The new catalyst has been in use for almost two months, but the system is still not working properly. What should be done?
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It’s been almost 2 months since the newly installed catalyst was put into use, yet the system still isn’t functioning properly: the circulation rate is insufficient, and the hydrogen efficiency cannot be increased (it’s less than 5 g/l). The activated clay bed has been replaced twice already – what should be done next? Should we switch to the old catalyst and regenerate the new one?
It causes catalyst poisoning upon entering the hydrogenation step, and reduces the oxidation yield as well as increases side reactions; when a large amount of... is used, the alkalinity behind the alumina bed (clay bed) reaches 3.9 grams per liter, which is hundreds of times higher than the normal operating limits.
Under palladium catalysis, 2-ethylanthraquinone is reduced by H2 to 2-ethylhydroanthraquinone: