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


Synonyms: 2-Phosphonobutane-1,2,4-Tricarboxylic Acid, PBTC, PBTCA; Dequest 7000
CAS No.: 37971-36-1
EC No.: 253-733-5
Molecular Weight: 270.1
Molecular Formula: C7H11O9P
Structural Formula: 2-Phosphonobutane-1,2,4-Tricarboxylic Acid (PBTC)


PBTC can be obtained by reaction between maleic anhydride, methanol, and phosphorus trichloride.


PBTC is used as scale inhibitor, deflocculant, sequestrant, and water stabilizer in boiler, pipeline, and detergent etc. Under condition of high temperature, high pH value and high hardness, PBTC performs very well. Dosage is usually 5 to 15 mg/L, normally applied with other phosphonates, polymers. Working pH is 7.0 to 9.5


Items Specification
Appearance clear pale yellow liquid
Active Content 50±1%
Phosphoric Acid (as PO4) 0.2% max.
Chlorides (as Cl) 10 ppm max.
Iron (as Fe) 5ppm max.
pH Value (1% aqueous) 1.5-2.0
Color, APHA 80 max.
Density( 20°C),g/cm3 1.27~1.30
Viscosity (20°C, mpa.s) 15~25

Standard Packaging

250kgs net/200L plastic drums; 1250kgs net/IBC; ISO Tank
Expiry: 12 months

200L drums for PBTC

Risks and Safety Information

PBTC is regulated by UN as hazardous substance.
Danger! Corrosive Liquid, Organic, N.O.S.
UN 3265, Class 8, PG III
For more information, please see MSDS

Warning, Corrosive Liquid

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