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Series E- triazine surfactant flooding study

Author: LiJing
Tutor: QiaoWeiHong
School: Dalian University of Technology
Course: Fine Chemicals
Keywords: Triazine surfactants Double long -chain E Ultra-low interfacial tension Mechanism
CLC: TE39
Type: Master's thesis
Year: 2011
Downloads: 85
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Abstract


In this thesis, through the design and synthesis of triazine series of alkali flooding with pure surfactant, study their structure and interfacial properties, and to explore the ability of the oil / water interfacial tension to ultra-low for this type of surface surfactant molecular structure, a microscopic explanation of the type of surfactant molecules to ultralow interfacial tension reduction mechanism of action, in order for the EOR surfactant molecules designed to provide a theoretical basis. First, fatty amines and cyanuric chloride as the starting material, synthesized a series of different carbon chain lengths and different carbon chain alkanes symmetry of single / double long-chain 1,3,5 - triazine surfactants (abbreviated respectively for the A-MCTn, A-DCTn-m) homologue pure compounds by electrospray ionization mass spectrometry, nuclear magnetic resonance spectroscopy and 1H and 13C spectra and infrared spectra intermediate target products were characterized structure is correct. Secondly, the synthetic surfactant interfacial properties were studied. Relative to A-MCTn, A-DCTn-m has a high surface activity. Focus on the double long-chain 1,3,5 - triazine surfactants alkane / water system and oil / water interfacial tension behavior of the system were studied. Alkane selectivity results show, A-DCTn-m minimum alkane carbon number (nmin) consistent with their structure, the more carbon atoms, nmin greater. Single surfactant system on the dynamic interfacial tension of alkanes curve monotonically decreasing, while crude oil / water system appears dynamic interfacial tension minimum. A-DCT8-8, A-DCT10-8, A-DCT12-8, A-DCT10-10 and A-DCT12-10 to the oil / water interfacial tension to ultra-low, only A-DCT10-8 and A -DCT12-8 in a wide concentration and type of surfactant oil systems remain low interfacial tension, the surfactant structure and the description of the carbon chain length of the interfacial tension reduction has an impact. In addition, the effects of temperature, sodium chloride, surfactants homologues complex system, polymers and sodium carbonate on the A-DCTn-m surfactants reduce oil / water interfacial tension. The results show that the series of surface-active agent has a certain temperature resistance and salt tolerance; suitable homologues complex that system with high interfacial activity; adding polymers to make the system interfacial tension rises; adding sodium carbonate to make systems to ultra-low interfacial tension, but different amounts of different surfactant systems. Discusses the amphoteric surfactant MAS oil / water interfacial tension behavior, carboxylate-type surfactants interface MAS highest activity. Finally, to explore the mechanism of the formation of low interfacial tension was found at low surfactant concentrations, the surfactant molecules do not pass through the interface diffusion of mass from the aqueous phase into the oil phase, A-DCT6-6 molecules were well below the interface A-DCT12-8 molecules at the interface of the content, but they can form a middle phase microemulsion. Therefore, the mechanism of the formation of ultra-low interfacial tension may be caused by surfactant molecules at the interface layer adsorption capacity and adsorption state decisions.

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