Abstract
This paper main objective is to determinate the hydrolysis efficiency by using four different diluted acids treatment: (H 2 SO 4 ) sulfuric, (HNO 3 ) nitric, phosphoric (H 3 PO 4 ) and acetic (CH 3 COOH), in attempt to improve the fibers and bioethanol production levels. In this study twelve Brazilian woods were investigated, including native and exotic species, hardwoods and softwoods. Processes to use wood waste recovery established to produce ethanol and cellulosic fibers simultaneously were carried out. For fermentation essay, a wild line of Saccharomyces cerevisiae yeast was investigated. The incomes related to hydrolysis efficiency, ethanol yields, fibrous fractions efficiency, and plus glucose and delignification levels using acid and alkaline treatments were tested. From the results it is possible to join the production of ethanol and cellulosic fibers simultaneously using wood chips, and due to the complexity of the analyzed material it´s still possible to isolate byproducts. Also from results, the yeast demonstrated to be efficient with an estimate maximum production of 12,94 liters per 100 kg of biomass using Balfourodendron riedelianum specimen and sulfuric acid hydrolysis. All acids and samples demonstrated high and similar efficiency in hydrolysis, indicating that these are feasible for hydrolysis processes use.
Highlights
There is a considerable potential to modernize the use of biomass to produce fuels and convenient energy vectors such as electricity, while the traditional uses of biomass is still preserved.When produced in sufficient and sustainable ways, energy from biomass brings many environmental and social benefits if compared to other fossil fuels
The objective of this study is to investigate the hydrolysis yields using different mineral acids: sulfuric, nitric, phosphoric, and acetic, in order to discover which hydrolysis process is more advantageous for Brazilian woods
3.1 Delignification and fibers efficiency Lignin is one of the major content in lignocellulosic materials; the amount of produced lignin by the industry could be greater according to Oliet et al, (2001)
Summary
When produced in sufficient and sustainable ways, energy from biomass brings many environmental and social benefits if compared to other fossil fuels. Some geopolitical factors related to the security of oil supply, high prices and serious environmental concerns, like global warming, are essential to the sustainability through alternative fuels such as bioethanol (COPPOLA et al, 2009). The development of new technologies for treatment of the lignocellulosic materials for ethanol production is well regarded by the world, both economically and environmentally, as compared to fossil fuels production. Ethanol is one of the most important alternative fuels which can be obtained through the fermentation of sugars using a biological catalyst, such as yeast. In an attempt to minimize the production costs, the use of cellulosic materials, which includes agro-industrial residues and wood wastes, appears as important source of carbohydrates for biomass fermentations (SUN, 2002; CHENG, 2004)
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