Procedure for cleaning filter used in production of hydrogen peroxide from anthraquinone
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United States of America Patent
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Jun 8, 1993
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N/A
app pub date -
Sep 10, 1991
filing date -
Sep 10, 1991
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Expired
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Abstract
The present invention relates to a procedure for cleaning a sinter used for filtering a metal catalyst suspension. As taught by the invention, the sinter is treated with an aqueous solution of hydrogen peroxide for displacing the metal catalyst left in the pores of the sinter with the aid of the gas produced by the decomposition of the hydrogen peroxide, caused by the metal catalyst, until gas formation ceases, indicating that no significant quantities of metal catalysts are left in the sinter. Such hydrogen peroxide decomposition is produced by the so-called anthraquinone process, in which an anthraquinone derivative is dissolved in an organic solvent then reduced with the aid of hydrogen gas in the presence of a catalyst to the corresponding anthraquinone derivative; the catalyst is then separated from such solution by filtering. Then, such corresponding anthraquinone derivative is oxidized with air or oxygen, whereby it reverses to the state preceding hydrogenation, i.e., to the original anthrquinone derivative, while at the same time producing hydrogen peroxide.
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