Synthesis Of Double-Hydrophilic Antiscalant And Evaluation Of Its Caco3 ' Caso4 And Ca-3(Po4)(2) Precipitation Performance

A non-phosphorus copolymer, acrylic acid-isoprenyl polyethoxy carboxylate copolymer (AA-TPEL) is synthesized and employed as a multifunctional scale inhibitor for calcium carbonate, calcium sulfate and calcium phosphate deposits. The molecular structure of TPEL and AA-TPEL is characterized by Fourier transform infrared spectroscopy and (1)hydrogen nuclear magnetic resonance spectroscopy. Scanning electron microscopy (SEM) and X-ray powder diffraction are used to characterize the surface morphology and crystal form of calcium scales. Compared with several current commercial inhibitors, AA-TPEL exhibits excellent ability to control calcium precipitation, with approximately 88.67% CaCO3 inhibition and 97.07% CaSO4 inhibition at levels of 8 and 3 mg L-1, respectively. It also maintain superior ability to prevent the formation of Ca-3(PO4)(2) scale with 98.92% inhibition efficiency at the low level of 4 mg L-1. The inhibitory behavior of the polymer is determined by using static scale inhibition method.