2-Phosphonobutane -1 2 4-Tricarboxylic Acid (PBTCA, PBTC)
The first reaction for PBTC production is between dialkyl phosphite (usually dimethyl phosphate in China) and maleic acid dimethyl ester under basic catalyst. Tetraalkyl ester of phosphonosuccinic acid forms and immediately reacted with methyl acrylate. The following thereupon saponification yields PBTCA.
CAS No.: 37971-36-1
Molecular Formula: C7H11O9P
PBTC is excellent as both antiscalants and corrosion inhibitors. Because of its structural feature of carboxylic acid and phosphoric acid. It is stable and high effect in the condition of high hardness, temperature, pH value, and indexed matter concentration.
While usually building with other organophosphates, polymers, imidazoles, PBTCA also widely works together with zinc salts whose solubility it will increase. PBTC also have a higher tolerance to oxidation agents like chlorine or bromine in the system.
|Appearance||Colorless or light yellow transparent liquid|
|Active acid %||49.0-51.0|
|Phosphorous acid(as PO33-)%||0.8 max|
|Phosphoric acid (as PO43-)%||0.5 max|
|pH (1% water solution)||1.5~2.0|
|Fe ppm||20 max|
|Density (20℃) g/cm3||1.27 min|
As an excellent inhibitor to both scale and corrosion, PBTCA is applied in refilling system and circulated cooling system for oil fields, steel mills, and mines. It is a good stabilizer to zinc salt. Besides, 2-phosphonobutane -1 2 4-tricarboxylic acid is used to chelate metal ions in lavation and detergent industries as metal detergent. In pH 7-10, 5-15 mg/L is recommended if only PBTC.
Package and Storage:
200L drum, 1000L IBC tote.
Corrosive. IMO class 8, UN 3265.