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Corrosive properties of liquid fractions issued from lignocellulosic biomass pretreatment with imidazolium-based ionic liquids : towards a scale up of biorefinery strategy

Abstract : One of the main challenges of the 21st century is to meet the increasing demand for energy requirements by means of a more sustainable energy supply. The use of ionic liquids (ILs) in the lignocellulosic biomass pretreatment necessary to 2nd generation bioethanol production has gained considerable attention in recent years[1],[2]. Indeed ILs present several advantages including high thermal stability and low volatility, which distinguish them from conventional instable and toxic pretreatments, operating at severe conditions[3],[4]. Owing to an imminent scale-up phase, it is necessary to anticipate future problems which could be encountered at industrial scale. Since the annual direct cost of corrosion worldwide is over 3% of the world's Gross Domestic Product[5], prevention and reduction of corrosion in biorefineries of the future is of great scientific and technological interest and of upmost economic importance. However very few reports concerning the evaluation of corrosion due to ILs in biorefineries are available. Consequently the purpose of the present work was to study the corrosive properties of liquid fractions issued from lignocellulosic biomass valorization into second generation bioethanol after each step of the process: pretreatment with imidazolium-derived ILs (2% w/v biomass-IL, 110°C, 40 min), cellulose regeneration, enzymatic saccharification to release fermentable sugars and alcoholic microbial fermentation. Two industrial metals were tested using mass loss techniques: S235 carbon steel and 316L stainless steel. Corrosion rates measured on 316L stainless steel after 7 days at 100°C were found negligible (below 1 μm/year) whereas rates for S235 carbon steel tested under identical conditions, varied until 400 μm/year depending on the nature of the liquid fraction. Our results indicated that IL anionic moiety played an important role in the IL corrosive properties, as EmimMethylphosphonate (31-390 μm/year) was more corrosive than EmimAcetate (0-100 μm/year), depending on liquid fraction nature. Lignocellulosic biomass components dissolved on ILs after pretreatment did not increase the corrosive power. In contrast, the addition of an anti-solvent (water or ethanol) for the regeneration step seemed to increase the corrosion. Both enzymatic saccharification and microbial fermentation steps did not influence significantly the corrosive properties of the liquid fractions.
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Submitted on : Tuesday, August 7, 2018 - 2:23:56 PM
Last modification on : Wednesday, August 8, 2018 - 1:08:08 AM

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Ingrid Murrieta-Pazos, Guy Marlair, Wassila Benaissa, Maurice Nonus, Christophe Len, et al.. Corrosive properties of liquid fractions issued from lignocellulosic biomass pretreatment with imidazolium-based ionic liquids : towards a scale up of biorefinery strategy. IberoAmerican meeting on ionic liquids (IMIL 2015), Jul 2015, Madrid, Spain. ⟨ineris-01855090⟩

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