 kg of ethylenediamine, turn on the cooling water, half open the feeding valve, slowly add 177.8 kg of 45% sodium hydroxide solution, stir intermittently, use the cooling water and heating system to control the temperature at 40°C, and react for 3 hours , raise the temperature to 60°C, and react for another 3 hours;

[0039] (3) the reacted feed liquid is adjusted to PH=2 with 100 kilograms of concentrated hydrochloric acid, and the precipitate is separated by centrifugation;

[0040] (4) Neutralize the resulting solution with sodium hydroxide solution to mak...

Embodiment 3

[0043] Adopted main equipment and heating method are as embodiment 1, and method steps are as follows:

[0044] (1) First add 200 kilograms of chloroacetic acid in a 1000-liter reaction tank, then add 124 kilograms of sodium carbonate, seal the cover, open the exhaust valve, adjust the valve according to the size of the exhaust sound, and slowly adjust the volume to 500 liters with purified water;

[0045] (2) Inhale 30.8 kg of ethylenediamine, turn on the cooling water, half open the feeding valve, slowly add 285.7 kg of 35% sodium hydroxide solution, stir intermittently, use the cooling water and heating system to control the temperature at 70°C, and react for 5 hours , raise the temperature to 90°C, and react for another 4 hours;

[0046] (3) the reacted feed liquid is adjusted to PH=2 with 120 kilograms of concentrated sulfuric acid, and the precipitate is centrifuged;

[0047] (4) Neutralize the resulting solution with sodium hydroxide solution to make PH=6 to obtain slu...

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Abstract

A method for producing edible EDTA-2Na includes neutralizing reaction between chloroacetic acid and sodium carbonate, condensing reaction on ethyldiamine, using acid to regulate acidity to obtain EDTA, and reaction on sodium hydroxide to obtain EDTA-2Na.

Description

technical field [0001] The invention relates to a food grade disodium EDTA, in particular to a method for producing food grade disodium EDTA. Background technique [0002] Disodium EDTA, first discovered in Germany, is an excellent chelating agent that can strongly chelate metal ions in the aqueous phase. It is widely used in complexing agents, food additives, detergents, stabilizers, fiber processing aids, cosmetic additives, blood anticoagulants, bleaching and fixing solutions for color photosensitive materials, dyeing aids, synthetic rubber polymerization initiation And heavy metal quantitative analysis reagents and so on. [0003] Disodium EDTA is mainly used in food processing to complex harmful metal ions to improve food quality and stability. Color additive, used in canned aquatic products to prevent the formation of "struvite" (sodium ammonium phosphate) glass crystals, and can be used in combination with acid-type preservatives such as pota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L5/41
Inventor 姚朔影夏枫耿李运南董加喜谢浩良李超能
Owner 广州市微生物研究所
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