result

https://www.repositorio.ufop.br/bitstream/123456789/6683/1/ARTIGO_StarchPVANanocomposites.pdf

Estudos das potencialidades do Bambusa vulgaris para producao de papeis tipo kraft

Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils

The coconut husk is a residue from consumption of coconut water. In coastal cities this residue has already become a big problem, because it is difficult to decompose. The present study aimed to evaluate the husk of the coconut (Cocos nucifera L.) for production of kraft pulp. The raw material was characterized and had its basic density, chemical composition, fiber size and proportion of anatomical elements analyzed. Pulping tests were conducted and one of them was chosen for repetition. In each pulping the alkali charge was variable in order to prepare an alkaline curve. The results from the pulping process show high levels of kappa number, low yields and low rejects content. The following characteristics of the material, low basic density (0.128 g/cm ³), high amount of extractives (33.68%) and low proportion of fibers (22.11%), corroborate to these results. Thus, the production of pulp from the coconut husk by the kraft process, it is not an alternative technically feasible.

/pdf/aproveitamento-da-casca-do-coco-verde-cocos-nucifera-l-para-107eesa14f.pdf

APROVEITAMENTO DA CASCA DO COCO-VERDE (Cocos nucifera L.) PARA PRODUÇÃO DE POLPA CELULÓSICA

Evaluation of soda-antraquinone and magnesium base bisulfite pulping processes with bamboo The present study had as objective evaluates and to compare the soda-antraquinone and magnesium base bisulfite pulping processes for Bambusa vulgaris Schrad. with 2 years old originating from commercial plantings in Maranhão – Brazil seeking the production of bleachable and unbleachable cellulosic pulp grade's (kappa numbers 30±2 and 50±2 respectively). The raw material was characterized regarding the basic density, chemical composition and dimensions of fibers; for to the pulping processes was evaluated the total time of cooking, H factor, total yield, screened yield, rejects, load of chemical reagents and physicalmechanical properties of the pulps. The obtained results show that the raw material presented typical values for the species in subject in what says respect to the basic density, dimensions and morphologic indexes of the fibers and chemical composition. For the soda-antraquinone pulping process the certain levels of delignification (kappa numbers) were obtained with alkaline loads of 15 and 19% (NaOH base) respectively and a H factor of 1218; for the magnesium base bisulfite process the cellulosic pulps with the established levels of delignification were obtained with a fix load of chemical reagents 26% (SO2 base) and H factor of 1218 for pulps with kappa number 30±2 and 828 for pulps with kappa number 50±2; the necessary total time of cooking to the sodaantraquinone process to obtain the wanted cellulosic pulps are, on average, 3,82 time less when compared with the bisulfite process. Additionally the screened yields were 3 and 4,63 percent superior for the pulps with numbers kappa 30±2 and 50±2 respectively in the soda-antraquinone process. The physical-mechanical tests show the differences among the pulps in what says respect to the used pulping process as in the delignification level, being this last one a factor of differentiation of the products (paper) that can be obtained starting from the cellulosic pulps. Comparing the pulping processes as what concerns of physical-mechanical properties the superiority of the soda-antraquinone pulps is observed except in freeness and density parameters. The results obtained in this work show that for the production of cellulosic pulp from Bambusa vulgaris the soda-antraquinone process it is superior than the magnesium base bisulfite process as much in the aspects of engineering process (quantitative) as in the aspects related to the quality of the obtained pulp.

/pdf/avaliacao-dos-processos-de-polpacao-soda-antraquinona-e-3v0j6n1nea.pdf

Avaliação dos processos de polpação soda-antraquinona e bissulfito-base magnésio para bambu

https://bdm.unb.br/bitstream/10483/1404/1/2010_EraldoBonfattiJunior.pdf

Caracterização das propriedades anatômicas, química e densidade da espécie Bambusa vulgaris Schrad. ex J.C. Wendl., para a produção de celulose Kraft com diferentes cargas de Álcali.

background

/pdf/aproveitamento-da-casca-do-coco-verde-cocos-nucifera-l-para-h7cb5fl8fk.pdf

APROVEITAMENTO DA CASCA DO COCO-VERDE (Cocos nucifera L.) PARA PRODUÇÃO DE POLPA CELULÓSICA UTILIZACION OF COCONUT HUSK (Cocos nucifera L.) FOR CELLULOSE PULP PRODUCTION