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Production process of ethylene diamine tetraacetic acid and its salt with hydrocyanic acid synthesis gas as raw material

A technology of ethylenediaminetetraacetic acid and synthesis gas, applied in chemical instruments and methods, preparation of organic compounds, preparation of cyanide reaction, etc., can solve the problems of low yield, high cost, environmental pollution, etc. The effect of increasing the rate, stable product quality, and reducing production costs

Inactive Publication Date: 2003-01-01
四川省天然气化工研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield is low, the cost is high, and the environment is polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 0.2mol ethylenediamine, 140ml water, and 100ml dropping funnel to a 500ml glass three-neck flask with stirring, add 31ml formaldehyde for feeding, cool with ice water, and react to form aldehyde-amine mixture. The 20% (V / V) hydrocyanic acid gas is introduced with a glass tube, and the rotameter measures the hydrocyanic acid gas participating in the reaction. The reaction temperature is 25°C, the pH is 3, and ethylenediaminediacetonitrile solution is obtained; at the same time, 40ml of formaldehyde and hydrogen cyanide gas are fed in, the reaction temperature is 60°C, the pH is 5, and 43g of ethylenediaminetetraacetonitrile is obtained.

[0030] Ethylenediaminetetraacetonitrile 43g with 55% H 2 SO was hydrolyzed to obtain 58.1 g of ethylenediaminetetraacetic acid, with a content of 98.5%, and a yield of 97.8% based on ethylenediamine.

[0031] During the reaction, the stirring speed was 500 rpm.

Embodiment 2

[0033] In a 2000L reactor, add 115kg of ethylenediamine and 1000L of water, add 280L of formaldehyde (37%) under stirring, and stir after the addition is completed. The stirring speed is 500 rpm for about 30 minutes. Under the standard state, the concentration is 7% (V / V) hydrocyanic acid synthesis gas, and it is measured by an orifice flowmeter, and it is passed through about 1200m 3 , the reaction temperature is 25°C, the acidity pH is adjusted to 3, and the reaction solution is ethylenediamine diacetonitrile; then 310L of formaldehyde is added, and 1300m of hydrocyanic acid synthesis gas is introduced 3 , the reaction temperature was 60°C, the pH was 7, and 441 kg of ethylenediaminetetraacetonitrile was obtained.

[0034] In a 2000L reaction kettle, add 441kg of ethylenediaminetetraacetonitrile, add 800L of water, 830L of 30% sodium hydroxide solution, stir and raise the temperature, keep boiling at 102°C for about 1 hour, add activated carbon to the obtained reaction solut...

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PUM

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Abstract

The present invention is the production process of ethylene diamine tetraacetic acid and its salt with coarse synthetic hydrocyanic acid gas as material. The technological process includes the steps of: mixing and reacting formaldehyde and ethylene diamine inside a reactor to synthesize aldehyde-amine mixture liquid; introducing synthetic hydrocyanic acid gas and reacting with aldehyde-amine mixture to produce intermediate product ethylene diamine diethyl cyanamide; introducing formaldehyde, acid and synthetic hydrocyanic acid gas to produce ethylene diamine tetraethyl cyanamide simultaneously; hydrolyzing ethylene diamine tetraethyl cyanamide with acid or alkali aqueous solution to produce ethylene diamine tetraacetic salt; and adding acid to regulate pH to 1-5 to obtain ethylene diamine tetraacetic acid and its salt.

Description

Technical field: [0001] The invention relates to a method for producing ethylenediaminetetraacetic acid and its salts by using hydrogen cyanide synthesis crude gas as raw material. Background technique: [0002] Ethylenediaminetetraacetic acid (EDTA for short) is a white, tasteless, odorless crystalline powder. Melting point 240°C (decomposition), insoluble in water, ethanol and general organic solvents, easily soluble in sodium hydroxide, sodium carbonate and ammonia solution. Its alkali metal salts are soluble in water. EDTA and its salts include EDTA disodium salt, EDTA tetrasodium salt. Using them as raw materials, EDTA zinc salt, EDTA calcium salt, EDTA magnesium salt, EDTA copper salt, EDTA iron sodium salt and EDTA iron ammonium salt can also be produced. EDTA and its salts can form a powerful ligand with a variety of metal ions through its two nitrogen atoms and four carboxyl groups, and can undergo complex reactions with a variety of metal ions to form compounds ...

Claims

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Application Information

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IPC IPC(8): C07C227/12C07C229/16
Inventor 方善伦黄践易孟生程祖生张杰吴尘
Owner 四川省天然气化工研究院
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