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2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTC)

Mrs. liang September 16, 2026

2-Phosphonobutane-1,2,4-Tricarboxylic Acid (PBTC, also abbreviated as PBTCA) is a highly effective scale and corrosion inhibitor widely used in industrial water treatment. Its molecular structure combines both phosphonic acid and carboxylic acid groups, which gives it superior performance compared to traditional organophosphonates, particularly under harsh conditions.


Primary Applications

Industrial Water Treatment is the dominant application. PBTC is used in circulating cooling water systems, boiler water systems, and oilfield water injection systems to prevent the formation of scale (calcium carbonate, calcium phosphate) and corrosion. It performs exceptionally well in high-temperature, high-hardness, high-alkalinity, and high-pH environments, making it suitable for systems operating at high concentration ratios.


Key advantages in this field include:


Superior high-temperature scale inhibition compared to standard organophosphonates like HEDP or ATMP


Excellent zinc salt stabilization, keeping zinc soluble even at pH 9.5


Good chlorine oxidation tolerance, making it compatible with halogen-based biocides (chlorine, bleach, bromine)


Low phosphorus content, which is environmentally favorable compared to other phosphonates


Typical dosage when used alone is 5-15 mg/L, though it is most often compounded with zinc salts, copolymers, and azoles for synergistic effects.


Other Industrial Uses

Industrial & Household Cleaning: PBTC is used as a chelating agent and metal detergent in industrial cleaners, liquid dishwashing concentrates, and disinfectants. It helps sequester metal ions and prevents scale in cleaning formulations, especially in alkaline solutions.


Metal Surface Treatment: It serves as a corrosion inhibitor for steel in metal surface treatment processes.


Textile Auxiliaries: Used as a sequestering agent to control metal ions during textile processing.


Other Applications: It is also cited as a chemical intermediate in insecticides, dry-cleaning soaps, gas absorbents, rubber chemicals, and plasticizers, as well as a retardant in concrete.


Quality Supplier：

Shandong Kairui Chemistry Co.,Ltd.

Zaozhuang Kairui Water Treatment Co., Ltd.


Key Practical Notes

Form: Usually supplied as a 50% aqueous solution, appearing as a colorless to pale yellow liquid.


Stability: Stable under high temperatures (up to 120°C), resistant to acids, alkalis, and oxidants, and does not hydrolyze even at pH > 14.


Toxicity: Low acute toxicity (oral LD50 > 6500 mg/kg in rats), but it is an acidic substance and can cause eye and skin irritation.


Environmental: Not readily biodegradable, though it does not bioaccumulate.


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