CAS No. 37971-36-1 corresponds to 2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTCA for short), which is a kind of low - phosphorus corrosion
and scale inhibitor. The following is a detailed introduction
:
Molecular formula and structure: Its molecular formula is C7H11O9P,
and its relative molecular mass is 270.13. PBTCA has the structural
characteristics of phosphonic acid and carboxylic acid, which endow it
with good scale and corrosion inhibition properties.
Physical and chemical properties: It is a colorless
or light yellow transparent liquid. The active component content is
≥50.0%, the phosphorous acid content is ≤0.8%, the orthophosphoric acid
content is ≤0.5%, the density at 20℃ is ≥1.270 g/cm³, and the pH value
of 1% aqueous solution is 1.5 - 2.0.
Performance advantages: PBTCA contains a low amount
of phosphorus. It has better scale and corrosion inhibition properties
than common organophosphonic acids, especially at high temperatures. It
can improve the solubility of zinc ions, has good chlorine - resistant
oxidation properties, and good compounding synergy.
Scope of application: It is widely used in the
corrosion and scale inhibition of circulating cooling water systems and
oilfield water injection systems. It is especially suitable for
compounding with zinc salts and copolymers and can be used in high -
temperature, high - hardness, high - alkalinity occasions and those
requiring high - concentration - multiple operation. In the washing
industry, it can be used as a chelating agent and metal cleaning agent.
