Effects of experimental conditions and of addition of natural minerals on syngas production from lignin by oxy-gasification: Comparison of bench- and pilot scale gasification

•Oxygen blown gasification of spent lignin from a second-generation cellulosic ethanol plant.•Oxy-gasification of a biomass fraction (lignin) with high tendency for tar formation.•Oxy-gasification of a biomass fraction with high contents of silica and alkaline metals.•Confirmation of bench-scale oxy-gasification results at pilot-scale.•Hot syngas cleaning and upgrading in a two fixed bed catalytic reactors installation.