Preparation and application of supported demulsifier PPA@SiO ₂ for oil removal of oil-in-water emulsion

A novel silica-supported polyether polysiloxane quaternary ammonium demulsifier for highly efficient fine-sized oil droplet removal of oil-in-water emulsions

“…The preparation process was divided into three steps: mineralized water preparation, oil droplet mother liquor preparation and oil in water emulsions generation. 14 To prepare the mineralized water, 1.167 g NaCl, 2.443 g NaHCO 3 , 0.007 g Na 2 SO 4 , 0.060 g CaCl 2 , and 0.053 g MgCl 2 $6H 2 O were dissolved and diluted in deionized water to a nal volume of 1 L. To prepare the oil bead mother liquor, 0.1 g SDBS and 0.1 g PAM were dissolved and diluted with the simulated produced water to a nal volume of 1 L. Then, 100 mL of this solution was mixed with 100 g of crude oil and heated at 45 C for 1 h and emul-sied using a high-speed mixer at 2000 rpm for 15 min to produce a mother liquid with an oil concentration of 50 wt%. To obtain the simulated produced water, 0.15 g mother liquid was dosed into 500 mL mineralized water that contained 700 mg L À1 NaOH, 300 mg L À1 SDBS and 500 mg L À1 PAM.…”

“…For the reverse demulsication experiments, a bottle containing 40 mL simulated ASP produced water was placed into a water bath shaker at 50 C (the temperature of typically produced water from ASP ooding from Shengli Oileld ranged 40 to 50 C) for 30 min. 14 Varied dosages of PPQA@SiO 2 (0.6-1.6 g L À1 ) were added into the samples of simulated ASP produced water and the mixture was shaken thoroughly to ensure that PPQA@SiO 2 and the emulsions were evenly mixed. The oil removal tests were carried out at different times (30-80 min) and different temperatures (20-70 C) in a thermostat water bath.…”

“…Later, we demonstrated the adsorption of oil droplets from wastewater by hydrated silica (SiO 2 $2H 2 O) and a high absorption capacity was achieved due to the large specic surface area and porosity of silica. 14 From the above-mentioned ndings, the advantages of both a demulsier and adsorbent in the O/W demulsication process have been demonstrated. To further enhance the efficiency of the oil-water separation, we consolidated the functions of the demulsier and adsorbent and synthesized a novel silicasupported polyether polysiloxane quaternary ammonium (PPQA@SiO 2 ) reverse demulsier by graing the demulsier PPQA onto the surface of silica particles.…”

Preparation of a composite of polyacrylate and nano‐SiO2 particles and evaluation of its performance of oil–water mixture treatment

“…The NAPLs accumulated in water bodies form stable waterin-oil (W/O) and oil-in-water (O/W) emulsions following the migration process, and the emulsions treatment is more challenging than layered oil removal from water. 10 Nisar Ali et al 11 designed a raspberry-like magnetic composite demulsifier with strong interfacial activity. This material not only showed favorable interfacial activity at the oil-water interface but could also break crude oil-water emulsions entirely within 1 h at 60 C. In addition, the demulsifier recovered without complications due to its timely response to the external magnetic field.…”

Demulsification Treatment of Spent Metalworking Fluids by Metal Cations: The Synergistic Effect and Efficiency Evaluation

“…Specifically, (i) organic demulsification means that the water and oil are layered through adding specific organic demulsifiers (such as polymeric flocculant and surfactant [12]), however, the screening process of the demulsifier was so tedious that the efficiency was difficult to remain stable against the complex emulsified oil mixtures such as L-MWFs; (ii) the acidified demulsification [14] was accomplished by the neutralization of the diffused anionic emulsifier by protons discharged under acid conditions; nevertheless, the demulsification efficiency was relatively poor, and the pH environment was seriously corrosive to the equipment in extreme cases; (iii) the inorganic demulsification mainly carried out by the electrolytes (such as ferrous chloride, calcium chloride, polymeric aluminium and polyferric chloride, etc., [19] as well as the reinforced, oriented, additional and inorganic flocculant), similarly to the organic demulsification, had a functional metal ion screening process that was complex, which led to less reports on the inorganic demulsification screening for L-MWFs. Furthermore, the synergistic demulsification of organic demulsification and inorganic demulsification, or the combined demulsification of metal cation was proved as a promising way to improve the removal rate of oil pollutants and COD Cr [20]. Unfortunately, the synergistic effect of bi-metal salt demulsification on L-MWFs demulsification with high pollutant content and complex ingredients was rare at present.…”