Sumitomo Chemical Company, Limited

Toshikazu Ohmae

Shigefumi Tokumasu

Hideo Ohki

Junpei Tsuji

A process for regenerating a solid catalyst which has been used for producing propylene oxide through an epoxidation reaction of propylene with an organic peroxide in a reactor packed with the solid catalyst, which comprises allowing a liquid to flow through the catalyst packed in the reactor at a temperature not lower than the maximum reaction temperature of the epoxidation reaction. According to the present invention, a catalyst can be regenerated with extremely high efficiency without taking the catalyst to be regenerated out of the reactor.

Method for regenerating solid catalyst

A process for producing 1,3-di-(2-hydroperoxy-2-propyl)benzene comprising an oxidizing step, an extracting step with an aqueous solution and a recycling step wherein the accumulated equilibrium concentration of 1,3-di-(2-hydroxy-2-propyl)benzene in the circulating oil obtained by an extracting step with an aqueous solution is 4.2% by weight or less. The process enables to avoid inconveniences like occlusion of inside space of an apparatus and failure of detection of measuring machines and allows continuous safe operation.

Process for producing 1,3-di-(2-hydroperoxy-2-propyl) benzene

A process for extraction of hydroperoxides wherein 1,3-di-(2-hydroperoxy-2-propyl)benzene and 3-(2-hydroxy-2-propyl)-1-(2-hydroperoxy-2-propyl)benzene are extracted from a raw solution comprising 1,3-di-(2-hydroperoxy-2-propyl)benzene, 3-(2-hydroxy-2-propyl)-1-(2-hydroperoxy-2-propyl)benzene and an aqueous sodium hydroxide solution, said process using methyl isobutyl ketone containing not more than 10 ppm by weight of a phenol or phenols as a solvent for extraction.

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Chiba, Japan

Toshikazu Ohmae