Preparation of hydrogen peroxide by means of a cyclic anthraquinone process

摘要

The working solution is regenerated for re-use at the hydrogenation stage by treatment with sodium nitrate and sodium hydroxide. Preparation of hydrogen peroxide by the cyclic anthraquinone process comprises: (i) catalytic hydrogenation of an anthraquinone derivative dissolved in a working solution (WS) comprising polar and non-polar solvents; (ii) oxidation of the hydrogenated derivatives obtained by O2, air or any other O2-containing gas; (iii) extraction from the WS of the H2O2 obtained with demineralized water; (iv) regeneration of the WS, comprising washing with an aqueous alkaline saline solution (L); and (v) recycling of the regenerated WS for catalytic hydrogenation of the anthraquinone derivatives. The aqueous alkaline saline solution is an alkaline solution of sodium nitrate.