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
     
                    

                           
            

     
      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.

Alternative Name / Synonyms
       
            

            
1. PBTCA            
2. phosphonobutane tricarboxylic acid            
3. 2-Phosphonobutane -1,2,4-Tricarboxylic Acid