Preparation And Properties Of NPEAA/AEPH And NPEAA/MAA/MMA Modified Hydrosilicone Oil Containing Benzene

With the rapid development of economy,the demand for oil in modern industry is increasing day by day.Currently,the amount of crude oil that is easy to extract is decreasing,many countries focus on the development of heavy oil with high reserves.Due to the high viscosity of heavy oil,containing more natural emulsifiers such as asphaltene and colloid,and the increase of a large number of chemical auxiliaries in the tertiary oil recovery stage,the free water and heavy oil are fully mixed to form a stable emulsion,which will bring harm to its refining,processing,transportation and other processes,so it is necessary to carry out dehydration.However,in the process of demulsification of heavy oil,there are some problems such as weak dissolving and dispersing ability of demulsifier,large energy consumption and difficulty of dehydration during demulsification.Therefore,it is of great significance to develop high efficiency heavy oil demulsifiers at low temperatures.In view of this,aiming at Chenzhuang heavy oil in Shengli Oilfield,this paper designs and synthesizes two kinds of silicone demulsifier,by introducing hydrophilic groups into the main chain of phenyl hydrogen-containing silicone oil with high and low temperature resistance,research on its demulsification performance,the main elements are as follows:1.Using p-toluenesulfonic acid as a catalyst and hydroquinone as a polymerization inhibitor,acrylic acid(AA)and nonylphenol polyoxyethylene polyoxypropylene ether(NPE-108)were directly esterified to synthesize nonylphenol polyoxyethylene polyoxypropylene acrylate(NPEAA)was used as an intermediate for silicone heavy oil demulsifiers,and its structure was characterized by FTIR and 1H NMR.The effects of reaction time,reaction temperature,n(AA):n(NPE-108),amount of catalyst and polymerization inhibitor on the esterification rate were discussed.On this basis,the response surface analysis method was used to optimize the process parameters of the esterification reaction.Compared with NPE-108,the surface activity of the esterified NPEAA was enhanced.2.Using chloroplatinic acid as a catalyst,isopropyl alcohol as a solvent,NPEAA and allyl polyoxyethylene polyoxypropylene epoxy-terminated polyether(AEPH)as raw materials,through the hydrosilylation reaction,the phenyl hydrogen-containing silicone oil was modified,and NAEPHS containing hydrophilic and lipophilic groups was synthesized.Using Si-H conversion and surface tension as indicators,the influence of different factors on NAEPHS was explored.Orthogonal experiments were used to determine the optimal synthesis conditions,and the structure was characterized by FTIR and ’H NMR.The optimum ratio of n(NPEAA):n(AEPH)was determined.The critical micelle mass concentration CMC was determined by the wilhelmy method and the fluorescence spectrometer to be 0.6 g/L,and the minimum surface tension γCNC was 26.08 mN/m.The demulsification performance of Chenzhuang heavy oil was studied,under the conditions of NAEPHS concentration of 0.6 g/L,demulsification temperature of 45℃ and demulsification time of 1.5 h,the dehydration rate is 89.72%,the oil content in the water is as low as 189.7 mg/L.3.Chloroplatinic acid was used as catalyst,methacrylic acid(MAA),methyl methacrylate(MMA),and NPEAA were used as hydrophilic and li pophilic groups,through the hydrosilylation reaction,the phenyl-containing hydrogen silicone oil was modified to obtain MAA-MMA-NPHS with multibranched structure.Taking the Si-H conversion rate and surface tension as indicators,the influence of each main factor on MAA-MMA-NPHS was discussed.The synthesis process parameters were optimized using uniform design experiments.The structure was characterized by FTIR and ’H NMR.The CMC was measured to be 0.8 g/L and γCMC was 26.17 mN/m.The ratio of hydrophilic and lipophilic groups was adjusted,and the dem-ulsification performance of Chenzhuang heavy oil was studied.At n(MAA):n(NPEAA):n(MAA)=8:2:2,demulsifier dosage 0.8 g/L,demulsification tempe rature 50℃,demulsification time 2h,The dehydration rate reached 86.67%,and the oil content of the extracted water was as low as 153.9 mg/L.4.Using Chenzhuang heavy oil emulsion(W/O)as the demulsification object,the demulsification performance of NAEPHS,MAA-MMA-NPHS and three commercially available AE2010,SP169,N81800 demulsifiers were compared.The Turbiscan Lab stability analysis tester was used to analyze the demulsification process.The demulsification effect of NAEPHS,MAA-MMA-NPHS was better than the other three commercially available demulsifiers.The demulsification effects of NAEPHS and MAA-MMA-NP HS were evaluated for Chenzhuang heavy oil,Weihai crude oil,Binzhou crude oil,and Merry crude oil in Ning138 District of Heshui County,Gansu Province.The effects of NAEPHS and MAA-MMA-NPHS demulsifiers on the viscosity of Chenzhuang heavy oil system and the interfacial tension between oil and water were also analyzed.The microdemulsification process was analyzed.The demulsification process was the replacement demulsification mechanism.