Water Treatment Chemicals
Home >> Water Treatment Chemicals >> Organophosphoric Salts

2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTCA•Na4)

CAS No.  40372-66-5

Molecular Formula: C7H7O9P•Na4            Molecular weight: 358

Structural Formula:

2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTCA•Na4)


PBTCA•Na4 has low content of phosphoric, its structure contains both phosphonic acid and carboxylic acid group, which enable its good scale and corrosion inhibition properties. Its scale inhibition property under high temperature is far better than that of organophosph-ines. PBTCA•Na4 can improve the solubility of zinc salt, has good chlorine oxidation tolerance and good composite synergy. The solid state is easy deliquescence.


Items Index
Appearance Colorless to yellowish transparent liquid White crystal powder
Active content (as PBTCA, % ) 30.0 min 64.0 min
Active content (as PBTC•Na4, %) 40.0 min 85.0 min
Total phosphoric acid(PO43-%, ) 10.5 min 22.5 min
Fe, mg/L - 20.0 max
Density (20℃) g/cm3 1.35 min -
PH (1% water solution) 9.0-12.0 4.0-6.0


PBTCA•Na4 is the widely used and high effective agent as composite scale and corrosion inhibitor, it is also the excellent stabilizer for zinc salt. PBTCA•Na4 is used as scale and corrosion inhibitor in circulating cool water system and oilfield refill water system, especially used together with zinc salt and copolymer. PBTCA•Na4 can be used in situations of high temperature, high hardness, high alkaline and high concentration index, PBTCA•Na4 is used as chelating agent and metal detergent in lavation fields.

PBTCA•Na4 is usually used together with zinc salt, copolymer, organophosphine, imidazole and other Water Treatment Chemicals.

Package and Storage:

25kg/bag,customers’ requirement. Storage for one year in shady room and dry place.

Related Products:   2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt PBTCA•Na4
                                     2-Phosphonobutane -1,2,4-Tricarboxylic Acid PBTCA
                                     2-Hydroxyphosphonocarboxylic Acid HPAA