2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTC•Na4)

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Cas No.: 40372-66-5
Molecular formula: C7H7O9P·Na4
Molecular weight: about 358
Structural Formula:

Other name: 
2-Phosphonobutane-1,2,4-tricarboxylic acid sodium salt
PBTC sodium salt
PBTC-4Na
1,2,4-Butanetricarboxylic acid,2-phosphono-,sodium salt
2,4-butanetricarboxylic acid,2-phosphono-sodiumsalt
2-Phosphonobutane-1,2,4-Tricarboxylic Acid,Sodium salt (PBTCA Na4)
PBTCNA4
sodium 1,2,4-butanetricarboxylic acid 2-phosphonate
PBTCA·Na4
2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTC•Na4)

3.Performance and usage
PBTCA·Na4 contains less phosphorus. It has better anti-scale and anti-corrosion ability than normal phosphorus acid chelating agent, expecially in high temperature. Meanwhile, it has good oxidation resistance to chlorine, has good synergy. PBTCA·Na4 is the most widely used material in the formulation of high-efficiency scale and corrosion inhibitors. It is one of the products with the best performance and is also an excellent stabilizer for zinc salts.
PBTCA·Na4 is widely used in recycling water system and oil field water injection system as scale inhibitor. It is very suitable to use with Zn salt and copolymer together, even in a high temperature, hard water, high PH situation. It also can be used as chelating agent and metal cleaning agent in cleaning industry.

1.Technical indicators

Item	Standard
Appearance	Colorless or light yellow liquid	White powder
Effective content(PBTCA)/%	≥30.0	≥64.0
Effective content(PBTC·Na4)/%	≥40.0	≥85.0
Phosphorus content(PO43-)/%	≥10.5	≥22.5
pH(1% solution)	9.5-10.5	4.0～6.0
Density(20℃)/g·cm-3	≥1.35	--
Fe content (Fe) /mg·L-1	--	≤20.0

2.Using method:
PBTCA·Na4 is usually used with Zn salt, copolymer, organic phosphorus products and azole related products and other water treatment chemicals.The dosage is 4-15mg/L if it is used alone.

3.Package and Storage:
Liquid: 25kg or 250kg plastic barrel;  
Powder: 25kg plastic bags lined with polyethylene bags
Packing also can be determined according to clients’ demand. 
Store in a cool and ventilated place indoors, storage period is 1 year.

4.Safety protection
PBTCA-Na4 is week acidic,pay attention to labor protection during operation. Avoid contact with skin, eyes, etc. After contact, rinse with plenty of water.