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2-Phosphonobutane -1,2,4-Tricarboxylic Acid

2-Phosphonobutane -1,2,4-Tricarboxylic Acid

2-Phosphonobutane-1,2,4-tricarboxylic acid

    CAS No.  37971-36-1 

    Molecular Formula:   C7H11O9P

    Molecular weight: 270.13

    Structural Formula:


    PBTC;PBTCA;PHOSPHONOBUTANE TRICARBOXYLIC ACID;2-Phosphonobutane -1,2,4-Tricarboxylic Acid


    PBTCA has low content of phosphoric, has structural features of both phosphoric acid and carboxylic acid group, which enable its excellent scale and corrosion inhibition properties. Its antiscale property under high temperature is far better than that of organophosphines. It can improve zinc salt solubility, has good chlorine oxidation tolerance and good composite synergy. 





    Clear, colorless to light yellow aqueous solution

    Active acid %

    50.0 min

    Phosphorous acid(as PO33-)%

    0.5 max

    Phosphoric acid(as PO43-)%

    0.2 max

    Density (20℃) g/cm3

    1.27 min

    pH(1% water solution)



    PBTCA is a high efficient agent as scale and corrosion inhibitor. PBTCA is the excellent stabilizer for zinc salt. It is widely used in circulating cool water system and oilfield refill water system as scale and corrosion inhibitor, suitable to composite with zinc salt and copolymer. PBTCA can be used in situations of high temperature, high hardness, high alkali and high concentration index. In lavation fields, it is used as chelating agent and metal detergent. 

    PBTCA is usually used together with zinc salt, tetrasodium iminodisuccinate, copolymer, organophosphine, imidazole and other Water Treatment Chemicals. When used alone, the dosage of 5-15mg/L is preferred.

    Safety Protection:

    Acidity, Avoid contact with eye and skin, once contacted, flush with water.