The two-step process for obtaining efficient solvents for cellulose – N-methylmorpholine-N-oxide (MM) was investigated. The first stage is preparation of N-methylmorpholine (MM) by the reaction of morpholine (M) with formaldehyde (F) and formic acid (FA) taken in mole ratios: M:F:FA =1.0:14:1.25, reaction temperature 80–90⁰C, the reaction time is 4–5 hours. The second step – the oxidation of the MM with H₂O₂ , molar ratio H₂O₂:MM = 1.4:1.0, reaction temperature 65–75⁰C, the reaction time of 6 hours. The possibilities of increasing the yield of the MMO at lower temperatures and contact times by direct aerobic oxidation by atmospheric oxygen MM or conducting of the oxidation process of  the MM in the presence of ions Fe³⁺ (≥ 10^-4 wt.%) are shown