Synthesis And Application Of A Novel Series Of Cation Hydrophobically Modified Polyacrylamide

Based on the pollution situation of EOR (enhanced oil recovery) wastewater, a novel series of cation surface active monomer (surfmer), Acryloxybutyldimethyldodeylammonium bromide (DMABA) were designed and synthesized. A novel series of hydrophobically modified polyacrylamide (HMPAM) were synthesized with DMABA. The micellization behavior conductivity, solubility of surfmer in aqueous solution were investigated and the synthesis technology of HMPAM, hydrophobic association behavior in aqueous solution and the reaction between HMPAM and small molecular electrolyte or surfactants were researched in system. The results showed that the wastewater treatment efficiency of HMPAM was remarkble.A novel series of cation surface active monomer DMABA were designed and synthesized with N,N'-dimethyl-butyl amine Acryloyloxyethyl and Alkyl bromide. The structure of DMABA was characterized by Fourier transform infrared spectroscopy (FT-IR) and hydrogen-1 nuclear magnetic spectrum ('H-NMR). The cmc of three surfmer was 11.7 mmol/L,2.7 mmol/L and 0.8 mmol/L by the measurements of steady fluorescence. The same result was got with conductivity method and UV spectrophotometry. The solubility of DMABA was also researched by UV spectrophotometry. As the increasing of the alkyl carbon chain length, the critical micelle concentration (cmc), the turning point, solubility decrease and the krafft temperature was increased.With AM, DAC and DMABA12, the series of HMPAM were synthesized with different content of DMABA 12, while the synthesis technology such as the type and amount of initiator,concentration of the total monomer,reaction temperature were optimized (the reaction condition: solid contant:25wt%; initiator:AIBA, NaHSO3, (NH4)2S2O8, temp:10℃). The structure of HMPAM was investigated by FT-IR and 13C solid nuclear magnetic spectrum 13C-NMR. The structure has been defined through those measurements.The hydrophobic association behavior and aggregates of HMPAM was researched in emission and excitation steady fluorescence. Micellar aggregation number was got by steady-state fluorescence quenching method. The distribution of the HMPAM aggregates was studied by dynamic laser light scattering method and the microscopic structure and morphology of the aggregate was observed through transmission electron microscope. As the content of DMABA 12 increasing, the hydrophobic association behavior was more intense, meant the surfmer DMABA 12 could regulate the hydrophobic performance of HMPAM. The viscosity change of HMPAM and the interactions among SDS, CTAB, NaCl and HMPAM, which can influence the parent viscosity, were detected in detail by method of viscometry. The conclusions were in the follow:the viscosity of HMPAM3.0 is the highest in the same concentration at room temperature, and the viscosity is higher than HPAM without DMABA 12. It shows that DMABA is helpful to the copolymer to associate inter-molecular and intra-molecular. The viscosity change of HMPAM with SDS, the viscosity range changing of HMPAM1.0 is the most because SDS could promote the association between molecular of copolymer to form nerwork structure so to enhance the flocculation ability.Finally, the performance of HMPAM and HPAM in dealing with simulated oil field wastewater was studied and the result of HMPAM was founded better than HPAM, especially HMPAM1.0. The oil removal rate reached 90.9% when dealing with the simulated oil field wastewater containing 50mg/L NP. It reached 89.7% when containing 50mg/L CTAB and the number is 86.1% when containing 50mg/L SDS. It meant that the idea synthesizing HMPAM with a surfmer and the results, which HMPAM to be used to deal with the waste of EOR (enhanced oil recovery) was excellent.