Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/34254
metadata.artigo.dc.title: Enzymatic production of cellulose nanofibers and sugars in a stirred-tank reactor: determination of impeller speed, power consumption, and rheological behavior
metadata.artigo.dc.creator: Bondancia, Thalita J.
Corrêa, Luciano J.
Cruz, Antonio J. G.
Badino, Alberto C.
Mattoso, Luiz Henrique C.
Marconcini, José Manoel
Farinas, Cristiane S.
metadata.artigo.dc.subject: Nanocellulose
Cellulose nanofiber
Cellulosic ethanol
Biorefinery
Enzymatic hydrolysis
Scale-up parameters
metadata.artigo.dc.publisher: Springer
metadata.artigo.dc.date.issued: Aug-2018
metadata.artigo.dc.identifier.citation: BONDANCIA, T. J. et al. Enzymatic production of cellulose nanofibers and sugars in a stirred-tank reactor: determination of impeller speed, power consumption, and rheological behavior. Cellulose, [S.l.], v. 25, n. 8, p. 4499–4511, Aug. 2018.
metadata.artigo.dc.description.abstract: An integrated biorefinery process is proposed here for the enzymatic production of cellulose nanofiber (CNF) and sugars in a stirred-tank reactor using eucalyptus cellulose pulp as feedstock. Process engineering variables required for scale-up such as impeller speed, power consumption, and rheological behavior were determined under different experimental conditions of solids loading (10 and 15% w/v) and enzyme dosage (5 and 10 mg/g). Based on the mixing time, an impeller speed rotation of 470 rpm was selected for provision of adequate homogenization of the medium. Total energy consumption ranged from 161 to 207 W h and showed that significantly lower power consumption could be achieved using 10 mg/g enzyme loading with 10% w/v solids. Evaluation of rheological behavior showed that transition to a turbulent flow regime during the enzymatic hydrolysis reaction resulted in a constant power number ranging from 2.06 to 2.51, which was also lower for 10 mg/g enzyme loading with 10% w/v solids. Integrated analysis of glucose released and CNF generated after enzymatic hydrolysis showed that glucose values varied from 42.0 to 90.6 g/L, corresponding to cellulose conversion ranging from 57.2 to 76.4%. These values are suitable for the microbial fermentation of sugars into biofuels, while leaving a useful amount of residual nanomaterial. The residual solids of the enzymatic reactions presented the characteristics of CNF, as shown by X-ray diffraction (XRD) analyses, with crystallinity index (CI) values of 72–81%, as well as by morphological analysis using field emission scanning electron microscopy (FEG-SEM), which revealed diameters in the range 18–31 nm, making this nanomaterial suitable for use in a wide range of industrial applications. The findings indicated the potential of using conventional stirred-tank reactors for enzymatic hydrolysis for the integrated production of CNF and glucose, hence contributing to the implementation of future large-scale biorefineries.
metadata.artigo.dc.identifier.uri: https://link.springer.com/article/10.1007/s10570-018-1876-2
http://repositorio.ufla.br/jspui/handle/1/34254
metadata.artigo.dc.language: en_US
Appears in Collections:DEG - Artigos publicados em periódicos

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.