Ethylene Diamine Tetra | CAS:1429-50-1 (Methylene Phosphonic Acid) Sodium (EDTMPS)
CAS No. 1429-50-1
Molecular Formula: C6H12O12N2P4Na8
Molecular weight: 612.13
EDTMPS is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor. Its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. It can be fully dissolved in water, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. It shows excellent scale inhibition ability under temperature 200℃. It can dissociate into 8 positive-negative ions, thus can chelate with many metal ions to form polymer reticulation complex, to destroy the normal crystallization of calcium scale. EDTMPS shows better antiscale effects to calcium sulfate and barium sulfate.
Miscible with water. It has better scale inhibition effect below 200°C. It has better scale inhibition effect on calcium carbonate, and has good dispersibility and corrosion inhibition performance, and good thermal stability. Quality Standard Appearance Yellow-brown transparent liquid Active component (in EDTMPS) Content 28-30 Organic phosphine (in PO3-4) Content ≥8.4 Phosphorous acid (in PO3-3) Content ≤5.0 Phosphoric acid (in PO3-4) Content ≤2.0 Chloride (calculated by cl-) Content ≤6.0 Density (20°C) g/cm3≥1.30 Residual ethylenediamine content ≤0.80PH (1 aqueous solution) 9.5-10.5
Corrosion and scale inhibitor for circulating cooling water and boiler water, complexing agent for non-cyanide electroplating, water softener for printing and dyeing industry. Storage: 25kg or 200kg plastic drum, storage period is one year.
Production methods and others
Preparation method of ethylenediaminetetramethylene phosphoric acid (1429-50-1):
There are three synthesis methods.
1. The nucleophilic addition of formaldehyde and ethylenediamine generates methylolamine, which is then esterified with the hydrolyzate of Pal'.
2. Using ethylene glycol as an intermediate medium, ethylene glycol reacts with carbon dichloride to generate chlorinated phosphate, and then reacts with ethylenediamine and formaldehyde to generate EDTMP.
3. EDTA, PCl3, synthetic method.
The first two methods have few by-products, high yield and good product purity. But the cost is high and the raw materials are more expensive. At present, (1) method is still the main method in China. First, add a stoichiometric amount of ethylenediamine into the reaction kettle and add an appropriate amount of water to dissolve it. Stir well. Then, under cooling, phosphorus trichloride was added dropwise. The reaction temperature is preferably 40-60°C. After dripping, the temperature was raised to 60°C, and the aqueous formaldehyde solution was added dropwise. After dripping, the temperature is raised to 100~120℃, and the reaction is about 5h. Cool, blow out the remaining hydrogen chloride with air. Add sodium phosphate aqueous solution to adjust the pH to 9.5~10.5. The output is the finished product.
|Appearance||Clear yellow to umber transparent liquid|
|Active component (EDTMPS)%||28.0min|
|Organic phosphonic acid (asPO43- )%||10.0min|
|Phosphorous acid (as PO33-)%||5.0max|
|Phosphoric acid (asPO43- )%||1.0max|
|pH (1% water solution)||9.5-10.5|
|Density (20℃) g/cm3||1.25min|
|Chloride (Cl-) %||3.0max|
EDTMPS can be used as corrosion inhibitor in circulating cool water system and boiler water. It is a chelating agent in non-cyanogen electroplating industry and a water-softening agent in printing & dyeing industry. When used alone, 2~10mg / L is preferred. When built with HPMA by ratio ETDMP: HPMA=1:3, it can be used for low pressure boiler. It can also be built with BTA, PAAS and zinc salt.
Package and Storage:
200L plastic drum,IBC(1000L), customers' requirement. Storage for ten months in shady room and dry place.