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Dissolving pulp

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  • The possibilities of dissolving grade pulp production from poplar by an ethanol-water process were investigated. The effects of ethanol ratio, cooking temperature and acid catalyst ratio on unbleached, bleached and alkali-purified pulps were studied. It was seen that catalyst ratios exceeding 0.01% caused serious yield and viscosity losses.

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  • The addition of a laccase inducer, xylidine, into the culture medium of T. versicolor led to an increase in dechlorination activity. In the experiment performed to find out the role of laccase activity in dechlorination reactions, a considerable reduction in the dissolved oxygen concentration due to laccase-dependent dechlorination activity was observed.

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  • When revealing many such cause-effect relations and hidden phenomena, hand-held instrumentation gives additional references for existing basic measurements such as pH, conductivity, and redox potential. This work also took in use measurements which have not been traditionally used in papermaking such as measurement of halogens, dissolved calcium, and dissolved oxygen contents. ATP content measurement using a portable luminometer was found to be useful and easy-to-use method for evaluating microbial activity and optimizing biocide performance at paper mills.

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  • Traditionally non-wood pulps were produced by alkaline processes. Alkaline processes such as soda (Mohta et al. 1998, Tutus & Eroglu 2003, Feng & Alen 2001, Finell & Nilsson 2004, Okayama & Li 1996) and the NACO process (Recchia et al. 1996, Fiala & Nardi 1985, Paul 2001) have been used to produce non-wood pulp in mills. The main problem with alkaline processes for non- wood fibres is that silicates of non-wood plants dissolve during cooking into the cooking liquor.

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  • Two approaches were selected for the study, both of which were based on an initial hot water treatment: the “chemical” where bleached pulp is produced for printing and writing papers by hot water treatment and the following alkaline peroxide bleaching (Paper II–IV) and the “mechanical” where the unbleached material from the hot water treatment stage is mechanically refined (Paper II, V) to produce fibres for packaging grade papers. In the future, the straw fibre could be considered as a raw material for biocomposites.

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