Melhoramento da cana-de-açúcar: X. Ensaio de clones provenientes de hibridações realizadas em 1981 e selecionados na região de Jaú (SP)

Campana, Mário Pércio; Silva, Marcelo de Almeida; Álvarez, R.; Landell, Marcos Guimarães de Andrade; Figueiredo, Pery; Bolonhezi, Denizart

doi:10.1590/s0006-87051995000200008

Cited by 2 publications

(1 citation statement)

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“…No entanto, novos cultivares de cana-de-açúcar necessitam ser constantemente desenvolvidos e implantados pela vida curta das variedades, suscetíveis à disseminação de doenças durante a propagação vegetativa e pela vulnerabilidade gênica das espécies, que aumenta caso o plantio seja feito em monocultura (POMMER e BASTOS, 1984;CAMPANA et al, 1995).…”

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Estudo cinético da cana-de-açúcar IACSP95-5000 mediante métodos isoconversionais e esquema de reações paralelas e independentes

Oliveira¹

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This study aims to determine the kinetic parameters of the pyrolysis reaction of the sugarcane IACSP95-5000 using thermogravimetry in order to evaluate the potential application in thermal processes. The raw material was cultivated in the Department of Biology of UNICAMP, ground in a knife mill and dried at 103ºC for 24 hours. After sieving, the particle diameter between 210-297 m was selected. The thermogravimetric analyses were carried out using four heating rates (5, 10, 15 and 20º C/min) in a nitrogen atmosphere. TG and DTG curve analysis allowed evaluating six temperature ranges: 150-400 °C, 170-440 °C, 180-380 °C, 180-400 °C, 180-420 °C and 190-430 °C in order to obtain the pyrolysis representation. Considering the single-step reaction model, the activation energy was obtained through the following isoconversional methods: Friedman (1964), Ozawa-Flynn-Wall (1965, 1966), Modified Coats-Redfern (1991 and Vyazovkin (1997). The best temperature range was 180-420 ºC and conversion range between 0.05 to 0.90 obtaining apparent activation energies of 163.72, 160.33, 159.17 and 159.87 kJ/mol, for each one of these methods, respectively. The most representative biomass decomposition model from Master Plots method was described by the n-order reaction models considering the mean activation energy of the Vyazovkin method. However, the 6 th order reaction model (F6), considering the conversion range of 0.05 to 0.75 for the latter temperature range chosen, represented the lowest average deviation and it was applied for the single step simulation. In the sequence, the linearization method was used to validate the activation energy (135.76 kJ/mol) obtained by the isoconversional methods and for obtaining the pre-exponential factor (2.53*10 11 1/s). These kinetic parameters were used to simulate the theoretical conversion and the conversion rates applying the single-step model, which presented an average deviation of 8.93-9.99% and 20.75-21.89%, respectively, between the heating rates. Thus, the independent parallel reaction scheme was applied considering the temperature range of 150-900 °C. The parameters obtained for the four main components (extractives, hemicellulose, cellulose and lignin) were: activation energy of 131.

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Section: Ligninaunclassified

Estudo cinético da cana-de-açúcar IACSP95-5000 mediante métodos isoconversionais e esquema de reações paralelas e independentes

Oliveira¹

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Evaluation agronomique de variétés de canne à sucre en début de campagne de récolte à Ferké au Nord de la Côte d’Ivoire : vers un allègement du schéma de sélection

Kouame¹,

Péné²,

Michel³

et al. 2010

Agronomie Africaine

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Melhoramento da cana-de-açúcar: X. Ensaio de clones provenientes de hibridações realizadas em 1981 e selecionados na região de Jaú (SP)

Cited by 2 publications

References 2 publications

Estudo cinético da cana-de-açúcar IACSP95-5000 mediante métodos isoconversionais e esquema de reações paralelas e independentes

Estudo cinético da cana-de-açúcar IACSP95-5000 mediante métodos isoconversionais e esquema de reações paralelas e independentes

Evaluation agronomique de variétés de canne à sucre en début de campagne de récolte à Ferké au Nord de la Côte d’Ivoire : vers un allègement du schéma de sélection

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