Preparation method and application of working solution carrier for producing hydrogen peroxide by anthraquinone method

The invention discloses a preparation method and application of a working solution carrier for producing hydrogen peroxide by an anthraquinone process, the preparation method comprises the following steps: (1) adding a solvent and 4-methyl phthalic anhydride into a reactor, stirring and dissolving, and cooling to below 8 DEG C; (2) adding aluminum trichloride and alkylbenzene into the solution in the step (1), and reacting to obtain a reaction solution; (3) carrying out acidolysis on the reaction liquid obtained in the step (2), and layering to obtain a water phase and an organic phase containing an intermediate; (4) carrying out intermediate dehydration ring-closure reaction on the organic phase containing the intermediate obtained in the step (3) to obtain ring-closure reaction liquid; and (5) post-treating the ring-closure reaction liquid obtained in the step (4) to obtain the working solution carrier for producing hydrogen peroxide by the anthraquinone process, wherein the purity is greater than 99.6 wt%.