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Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents
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2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTC)

CAS No. 37971-36-1 EINECS No. 253-733-5
Molecular Formula C7H11O9P Molecular Weight 270.13
Structural Formula

PBTC Structural Formula

Product Features

PBTC has low content of phosphoric, its structure contains both phosphonic acid and carboxylic acid group. PBTC is designed to control calcium scale formation and precipitation in highly stressed alkaline industrial water treatment and boiler systems. The anti-scaleproperty of PBTC under high temperature is far better than that of organophosphines. PBTC is chlorine stable, it can also be used for scale control in applications using halogen-based biocides or hypochlorite bleachares. PBTC has good chelating ability for heavy metals, and can eliminates the remobilization of heavy metals from sediments. Besides, PBTC can improve zinc saltsolubility and has good composite synergy.

Technical Specification

Parameter Standard
Appearance Clear, colorless to pale yellow aqueous solution
Active content, % 50.0 min
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

Applications & Usage

PBTC is widely used in circulating cooling water systems and oilfield supply water systems.

PBTC can be used as a high efficient scale and corrosion inhibitor in situations of high temperature, high hardness, high alkali and high concentration index. In lavation fields, PBTC is used as chelating agent and metal detergent.

PBTC 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.

Scale & Corrosion Inhibition Performance

CaCO3 inhibition CaSO4 inhibition CaF2 inhibition Iron control Sequestration
Excellent Poor Excellent Yes Good
Steel corrosion inhibition Calcium Tolerance
Good Very Good

Package & Storage

HEDP Liquid
25L Drum 200L Drum 1000L IBC ISO Tank
Storage for 10 months in shady room and dry place.

Hazard & Safety Precaution

Hazard Information Safety Precaution

Corrosive, Class 8, UN 3265

Once contacted with eye and skin, flush with plenty of clean water.

Alternative Name / Synonyms

  1. PBTC;
  2. PBTCA;
  4. 2-Phosphonobutane -1,2,4-Tricarboxylic Acid;
  5. 2-Phosphonobutane-1,2,4-tricarboxylic acid PBTC;