CAS 37971-36-1 corresponds to 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), an organic phosphonocarboxylic acid-based water treatment scale inhibitor and corrosion inhibitor resistant to high temperatures, oxidation, and chlorine.

Core Basic Information
- Chinese Name: 2-Phosphonic Butane-1,2,4-Tricarboxylic Acid
- English name: 2-Phosphonobutane-1,2,4-tricarboxylic acid
Common aliases: PBTCA, PBTC
- Molecular formula: C₇H₁₁O₉P
- Molecular weight: 270.13
- CAS Registry Number: 37971-36-1
- EINECS No.: 253-733-5

Physical and chemical properties
Appearance: Colorless or light yellow transparent liquid (common industrial product: 45%~50% aqueous solution)
- Density: ≥1.270 g/cm³ (at 20°C)
- Solubility: Miscible with water, ethanol, and acetone
- Stability: Resistant to acids, alkalis, and oxidation; remains non-hydrolyzed at pH >14 with excellent thermal stability; freezing point approximately -15°C

Key Features and Applications
Scale inhibition and corrosion inhibition: It can achieve a calcium carbonate scale inhibition rate of up to 98%, effectively suppressing scale formation within a pH range of 7.0–9.5 while also providing corrosion protection for metal surfaces.
2. Chelation capability: Strongly complexes ions such as Ca²⁺, Zn²⁺, and Mg²⁺, serving as an excellent stabilizer for zinc salts and enabling the concentration factor of circulating water to exceed 7.
3. Applicable Scenarios: Widely used in circulating cooling water systems, oilfield water injection, industrial boilers, food container cleaning, and uranium-containing wastewater treatment.
4. Synergistic Advantage: Often used in combination with zinc salts, copolymers, azoles, etc., with a typical standalone dosage of 5–15 mg/L.

Safety and Storage
- Toxicity: The oral LD₅₀ of a 50% aqueous solution in rats is >6500 mg/kg (low toxicity).
- Protection: Acidic and irritating; avoid contact with skin/eyes; rinse thoroughly with plenty of water in case of accidental contact.
Storage: Store in a sealed, cool place, protect from freezing and high temperatures, with a shelf life of typically 12 months.

Products :

PBTCA 50% CAS 37971-36-1 (2-phosphonobutane-1,2,4-tricarboxylic acid)
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