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-Phosphonobutane -1,2,4-Tricarboxylic Acid(PBTCA) CAS No. 37971-36-1 Other Name:PBTC Molecular Formula: C7H11O9P Molecular weight: 270.13 Structural Formula: Properties: PBTCA has low content of phosphoric, has structural features of both phosphoric acid and carboxylic acid group, which enable its excellent scale and corrosion inhibition properties. Its antiscale property under high temperature is far better than that of organophosphines. It can improve zinc salt solubility