Catalytic oxidation of polymer used in oilfield by supported Co(II) complex within a high pH range

In this study, a clean oxidation process for the treatment of wastewater containing hydroxypropyl guar gum (HPGG) and other polymers under high pH range was designed. For that, 5-sulfosalicylic acid (L)-Co(II) complex supported on bentonite (B) (B@Co(II)L) prepared by hydrogen peroxide (H 2 O ). The morphology pore structure B@Co(II)L first characterized scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), N adsorption–desorption isotherms, after which catalytic performance investigated polymer wastewater. Results show that performed in wide 7.0 to 13.0. viscosity HPGG can be decreased effectively from 22 2.5 mm /s optimal conditions 45 °C, 10.0, 10% H (mass ratio HPGG), ), removal rate chemical oxygen demand (COD) HPGG, CMC, PAM reached 95.9%, 94.8%, 93.7%, respectively, within 240 min. Most all, applying catalyst oilfield, it found has COD oilfield wastewater, fracturing fluids, drilling fluid achieved 92.1%, 94.2%, 90.7%, respectively.