Energy Balance for Ethyl Alcohol Production from Crops

Silva, José Gomes da; Serra, Ginalber Luiz de Oliveira; Moreira, José Roberto; Conçalves, José Carlos; Goldemberg, José

doi:10.1126/science.201.4359.903

Cited by 119 publications

(30 citation statements)

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“…6,10 Outra rota importante para a utilização de biomassa no Brasil é o biodiesel. Biodiesel é produzido a partir de óleos vegetais (tais como soja, canola, dendê ou jatrofa) pela transesterificação com metanol e um catalisador (em geral hidróxido de sódio ou potássio).…”

Section: Figuraunclassified

Current and Prospects in the Use of Biomass for Energy Generation

Goldemberg¹

2017

Rev. Virtual Quim.

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Abstract:The o t i utio of io ass to o ld's e e g p odu tio is p ese ted as well as the current technologies in use 1 st generation for the production of ethanol and biodiesel. Second generation technologies for the production of cellulosic ethanol as well as gasification are discussed as well as the scientific and technical challenges they are facing.Keywords: Fuel; ethanol; biodiesel; cellulose. ResumoA contribuição da biomassa na produção de energia é apresentada bem como as tecnologias correntes (1ª geração) em uso para a produção de etanol e biodiesel. São discutidas as tecnologias de 2ª geração para a produção de etanol celulósico e gasificação bem como os desafios científicos e tecnologias que elas enfrentam.

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Section: Figuraunclassified

Current and Prospects in the Use of Biomass for Energy Generation

Goldemberg¹

2017

Rev. Virtual Quim.

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“…Para a mão-de-obra dessas operações adotou-se o índice de 1,2 MJ h -1 , sendo a jornada de trabalho de 8 horas (Carmo & Comitre, 1988) e, para o material de propagação da mandioca utilizou-se o valor de 494,0 MJ ha -1, determinado por Silva & Serra (1978).…”

Section: íNdices Energéticosunclassified

Análise energética de sistemas de produção de etanol de mandioca (Manihot esculenta Crantz)

Salla¹,

Furlaneto²,

Cabello

et al. 2010

Rev. bras. eng. agríc. ambient.

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RESUMOBuscou-se, com este trabalho, analisar energeticamente o sistema de produção de etanol utilizando como fonte de carboidratos, a mandioca. As pesquisas de campo foram realizadas na região do Médio Paranapanema, Estado de São Paulo, no período de janeiro a dezembro de 2007. Avaliou-se o consumo energético referente às fases de produção e processamento industrial e se verificou que o custo energético total da produção agrícola correspondeu a 9.528,33 MJ ha -1 , sendo que o item mais oneroso foi o de insumos (35,72%). Nas etapas industriais o consumo energético foi equivalente a 2.208,28 MJ t -1 . As operações de hidrólise/sacarificação/tratamento do caldo representaram 56,72% do dispêndio energético total. A mandioca apresentou um custo energético de 1,54 MJ L -1 em relação ao etanol produzido nas principais operações agronômicas de produção e 11,76 MJ L -1 nas etapas de processamento industrial. A eficiência energética observada no cultivo e industrialização da mandioca foi de 1,76.Palavras-chave: sustentabilidade ambiental, energia renovável, produção agrícola, processamento industrial, carboidrato Energetic analysis of the ethanol production systems of cassava (Manihot esculenta Crantz) ABSTRACTThis work aimed to analyze the energetic consumption of the etanol production system, using the cassava as carbohidrates source. The researches were carried out from the field in the mid region of Paranapanema river, Sao Paulo state, during the period January to December, 2007. The energy consumption referring to the phases of crop production and industrial processing were appraised. It was verified that the total energetic cost of the crop production corresponded to 9,528.33 MJ ha -1 , and the most onerous item was the inputs (35.72%). In the industrial step, the energetic consumption was equivalent to 2,208.28 MJ t -1 . The operations of hydrolysis/saccharification/ treatment of the juice represented 56.72% of the total energetic expenditure. The cassava crop presented an energetic cost of 1.54 MJ L -1 in relation to the etanol produced in the main agronomic operations crop production, and 11.76 MJ L -1 in the industrial processing. The energy efficiency observed in the cultivation and industrialization of the cassava was of 1.76.

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“…The major governmental program developed has been the so called PROALCOOL project, which is based on ethanol production for motor vehicles and chemical feed stocks for industries from sugar cane juice fermentation (Goldemberg, 1978;Ministerio de Minas e Energia, 1979;Filgueiras, 1980). Although part of the residue generated (bagasse) is burnt to supply energy for the fermentation and distillation processes or for the cogeneration of electricity, a large excess of bagasse still remains.…”

Section: Lancas and Peresmentioning

confidence: 99%

Upgrading of Sugar Cane Bagasse by Thermal Processes. 7. Catalytic Liquefaction in Monoethanolamine (Mea) and Preliminary Fractionation of the Obtained Products

Lanças

Peres

1996

Fuel Science and Technology International

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The liquefaction of sugar cane bagasse in monoethanolamine (MEA) in the presence of catalysts (zeolite A, non-zeolitic aluminosilicate and zinc chloride) as well as in the absence of catalysts is described in this paper. The influence of the catalysts on the yield of the generated products is verified through a fractionation method based on relative solubility parameters. The influence of the catalysts on the conversion yield was also verified. The catalysts that yields the greater quantity of oils is the non-zeolitic aluminosilicate. However, in the overall conversion process of sugar cane bagasse, the most efficient catalyst was found to be zeolite A. 963

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Energy Balance for Ethyl Alcohol Production from Crops

Cited by 119 publications

References 1 publication

Current and Prospects in the Use of Biomass for Energy Generation

Current and Prospects in the Use of Biomass for Energy Generation

Análise energética de sistemas de produção de etanol de mandioca (Manihot esculenta Crantz)

Upgrading of Sugar Cane Bagasse by Thermal Processes. 7. Catalytic Liquefaction in Monoethanolamine (Mea) and Preliminary Fractionation of the Obtained Products

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