Ethylene Diamine Tetra(Methylene Phosphonic Acid) EDTMPS
Aliases: Ethylenediamine tetramethylene phosphonate sodium, Ethylenediamine tetramethylenephosphonate sodium
Molecular formula C6H15O12N2P4Na5
Relative molecular mass: 546.03
Structural formula
Ⅰ. Performance and use
EDTMPS is a nitrogenous organic polyphosphonic acid, which is a cathodic corrosion inhibitor. Miscible with water, non-toxic and pollution-free, good chemical stability and temperature resistance, at 200℃ still has a good scale inhibition effect. EDTMPS can dissociate into 8 positive and negative ions in aqueous solution, so it can chelate with multiple metal ions to form multiple monomeric macromolecular reticular complexes, which are loosely dispersed in water and destroy the normal crystals of calcium scale. EDTMPS has good scale inhibition effect on calcium sulfate and barium sulfate scale.
EDTMPS is used as corrosion inhibitor and scale inhibitor for circulating water and boiler water, as a cyanide-free complexing agent for electroplating, as a chelating agent for textile and dyeing industry and as an oxygen bleaching stabilizer.
Ⅱ. Technical indicators
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Item
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Indicators
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Appearance
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Amber transparent liquid
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Active component (EDTMPS)/%
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24.0～26.0
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Active component (EDTMPS)/%
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30.0～32.6
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Chloride (Cl-)
%
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≤2.0
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pH(Concentrate)
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6.0～8.0
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Density（20℃）/g·cm-3
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≥1.25
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Fe content(Fe) /mg·L-1
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≤10.0
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Ⅲ. Method of use
In the circulating cooling water for additional hours, the general dose is 2 ~ 10mg/L. After mixing EDTMPS and HPMA in proportion of 1:3, it can be used for water treatment in low pressure boiler. EDTMPS can also be used in combination with BTA, PAAS, zinc salts, etc.
Ⅳ. Packaging and storage
EDTMPS is packaged in plastic drums of 25kg each or as per user's requirements. Store in indoor shade for 6 months.
Ⅴ. Safety protection
EDTMPS is neutral, pay attention to labor protection when operating, should avoid contact with the skin, eyes, etc., after contact should be immediately washed with plenty of water.
