| 摘要 |
Hydrogen peroxide is produced from a reducible-oxidizable polymer having anthraquinone groups by cyclically reducing and then oxidizing the polymer by means of air or oxygen in the presence of a solvent for hydrogen peroxide. Specified polymers are polyvinyl anthraquinones, polyanthraquinonyl - methylene-malonates of linear polyalcohols having alcohol groups at each end, and acetals of formyl-2-anthraquinones and polyvinyl alcohols or acetates (see Specifications 965,676 and 965,677). They are preferably in the form of spheres, plates or strips and are reduced catalytically, e.g. palladium on alumina, or by aqueous reducing agents, e.g. titanium trichloride in hydrochloric acid, and sodium hydrosulphite. The re-oxidation may be achieved in the presence of a hydrogen peroxide stabilizer, e.g. sodium metaphosphate. An apparatus is described in which the polymer is held in a vertical tube through the top of which is introduced, in an inert atmosphere, the aqueous reducing agent. The resin is washed in an ascending current of water and air or oxygen is then blown up through the tube. The hydrogen peroxide is recovered as an aqueous solution by washing the resin. The reactions may also be effected on the polymers dissolved in a solvent, e.g. dimethyl formamide for catalytic hydrogenation, either alone or with aqueous alkali. After oxidation, the resin precipitates on dilution with water. |
