An original ultrasonic reaction with dual coaxial frequencies for biomass processing

•Simultaneous dual frequency ultrasonic reactor.•Valorisation of an industrial biowaste into platform molecules.•Low and high frequencies irradiation.•Coaxial and identical direction irradiation.

An advanced dual frequency ultrasonic coaxial reactor enabling simultaneously low and high frequencies irradiating in the same direction was developed to focus both mechanical and chemical effects on a concentrated area. The prototype was straightforward employed for the conversion of a starch-based industrial waste into sugars.