Pre-hydrolysis kraft dissolving pulp from Bambusa vulgaris and Dendrocalamus asper bamboos biomass

Marcelo Moreira Costa, Weslley Henrique Martins Silva, Ricardo Carvalho Bittencourt,Felipe Pedersoli Borges, Priscila Moreira Silva,Sebastião Renato Valverde

Research Square (Research Square)(2022)

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摘要
Abstract In Brazil, bamboo emerges as a potential non-wood raw material as alternative lignocellulosic biomasses source, since this crop has high rusticity and productivity. It grows even in poor soil and shortage of water conditions, and it has a harvest cycle close to 2 years. This study aimed to produce dissolving pulp from the bamboo species Bambusa vulgaris and Dendrocalamus asper seeking to optimize the process conditions, in order to obtain a final product with the specification’s parameters for viscose grade. Bamboo chips of Bambusa vulgaris and Dendrocalamus asper with 2 years old were submitted to pre-hydrolysis kraft pulping process. After pre-hydrolysis kraft pulping Bambusa vulgaris showed screened yield of 34.2% and a xylan content of 3,47% and Dendrocalamus asper showed screened yield of 34,7% and a xylan content of 2,65. Based on these results, only Dendrocalamus asper was selected and bleached. After optimizing the bleaching process the final kappa number of 0.20, viscosity of 465 dm3/kg and 90.6% brightness were obtained for Dendrocalamus asper. Were achieved 1,76% of xylan, 98,1% of glycan and 0.10% of ash content. Was concluded that Dendrolocamus asper can be applied for the production of dissolving pulp. The CCE stage, under the established conditions, did not show to be efficient in removing the xylans from Dendrocalamus Asper brown pulp. On the other hand, further work is needed to optimize the main stages of the process, such as the pre-hydrolysis connected to kraft pulping, as well as the stabilization of carbohydrates chains against bleaching oxidants.
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关键词
dendrocalamus asper bamboos biomass,pulp,bambusa vulgaris,pre-hydrolysis
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