Disc like molecule which was formed by fused polyaromatics was found to be with discotic liquid crystal properties. So it has been researched thoroughly. We take 5,6,11,12,17,18-hexaazatrinaphthylene (HTN) as our central core and synthesize Hexa-O-substituted hexaazatriphenylene, a new molecule with discotic liquid crystal properties successfully.

Unsymmetrical discotic liquid crystals based on hexaazatriphenylene(HAT) have not been published until today.We have used tetrahydoxyquinone as the starting material to synthesis unsymmetrical discotic liquid crystals based on HAT and investigate their properties of liquid crystal.

Submitted by Caroline Falcao (caroline.rfalcao@ufpe.br) on 2017-06-07T16:59:09Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) 2012-Dissertacao-FlavioLopes.pdf: 1974201 bytes, checksum: d403ec49ecc5be27ebcf54b9f6f2a5de (MD5) / Made available in DSpace on 2017-06-07T16:59:09Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) 2012-Dissertacao-FlavioLopes.pdf: 1974201 bytes, checksum: d403ec49ecc5be27ebcf54b9f6f2a5de (MD5) Previous issue date: 2012-06-27 / Dentre os processos utilizáveis para a purificação de correntes residuais oriundas da obtenção das manufaturas advindas do petróleo, destaca-se a extração em fase líquida, utilizada, por exemplo, na desaromatização dos óleos básicos parafínicos. As correntes residuais obtidas nesta desaromatização podem ser purificadas utilizando esta mesma técnica, para propiciar sua utilização em outros fins industriais. Na indústria de pneus, a necessidade de diminuição dos altos teores de hidrocarbonetos policíclicos aromáticos (HPA) apresentados pelos extratos residuais da indústria petroquímica já foi observada por órgãos ambientais e governamentais. Deve-se considerar a seletividade e o rendimento para a escolha do solvente a utilizar. Tais características conferem eficiência no procedimento de purificação dos extratos obtidos, com a diminuição dos teores de HPA do extrato aromático, por exemplo, utilizado pela indústria de pneus como plastificante e extensor da borracha. Estudos de extração em fase líquida para sistemas ternários são comuns. Entretanto, dados experimentais de equilíbrio líquido-líquido (ELL) multicomponente, entre solventes e extratos contendo compostos poliaromáticos, para aplicação na extração de HPA em matriz alifática de alto ponto de ebulição (acima de 300ºC), são muito escassos ou inexistentes. Além disso, os dados de ELL de sistemas ternários foram medidos em temperaturas próximas da ambiente, distantes das temperaturas de interesse industrial (acima de 70ºC). Neste trabalho foram medidos dados de ELL para os sistemas sulfolane + n-hexadecano + xileno + pireno; dietileno glicol (DEG)+ n-hexadecano + xileno + pireno; N-metil - pirrolidona (NMP) + monoetileno glicol (MEG)+ n-hexadecano + xileno + pireno. Os equilíbrios estudados nos apresentaram resultados adversos na eficiência de extração. Para o sistema com sulfolane, houve uma boa eficiência na extração do pireno, o que não ocorreu com os sistemas com DEG e NMP+MEG, fato comprovado pelos gráficos das linhas de amarração (tielines) obtidos para cada um dos sistemas e com os cálculos de coeficiente de partição (D) e eficiência da extração (S). Para a extração do xileno, os sistemas apresentaram o aceitável na realidade industrial: o aproveitamento de extração dos três sistemas foi baixo. / Among the usable processes for the purification of residual currents originating from the obtaining of the manufacture originating of the petroleum, we highlight out the extraction in liquid phase, used, for example, in the desaromatization of the basic paraffinic oils. The residual currents obtained in this desaromatization can be purified using this same technique, to propitiate its use in other industrial ends. In the industry of tires, the need of decrease of the high grades of polycyclic aromatic hidrocarbons (HPA) presented by the residual extracts of the petrochemical industry was observed already by environmental and government bodies. It should be considered the selectivity and the income for the choice of the solvent to use. Such characteristics check efficiency in the procedure of purification of the obtained extracts, with the decrease of the grades of HPA of the aromatic extract, for instance, used by the industry of tires as plasticizer and extending of the rubber. Extraction studies in liquid phase for ternary systems are common. However, experimental data of multicomponent liquid-liquid balance (ELL), between solvents and extracts containing composed polyaromatics, for application in the extraction of HPA in head office aliphatic of high ebullition point (above 300ºC), healthy very scarce or inexistent. Besides, the data of ELL of ternary systems were measured in near temperatures of the atmosphere, distant of the temperatures of industrial interest (above 70ºC). In this work they were measured data of ELL for the systems sulfolane + n-hexadecane + xylene + pyrene; diethyilene glycol (DEG) + nhexadecane + xylene + pyrene; N-methyl - pyrrolidone (NMP) + monoethylene glycol (MEG) + n-hexadecane + xylene + pyrene. The studied balances us they presented adverse results in the extraction efficiency. For the system with sulfolane, there was a good efficiency in the extraction of the pyrene, what didn't happen with the systems with DEG and NMP+MEG, proven fact for the tielines graphs obtained for each one of the systems and with the calculations of partition coefficient (D) and extraction efficiency (S). To the extraction of the xylene, the systems presented what is wanted in the industrial reality: the use of extraction of the three systems was low.