2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTCA) CAS No.  37971-36-1

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2-Phosphonobutane -1,2,4-Tricarboxylic Acid
CAS No. 37971-36-1
Molecular Formula: C7H11O9P
Molecular weight: 270.13
Synonyms: Dequest 7000, PBTC, Phosphonobutane Tricarboxylic Acid
Structural Formula:


Items                                                               Index
Appearance                    Clear, colorless to pale yellow aqueous solution
Active acid %                                                 50.0-51.0
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)                                   1.5~2.0
Fe ppm                                                          10.0 max
Chloride ppm                                                 10.0 max
Turbidity (NTU)                                              10.0 max
Color APHA                                                    30.0 max


PTBCA is a high efficient agent as scale and corrosion inhibitor. It 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, copolymer, organophosphine, imidazole and other
Water Treatment Chemicals. When used alone, the dosage of 5-15mg/L is preferred.

Package and Storage:

200L plastic drum, IBC (1000L), customers’ requirement.
Storage for one year in shady room and dry place.

Safety Protection:

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