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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Reactions of lignin model quinone methides and NMR studies of lignins

Ralph, John. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
2

Evaluation of the bleach-enhancing effects of xylanases on bagasse-soda pupil

Bissoon, Sadhvir January 2002 (has links)
Submitted in fulfillment of the requirements for the Degree of Doctor of Technology: Biological Sciences, M.L. Sultan Technikon, 2002. / The extent of diffusion and surface modification of a purified 23.6 kDa xylanase isolated from Thermomyces lanuginosus on bagasse pulp was evaluated. Polyclonal anti-xylanase antibodies were raised in two rabbits and in conjunction with immunogold labeling and microscopic studies enzyme diffusion and degradation studies were performed. The purity of the xylanase was confirmed by SDS-PAGE and western blots confirmed the antigen-antibody hybrid on the nitrocellulose membrane. / D
3

Estudo da influência de carga alcalina na polpação Soda com pré-hidrólise de eucalyptus urograndis para produção de etanol, lignina e furfural /

Moriyama, Aline Tomie Poglitsch January 2019 (has links)
Orientador: Gustavo Ventorim / Resumo: O conceito de biorrefinaria surgiu do intuito de diminuir a dependência dos produtos oriundos do petróleo e seus consequentes problemas ambientais. Pesquisas buscam técnicas e materiais que substituam a matéria prima de origem fóssil por biomassa, agregando valor a produtos de origem renovável ou que anteriormente seriam descartados. A produção de combustíveis de 2ª geração (como bioetanol) possibilita o repasse de um custo razoável ao setor de transporte devido ao uso de matéria prima de baixo custo. A composição de forte associação entre celulose, hemicelulose e lignina exige uso de um método de pré-tratamento que atenue a interação entre os componentes da biomassa e facilite a conversão em bioprodutos. Este trabalho tem como objetivo estudar a combinação de pré-tratamentos, auto-hidrólise e polpação soda na obtenção de pasta celulósica a partir de cavacos de eucalipto. Esta polpa passa por processo de hidrólise ácida liberando açúcares que, na presença de microrganismos específicos (Saccharomyces cerevisiae) são fermentados a etanol. Cavacos de eucalipto pré-tratados por auto-hidrólise passaram por cozimentos soda em concentração de álcali ativo de 20%, 23% e 26%, estudando-se a influência da concentração de álcali no rendimento de produção de bioetanol. A polpação utilizando 20% de álcali ativo produziu rendimento de 130,30 L de etanol a partir de uma tonelada de cavacos, tendo maior impacto no rendimento que as polpações de 23% de álcali ativo, que foi responsável por um... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The concept of biorefinery appear from the idea of reducing dependence on petroleum products and their consequent environmental problems. Researches seek techniques and materials that substitute the feedstock of fossil origin for biomass, adding value to products of renewable origin or that would previously be discarded. The production of second-generation fuels (such as bioethanol) makes it possible to pass along a reasonable cost to the transportation sector due to low cost raw materials use. The strong association between cellulose, hemicellulose and lignin requires a pretreatment method that attenuates the interaction between biomass components and facilitates the conversion into bioproducts. It was studied the combination of, auto-hydrolysis and soda pulping (alkaline) pre-treatments to efficiently obtain cellulose must go through acid hydrolysis process. This pulp after being hydrolized liberates sugars that, in the presence of specific microorganisms (Saccharomyces cerevisiae), could be fermented to ethanol. Eucalyptus pretreated by auto-hydrolysis method were treated by soda pulping in active alkali concentration of 20%, 23%b and 26%, studying the influence of the alkali concentration on the yield of bioethanol. Pulping using 20% active alkali yielded 130,30L of ethanol from one ton of chips, which has better impact than the 23% active alkali pulping, which was responsible for a production of 118,8 L of ethanol and 26% active alkali pulping that produced 101,9L. All y... (Complete abstract click electronic access below) / Mestre

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