1.Product name:2-Phosphonobutane -1,2,4-Tricarboxylic Acid(PBTCA) 2.CAS No.:37971-36-1 3.Appearance:Colorless liquid ... Product name:2-Phosphonobutane -1,2,4-Tricarboxylic Acid(PBTCA) Uses: It is widely used in circulating cool water system ... fields, it is used as chelating agent and metal detergent.PBTCA is usually used together with zinc salt, copolymer, organophosphine, imidazole ...