Study of the specific heat capacity of biomass from banana waste for application in the second‐generation ethanol industry

Vélez, Harvey Alexander Villa; Váquiro, Henry Alexander; Lopes-Filho, José Francisco; Telis, Vânia Regina Nicoletti; Telis‐Romero, Javier

doi:10.1002/ep.12090

Cited by 8 publications

(5 citation statements)

References 44 publications

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“…The experimental mean values of the specific heat measured varied from 3,830.0 to 4,142.6 JÁkg −1 ÁK −1 , as shown in Table 4. These results are in agreement with the data reported for acidified suspensions containing powdered peanut shells 18 and banana flower-stalk, 37 which were also determined by differential scanning calorimetry.…”

Section: Specific Heat (C P )supporting

confidence: 92%

Thermophysical properties of dilute acid slurries of cassava bagasse as a function of biomass loading, acid concentration, and temperature

Polachini

Mulet

Cárcel

et al. 2020

Env Prog and Sustain Energy

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For suitable design of equipment and process optimization, the determination of thermophysical properties of the raw materials is necessary. Therefore, this work was aimed at determining and modeling the density, specific heat, thermal diffusivity, and thermal conductivity of acid slurries of cassava bagasse used during its conversion into bioethanol. Experimental measurements were carried out in slurries with different mass fractions of cassava bagasse (0.00 to 0.10) and phosphoric acid (0.00 to 0.10) at temperatures from 278.13 to 318.13 K. Results obtained show that density varied from 986.5 to 1,029.3 kg∙m−3, specific heat from 3,830.0 to 4,142.6 J∙kg−1∙K−1, thermal diffusivity from 0.9624 × 10−7 to 1.5249 × 10−7 m2∙s−1 and thermal conductivity from 0.3825 to 0.6212 W∙m−1∙K−1. While density increased with increasing solids and acid content at decreasing temperature, the thermal properties decreased at higher solids and acid content and increased when heating the slurries. The values were well‐fitted to polynomial models with good accuracy (R2 > 0.921 and MRE < 1.75%), allowing the application of the models to obtain reliable and ready‐to‐use data for cassava bagasse processing. Thus, the data reported in this study can be used for designing and managing momentum, heat and mass transfer processes for enhancing bioethanol production from cassava bagasse.

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Section: Specific Heat (C P )supporting

confidence: 92%

Thermophysical properties of dilute acid slurries of cassava bagasse as a function of biomass loading, acid concentration, and temperature

Polachini

Mulet

Cárcel

et al. 2020

Env Prog and Sustain Energy

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“…In this work, a c p model from the experimental results published by Villa-Vélez et al [41] was used as a function of the biomass concentration, pH, and temperature. The model represented by Eq.…”

Section: Specific Heat Capacity Correlation C Pmentioning

confidence: 99%

Identification of acoustic fields in aqueous biomass solutions of banana waste pretreated by power ultrasound

Vélez

Cornélio

Corrêa

et al. 2017

Biomass Conv. Bioref.

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High-intensity ultrasound is a technology used to improve the performance of processes in the chemical, pharmaceutical, biomass pretreatment, and food industries. However, few studies were described in the literature to comprehend the acoustic wave propagation in the material and their efficiency in the process. Thus, this study aims to determine the acoustic fields of aqueous biomass solutions from flower stalk banana using the calorimetric method and a determined sonotrode position. These tests were conducted at temperatures from 0 to 60°C and ultrasound power from 120, 160, to 320 W. Also, the specific heat capacity and density of the solution were determined experimentally as a function of the solution concentration (0.040 to 0.100 g biomass mL −1), pH (3, 5, and 7), and temperature. The position of the thermocouple was maintained at 1 cm from the sonotrode, and the ultrasound frequency was 24 kHz. The methods and results presented in this study can be used to reproduce acoustic field calculations in aqueous biomass solutions, aiming the construction of acoustic processor systems.

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“…The specific heat of the suspensions was determined as a function of solids concentration (0 12%), temperature (274.13 333.13 K) and pH ( 3 7), showing values in the range of 3537.0 to 4190.6 J·kg -1 ·K -1 (Table 5.5.1).These results were similar to those reported for acidified aqueous solutions with added flower stalk biomass (Villa-Vélez et al, 2015a), where a direct relationship of c p with biomass concentration and temperature was observed. In fact, the c p of ASPPS showed a linear dependence on pH and temperature, while a quadratic dependence on solids concentration (p value < 0.05) was observed.…”

Section: Specific Heat and Mathematical Modelingsupporting

confidence: 81%

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Polachini¹

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ACKNOWLEDGMENTSThis study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001. This study was also financed by CAPES to develop part of this PhD thesis in Spain under the grant number 88881.132626/2016-01. Thanks to the São Paulo Research Foundation (FAPESP) (Grant number 2017/06518-2) for their financial support to develop this project.At first, I would like to thank the Universitat Politècnica de València (UPV) and ASPA de amido) e no comportamento reológico (maior viscosidade) das suspensões prétratadas na presença de ultrassom. O campo acústico produzido nas suspensões sofreu uma redução durante a hidrólise, possivelmente devido às referidas alterações. Assim, pode-se concluir que o ultrassom de alta intensidade é uma tecnologia interessante para intensificar os pré-tratamentos de resíduos da agroindústria para a produção de bioetanol.Palavras-chave: Biomassa. Propriedades físicas. Campos acústicos. Hidrólise.Cinética. ABSTRACTThe pre-treatment of agroindustrial wastes is one of the most complex steps of their conversion process into bioethanol. This step consists basically of applying physical or chemical treatments in biomass in order to obtain carbohydrates partially hydrolyzed and more accessible for future action of enzymes and microorganisms. In this sense, the use of high-intensity ultrasound has been shown as a technology with an interesting potential, in combination with conventional methods, to enhance the mass and energy transfer processes. In the present study, it was characterized agroindustrial residues such as cassava bagasse, peanut shells and artichoke residues as potential materials for the production of bioethanol after acid pretreatment with and without the application of ultrasound. Thus, the different biomass/acid solutions systems were characterized according to their thermophysical properties (density, specific heat, thermal diffusivity and thermal conductivity) and rheological behavior. The acoustic fields generated in these different systems during ultrasound application were also characterized by a calorimetric method. Then, the ultrasonic intensity obtained in each case was related to the termophysical and reological properties. Subsequently, the kinetics of reducing and total sugar release and the structural changes produced in the suspensions considered during the pretreatments in acid solutions with conventional agitation or assisted by ultrasound were determined. The results obtained indicated that suspensions with higher acid concentration and higher solids content showed lower heat transfer capacity, given by the higher values for specific heat, thermal diffusivity, thermal conductivity. The same suspensions presented higher values of density and viscosity, which leads to greater resistance to flow. This fact was attributed, not only to the high viscosity, but also to the appearance of non-Newtonian rheological behavior as showed by the fitting of Herschel-Bulkley model. In these cases, the suspensions cont...

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Study of the specific heat capacity of biomass from banana waste for application in the second‐generation ethanol industry

Cited by 8 publications

References 44 publications

Thermophysical properties of dilute acid slurries of cassava bagasse as a function of biomass loading, acid concentration, and temperature

Thermophysical properties of dilute acid slurries of cassava bagasse as a function of biomass loading, acid concentration, and temperature

Identification of acoustic fields in aqueous biomass solutions of banana waste pretreated by power ultrasound

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

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