Made available in DSpace on 2014-12-17T15:42:07Z (GMT). No. of bitstreams: 1 MarconiSFO_DISSERT.pdf: 4822002 bytes, checksum: 2debc2b37aed6dad6d1e0bb06a153e64 (MD5) Previous issue date: 2013-07-31 / The underground natural gas found associated or not with oil is characterized by a mixture of hydrocarbons and residual components such as carbon dioxide (CO2), nitrogen gas (N2) and hydrogen sulfide (H2S), called contaminants. The H2S especially promotes itself as a contaminant of natural gas to be associated with corrosion of pipelines, to human toxicity and final applications of Natural Gas (NG). The sulfur present in the GN must be fully or partially removed in order to meet the market specifications, security, transport or further processing. There are distinct and varied methods of desulfurization of natural gas processing units used in Natural Gas (UPGN). In order to solve these problems have for example the caustic washing, absorption, the use of membranes and adsorption processes is costly and great expenditure of energy. Arises on such findings, the need for research to active processes of economic feasibility and efficiency. This work promoted the study of the adsorption of sulfide gas in polymer matrices hydrogen pure and modified. The substrates of Poly(vinyl chloride) (PVC), poly(methyl methacrylate) (PMMA) and sodium alginate (NaALG) were coated with vanadyl phosphate compounds (VOPO4.2H2O), vanadium pentoxide (V2O5), rhodamine B (C28H31N2O3Cl) and ions Co2+ and Cu2+, aiming to the adsorption of hydrogen sulfide gas (H2S). The adsorption tests were through a continuous flow of H2S in a column system (fixed bed reactor) adsorption on a laboratory scale. The techniques used to characterize the adsorbents were Infrared spectroscopy (FTIR), thermogravimetry analysis (TGA), X-ray fluorescence (XRF), the X-ray diffraction (XRD) electron microscopy (SEM). Such work indicates, the results obtained, the adsorbents modified PMMA, PVC and NaALG have a significant adsorptive capacity. The matrix that stood out and had the best adsorption capacity, was to ALG modified Co2+ with a score of 12.79 mg H2S / g matrix / O g?s natural encontrado no subsolo associado ou n?o ao petr?leo se caracteriza por uma mistura de hidrocarbonetos e componentes residuais tais como o di?xido de carbono (CO2), o g?s nitrog?nio (N2) e o sulfeto de hidrog?nio (H2S), denominados de contaminantes. O H2S em especial se promove como contaminante do g?s natural por estar associado ? corros?o de dutos (gasodutos), ? toxidade humana e a aplica??es finais do G?s Natural (GN). O teor de enxofre presente no GN deve ser totalmente ou parcialmente removido, visando atender as especifica??es de mercado, seguran?a, transporte ou processamento posterior. H? distintos e variados m?todos de dessulfuriza??o do g?s natural usados nas Unidades de Processamento do G?s Natural (UPGN). Visando solucionar tais problemas temos como exemplo a lavagem c?ustica, a absor??o, o uso de membranas e a adsor??o, sendo processos onerosos e com grande disp?ndio energ?tico. Surge, diante de tais constata??es, a necessidade de pesquisa de processos ativos de viabilidade econ?mica e efici?ncia. O presente trabalho promoveu o estudo da adsor??o do g?s sulfeto de hidrogr?nio em matrizes polim?ricas puras e modificadas. Os substratos de Poli(cloreto de vinila) (PVC), Poli(metacrilato de metila) (PMMA) e alginato de s?dio (NaALG), foram recobertos com os compostos de fosfato de vanadila (VOPO4.2H2O), pent?xido de van?dio (V2O5), rodamina B (C28H31N2O3Cl) e os ?ons Co2+ e Cu2+, objetivando-se a adsor??o do g?s sulfeto de hidrog?nio (H2S). Os ensaios de adsor??o se deram atrav?s de um fluxo cont?nuo de H2S em um sistema de coluna (reator de leito fixo) de adsor??o em escala de laborat?rio. As t?cnicas utilizadas para a caracteriza??o dos adsorventes foram ? espectroscopia de infravermelho (FTIR), a an?lise termogravimetria (TG), a fluoresc?ncia de raios X (FRX), o difra??o de raios X (DRX), a microscopia eletr?nica de varredura (MEV). Tal trabalho indica, pelos resultados obtidos, que os adsorventes modificados de PMMA, PVC e NaALG t?m uma capacidade adsortiva significativa. A matriz que se destacou e apresentou a melhor capacidade de adsor??o, foi a de ALG modificada com Co2+ tendo um resultado de 12,79 mg de H2S/g de matriz

Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2016-04-05T18:07:42Z No. of bitstreams: 2 dissertacao - Leandro Rodrigues da Silva Souza - 2015.pdf: 16210462 bytes, checksum: 475bed9248c2dcb7bf0346adfc69a5f0 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-04-06T12:44:50Z (GMT) No. of bitstreams: 2 dissertacao - Leandro Rodrigues da Silva Souza - 2015.pdf: 16210462 bytes, checksum: 475bed9248c2dcb7bf0346adfc69a5f0 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Made available in DSpace on 2016-04-06T12:44:50Z (GMT). No. of bitstreams: 2 dissertacao - Leandro Rodrigues da Silva Souza - 2015.pdf: 16210462 bytes, checksum: 475bed9248c2dcb7bf0346adfc69a5f0 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) Previous issue date: 2015-02-20 / In order to collaborate with technology and accessibility, this work proposes the development of a Space Frame chassis, constructed with polyvinyl Chloride (PVC). To the development were used PVC tubes and fittings, commonly used in civil builders. The essential parameters of the PVC were obtained experimentally and used to simulate the chassis. Along the development, analyses of tension and deformation were made in the proposed structure. Using computer simulation, the finite element analysis could provide the structure behaviour in different scenarios, as bending, tension and deformation. / Com o intuito de colaborar com o campo da tecnologia e acessibilidade, este trabalho propõe o desenvolvimento de uma estrutura veicular do tipo Space Frame, construída a partir de tubos de policloreto de Vinila (PVC). Para tanto, foram utilizados tubos e conexões de PVC normalmente empregados na construção civil. Os parâmetros essenciais do PVC para a simulação foram obtidos experimentalmente. São realizadas análises de tensões e deformações da estrutura, por meio de simulação computacional, utilizando um solver de Elementos Finitos, propiciando análise do protótipo, sob condições de solicitação a flexão devido a cargas distribuídas sobre as suas regiões.