Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

Pontes, Rita; Romaní, Aloia; Michelin, Michele; Domingues, Lucı́lia; Teixeira, J. A.

doi:10.1016/j.renene.2018.05.055

Cited by 33 publications

(15 citation statements)

References 40 publications

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“…The higher heating values (HHVs) of crude olive pomace, liquid and pulp fraction samples were measured by an automatic adiabatic bomb calorimeter (Parr calorimeter Type 6200). Measurements were made in duplicate (1 g of sample) according to EN 14918 and following Reference [34]. The samples of crude olive pomace and its pulp fraction were compacted in pellets before analysis, to prevent the occurrence of uncontrolled combustion.…”

Section: Energy Potentialmentioning

confidence: 99%

Total and Sustainable Valorisation of Olive Pomace Using a Fractionation Approach

et al. 2020

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Olive pomace management represents a great concern to the olive oil industry. This work focused on the development of a “zero waste” strategy for olive pomace based on a fractionation approach resulting in the obtention of different value-added fractions. The physicochemical composition of edible fractions obtained (liquid and pulp) was analysed. The potential use as a solid biofuel of the non-edible fraction (stones) was evaluated. High amounts of hydroxytyrosol (513.61–625.76 mg/100 g dry weight) were present in the liquid fraction. Pulp fraction was demonstrated to be a good source of fibre (53–59% dry weight) with considerable antioxidant activity both from free and bound phenolics. The stones fraction exhibited substantial high heating values (18.65–18.94 megajoule (MJ/kg). All these results support the added value of the olive pomace fractions combining the biofuel potential from the stones fraction and the functional food ingredients’ potential both from liquid and pulp fractions. The present methodology seems to be a feasible whole valorisation approach to achieve the circularity in the olive oil sector, prioritising obtaining high over low added-value products.

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Section: Energy Potentialmentioning

confidence: 99%

Total and Sustainable Valorisation of Olive Pomace Using a Fractionation Approach

et al. 2020

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“…Thus, autohydrolysis reduced the activation energy of the energyproduction process and removed most of the hemicellulose fraction (i.e., the lowest-energy fraction), thereby facilitating burning or, in our case, pyrolysis to obtain hydrogen. Changes in activation energy and the kinetics of combustion or pyrolysis can be influenced by the extraction conditions used in the autohydrolysis process [46].…”

Section: Tga Analysis Of the Pyrolysis Processmentioning

confidence: 99%

Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

Loaiza

Palma

Díaz

et al. 2020

Biomass Conv. Bioref.

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Ensuring environmental and social-economic sustainability in the use of materials from lignocellulosic biomass requires their fractionation and valorization of their main components. In this work, we used Eucalyptus urograndis wood to obtain chemicals and energy. The raw material was characterized in chemical terms and then subjected to autohydrolysis under variable operating conditions to optimize the extraction of hemicellulose derivatives relative to cellulose. The kinetics of the pyrolysis process was modeled in terms of activation energy and hydrogen production. Using temperatures in the range of 180-190°C and treatment times in the range of 15-30 min allowed more than 74.5% of all hemicellulosic components in the raw material to be selectively extracted into the liquid post-hydrolysis phase, more than 90% of all glucan to remain in the solid phase and up to 27.8% of lignin to be removed. The thermal behavior of solid fraction was examined by thermogravimetric analysis, using variable heating rates under a nitrogen atmosphere, and the activation energy can be estimated by using the Flynn-Wall-Ozawa method. Based on the results, the pyrolysis of E. urograndis can be modeled as a first-order reaction. The activation energy (E a) at a fractional conversion α between 0.3 and 0.7 was 183 to 199 KJ mol −1 for the raw material, whereas that for the solid residue from autohydrolysis ranged from 179 to 186 kJ mol −1 at same fractional conversion when operational temperature in autohydrolysis was upper 185°C. Based on the results, using temperatures above 180°C and times of 15 min or longer [i.e., operating at the (0,0) experimental point for the autohydrolysis process] in combination with degrees of conversion from 0.3 to 0.8 reduced the activation energy of the pyrolysis process in relation to the raw material by up to 12% and removed hemicellulose by more 74.5% from it. In parallel, the comparative analysis of the E a values and the composition of the pyrolysis gas obtained showed a negative relationship between E a and the amount of hydrogen produced.

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“…Despite all the research conducted so far on converting lignocellulosic materials, these processes generally still cannot compete with their counterparts from the petrochemical industry [11]. Aiming to reduce the cost associated to the lignocellulosic material, new and less expensive options have been studied, ranging from industrial [12], agro [13] or forest residues [14], to municipal wastes [15]. In the particular context of the Portuguese economy, the pulp and paper industry, which is one of the largest in this sector, is mostly based on Eucalyptus globulus wood [16].…”

Section: Introductionmentioning

confidence: 99%

Co-production of biofuels and value-added compounds from industrial Eucalyptus globulus bark residues using hydrothermal treatment

Gomes

Michelin

Romaní

et al. 2021

Fuel

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In this work, hydrothermal treatment was assessed for the fractionation of industrial Eucalyptus globulus bark residue (EBR) to obtain biofuels and value-added compounds (such as oligosaccharides and phenolic compounds) in separated streams. Hydrothermal treatment was evaluated under non-isothermal regimen in the range of maximum temperature (T max) of 177-228 • C or severities (S 0) between 2.76 and 4.25. The highest oligosaccharides concentration (17.5 g/L) was achieved at S 0 of 3.69, corresponding to hemicellulose recovery of 77.30%. Under all severities evaluated in this work, over 90.94% and 84.17% of cellulose and lignin remained in the solid phase, respectively. The increase of S 0 improved 4.38-fold the enzymatic saccharification of cellulose, the highest glucose yield (84%) being achieved at S 0 of 4.04. Considering the maximal recovery of polysaccharides as glucose and oligosaccharides from the liquid and solid phases, S 0 of 4.04 was selected for bioethanol production using high solid loadings and following different strategies (simultaneous saccharification and fermentation-SSF and pre-saccharification and simultaneous saccharification and fermentation-PSSF). The utilization of 15% hydrothermally pretreated EBR without nutrient supplementation resulted in 26 g/L of ethanol, independently of the strategy used. An increase up to 17.5% solids and employing nutrient supplementation enabled the production of 38 g/L (or 4.8% v/v) of ethanol by PSSF.

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Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

Cited by 33 publications

References 40 publications

Total and Sustainable Valorisation of Olive Pomace Using a Fractionation Approach

Total and Sustainable Valorisation of Olive Pomace Using a Fractionation Approach

Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

Co-production of biofuels and value-added compounds from industrial Eucalyptus globulus bark residues using hydrothermal treatment

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