Wheat straw fractionation by ethanol-water mixture: Optimization of operating conditions and comparison with diluted sulfuric acid pre-treatment.

•Operating conditions of wheat straw fractionation with ethanol-water are optimized.•Ethanol-water fractionation yield on glucose is mainly affected by temperature.•Ethanol-water pre-treatment of wheat straw is very efficient in terms of energy.•Classic diluted acid pretreatment is less efficient than ethanol-water pretreatment.