PBTCA, 2-PHOSPHONO-1,2,4-BUTANTRICARBOXYLATE, 50%, L

Parameter	Attribute
PBTC	2-Phosphono-1,2,4-butantrikarboxylate, PBTCA
Formula	C7H11O9P
Structure
IUPAC	2-Phosphono-1,2,4-butanetricarboxylic acid
INCI	-
CAS	37971-36-1
Molar mass	270.13 g/mol
Density	1,285 g/cm3 (20 °C)
Solubility	Miscible

PBTCA has excellent chelating properties and is more effective at inhibiting sedimentation (deposition) on membranes than polyphosphates. Highly effective at inhibiting sedimentation in aqueous systems. PBTC is used as a stabilizer for sodium hypochlorite. Stable at both high pH and high electrolyte concentrations and at high temperatures.

In the cleaning industry, PBTC is used as a stabilizer in various types of chlorine-based bleaches and detergents.

In the heating industry, PBTC is used as a metal ion binder in heating or refrigeration systems to prevent the formation of lime deposits, both calcium carbonate and calcium sulphate. The recommended application rates are 5-15 mg/L.

In swimming pools, PBTC is used not only as a lime scale inhibitor but mainly as an active chlorine stabilizer. PBTC allows the hypochlorite to remain stable for a longer period of time, resulting in a lower chlorine odor in the pool and a lower dosage of sodium hypochlorite is required to maintain an adequate chlorine level in the pool.

In the weaving industry and fabric dyeing, PBTC is used as an additive to dye baths to bind metal ions (sequestrant), allow better penetration of the dye into the fabric, and keep the color intact.

In water treatment, phosphonate butane tricarboxylate is used in the production of distilled water by reverse osmosis as a lime inhibitor. PBTC binds calcium and magnesium ions and prevents the formation of calcium sulphate, thus keeping the membrane free of blockages and eliminating the need for additional cleaning or washing. PBTC is often found in membrane cleaners. The advantage of use is that the compound is non-toxic.

In construction, PBTC is used as a concrete admixture and superplasticizer. PBTC slows down the passage of water to the calcium, thus allowing the concrete to set longer. It also makes the concrete more fluid and less porous, leading to greater strength and structural integrity.

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