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dc.contributor.authorKosa, Matyasen_US
dc.date.accessioned2013-01-17T21:46:36Z
dc.date.available2013-01-17T21:46:36Z
dc.date.issued2012-08-30en_US
dc.identifier.urihttp://hdl.handle.net/1853/45836
dc.description.abstractLignin is the second most abundant biopolymer on Earth, right after cellulose, with a highly complex chemical structure that hinders its possible utilizations. Applications that utilize lignin in different manners are of great interest, due to its inexpensive nature. Present work is based on the notion of converting lignin into different biofuels that have only a few, however important, advantages over lignin as a direct energy source. The first part of current work (pyrolysis) details the analysis of lignin from a relatively new lignin isolation process called LignoBoost. It is obtained from the pulp and paper industry via CO₂ precipitation of lignin from black liquor (BL). This method is environment friendly, results lignin with minimal oxidation, eliminates the main bottleneck of the Kraft cycle (recovery boiler capacity), and yet leaves enough lignin in the process stream to recover pulping chemicals and generate energy for the pulp mill. Pyrolysis had converted this lignin into bio-oil with high aliphatic content and low oxidation level, all advantageous for application as liquid fuel. The second part of this dissertation proved the theory that lignin degradation and lipid accumulation metabolic pathways can be interconnected. Gram-positive Rhodococcus opacus species, DSM 1069 and PD630 were used to evaluate lignin to lipid bioconversion, starting with ethanol organosolv and Kraft lignin. This conversion is a first step in a multistep process towards biodiesel production, which includes transesterification, after lipids are extracted from the cells. Results clearly indicated that the lignin to lipid bioconversion pathway is viable, by cells gaining up to 4 % of their weight in lipids, while growing solely on lignin as a carbon and energy source.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectLigninen_US
dc.subjectLipiden_US
dc.subjectOleaginous bateriaen_US
dc.subjectRhodococcusen_US
dc.subjectBeta-ketoadipateen_US
dc.subjectPyrolysisen_US
dc.subject.lcshBiomass conversion
dc.subject.lcshBiomass energy
dc.subject.lcshEnergy crops
dc.titleDirect and multistep conversion of lignin to biofuelsen_US
dc.typeDissertationen_US
dc.description.degreePhDen_US
dc.contributor.departmentChemistry and Biochemistryen_US
dc.description.advisorCommittee Chair: Arthur J. Ragauskas; Committee Member: Nicholas V. Hud; Committee Member: Preet Singh; Committee Member: Sheldon W. May; Committee Member: Yulin Dengen_US


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