| At present, most oilfields in eastern China have entered in the period of high moisture content. Using EOR technology in the oilfield has brought considerable economic benefits, but also the composition of oily wastewater and stability of great changes have taken place. Single wastewater conventional treatment reagent and sewage treatment method have been hard work. So, research and development of new, highly efficient, complex wastewater treatment reagent has become a hot work to scientific research workers. In this paper, based on the research of the optimum reaction conditions of magnetic nano-meter Fe3O4 and PAMAM dendrimers, we utilize the special structure of PAMAM dendrimers coated magnetic nanometer Fe3O4 particle to be the PF series of magnetic nano-material modified dendrimer wastewater treatment reagent.This subject explore the best conditions of synthesis the Fe3O4 powder modified by sodium citrate through the orthogonal experiment on the basis of the synthesis of magnetic Fe3O4 powder: stirring speed 800 r/min, n (Fe2+)/n(Fe3+)/n(OH-) = 1/1.8/8, the concentration of ammonia is 0.25 mol/L, iron salt concentrations is 0.75 mol/L, the reaction temperature is 50℃, n(Sodium Citrate)/n(Total Fe) = 0.75. And through infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and dynamic scattering particle size instrument to analysis, the product is proved to be the magnetic Fe3O4 around 20 nm in diameter.PAMAM dendrimers have been synthesized by divergent method, and the most optimum conditions have been detailedly studied on synthesis of low-generation PAMAM dendrimers. The optimum reaction conditions of synthesis 0.5 PAMAM dendrimers: reaction time 18h, reaction temperature 30℃, n(EDA)/n(MA)=1/8, solvent methanol 30%; The optimum reaction conditions of synthesis 1.0 generation PAMAM dendrimers are as follows: reaction time 24h, reaction temperature 25℃, n(0.5G)/n(EDA)=1/12, solvent methanol 20%. Repeated Michael addition and Ester Amide reaction, it can be followed by 2.0 generation, 3.0 generation PAMAM dendrimers. Using infrared spectroscopy (IR), 1H-NMR, elemental analysis of various methods, the products are characterized to be the target molecular structure. Through the degrease experiments on well liquid drainage from Gudao 4th joint station by the pharmaceutical Luomanhasi and PAMAM dendrimers, it shows that the 3.0 generation PAMAM has the best results in oil removal rate to 85.1 % at the additive dose of 70 mg/L, and the suspended solids are removed from 138 mg/L reduced to 73 mg/L. The deoiling effect is far better than those of the scene pharmacy Luomanhasi.Explore the effect of different conditions on synthesis of the magnetic nano-material modified dendrimer wastewater treatment reagent. We obtained the best conditions on synthesis of PF series wastewater treatment reagent: n (PAMAM)/n(Total Fe) = 0.5, reaction temperature 70℃, pH value 8～9, coating time 30min. Through the infrared spectrum, transmission electron microscopy and vibration sample magnetometer, the nano-material modified dendrimer wastewater treatment reagent is characterized to be Fe3O4 powder around 30nm, And has paramagnetic. The PF-0.5 wastewater treatment reagent can remove the oil in water from 1328.1mg/L to 42.1mg/L at the additive dose of 80mg/L, suspended solids from 143mg/L down to 61mg/L. Study on the applicability of PF-0.5 wastewater treatment reagent shows that it has certain rifely adaptability to the sewage of three Gudao joint station. |
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