Artículos científicos

URI permanente para esta colecciónhttp://10.0.96.45:4000/handle/11056/14823

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Biogenic silica-based microparticles obtained as a sub-product of the nanocellulose extraction process from pineapple peels
(Nature Publishing Group, 2018-07-10) Corrales-Ureña, Yendry R.; Villalobos-Bermúdez, Carlos; Pereira, Reinaldo; Camacho, Melisa; Estrada, Eugenia; Argüello-Miranda, Orlando; Vega-Baudrit, Jose R.
Silica in plant tissues has been suggested as a component for enhancing mechanical properties, and as a physical barrier. Pineapples present in their shell and bracts rosette-like microparticles that could be associated to biogenic silica. In this study, we show for the first time that silica-based microparticles are co-purified during the extraction process of nanocellulose from pineapple (Ananas comosus). This shows that vegetable biomass could be an underappreciated source, not only for nanocellulose, but also for a highly valuable sub-product, like 10 µm biogenic rosette-like silica-based microparticles. The recovery yield obtained was 7.2 wt.%; based on the dried initial solid. Due to their size and morphology, the microparticles have potential applications as reinforcement in adhesives, polymer composites, in the biomedical field, and even as a source of silica for fertilizers.
Recovery of acetate by anion exchange with consecutive CO2-expanded methanol desorption: A model-based approach
(Elsevier BV, 2018-04-07) Cabrera-Rodrígueza, Carlos I.; Cartin-Caballeroa, Carlos M.; Platarou, Evgenia; de Weerd, Florence A.; van der Wielena, Luuk A.M.; Straathof, Adrie J.J.
Production of bio-based acetate is commonly hindered by the high costs of the downstream processing. In this paper, a model is developed to describe a new method that recovers acetate salts using anion exchange resins, and subsequently desorbs and upgrades them using CO2-expanded alcohol. The model consists of equilibrium parameters for both the adsorption and desorption step. The calculated parameters are: for the adsorption − =− KCl 0.125 Ac , − = − K 0.206 Cl HCO3 and KOV HAc , = 0.674 mol / kgresin mol / kgsolution , and for the desorption − = − pK 3.71. MeCO Ac 3 The maximum experimental concentration of acetic acid obtained in CO2-expanded methanol is 0.427 mol/kg (20 g/ LMeOH) at an operating pressure of 31 bar. The model represents the expected trends for all species, and can be used to design a multicolumn system for the recovery and upgrading of carboxylates

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