| 摘要 |
The invention relates to a process for the preparation of a substantially pure aqueous solution (10) of hydrogen peroxide. It is possible to use in the process an impure hydrogen peroxide solution (1) obtained from a hydrogen peroxide preparation process, such as the anthraquinone process, which solution is divided in a vaporizer (2) into a vapor (3, 7) containing hydrogen peroxide and a concentrated hydrogen peroxide solution (6), in equilibrium therewith, containing the impurities. Instead of vapor (3, 7) obtained from a condenser (2) it is possible to use a corresponding vapor obtained directly from the process for the preparation of hydrogen peroxide. According to the invention, a pure hydrogen peroxide solution (10) is obtained by a partial condensation of vapor (7), wherein there is formed, in addition to the solution, a residual vapor (11), in equilibrium therewith, having a lower hydrogen peroxide concentration and being capable of being condensed in a separate condenser (13). The concentration of the obtained hydrogen peroxide solution (10) can be regulated by means of the condensation efficiency of the partial condensation, for example so that a commercial 35 % hydrogen peroxide solution is obtained. <IMAGE> |
