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Cellulosic Ethanol from Sugarcane Straw: a Discussion Based on Industrial Experience in the Northeast of Brazil Pollyanna Ximenes Oliveira Bezerra 1,2 & Carlos Eduardo De Farias Silva 2 Sandra Helena Vieira de Carvalho 2

&

João Inácio Soletti 2 &

Received: 10 February 2020 / Accepted: 20 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract Second-generation technology (2G) is currently the industrial route that is being developed with the potential to meet the demand for biofuels and bioproducts. The technology studied in the present work is based on the non-food processing of sugarcane straw, which is unlike the bagasse processing route (a lignocellulosic residue) that is commonly used in boilers for steam and electricity generation. In the last years, cellulosic ethanol plants worldwide include the utilisation of corn stover, sugarcane bagasse, wood waste and plant residues. Therefore, a communication based on industrial aspects using sugarcane straw is important in order to expand the knowledge regarding this promising technology. The main objective of this work included listing the results obtained in a cellulosic-ethanol production industry using sugarcane straw, located in the Northeast region of Brazil and taking into account the efficiency of pre-treatment, enzymatic hydrolysis and fermentation processes and comparing these results with data found in the literature regarding studies with similar efficiency. It was possible to observe that the production of ethanol from sugarcane straw at an industrial scale achieved a productivity of 200 l of ethanol per tonne of biomass, exhibiting 90, 70 and 85% of pre-treatment, hydrolysis and fermentation efficiency, respectively. Keywords Biofuels . Bioproducts . Second generation . 2G ethanol

Introduction Second-generation (2G) technology is currently the industrial route developed with the potential to meet the demand for renewable energy and bioproducts. This technology is based on non-food biomasses for sugar and lignin extraction [1, 2]. The worldwide production of ethanol has almost doubled in the past decade, with a production of over a 100 million cubic metres a year, being a sign of the great dependency on this source of energy at a global scale. The drawback of expanding this production is related to the limitation regarding the use of soils, as well as the competition with other raw materials used in the food industry (sucrose and starch, for instance), the changes in oil prices and the difficulties in scaling-up the promising second generation route [1, 3]. * Pollyanna Ximenes Oliveira Bezerra [email protected] 1

Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco, Recife, Pernambuco, Brazil

2

Centro de Tecnologia, Universidade Federal de Alagoas, Maceió, Alagoas, Brazil

It is also important to point out that the production of bioethanol based on this type of biomass can be divided into four different generations: the first generation includes biofuels produced from saccharide and starch feedstock (s