Microwave hydrothermal treatment (MHT), a novel advanced technology, was proposed for the fractionation of Paulownia wood (PW) at temperatures ranging 200–230 °C and residence times 0–50 min, corresponding to severities 2.93–4.70. This procedure allowed 80% xylan recovery as xylooligosaccharides an average 95% cellulose in pretreated PW biomass, showing selectivity treatment, that also compared...