| 摘要 |
PURPOSE:To prolong catalyst life efficiently and to reduce the catalyst cost by adding liquid water corresponding to an amt. not exceeding the pore volume of a solid catalyst which has been deteriorated to have decreased activity, and mixing the water so as to disperse to the inside of the pores. CONSTITUTION:An amt. of water corresponding to the amt. not exceeding the pore volume of a solid catalyst which is packed in a fluidized bed reactor and has been used for the production of phthalic anhydride by the air oxidation of naphthalene, is added to the catalyst in the form of liquid water. The catalyst is regenerated by mixing the water so as to disperse in the above described catalyst cells. Further, another regeneration process, wherein an amt. of water not exceeding the pore volume of the solid catalyst is added in the form of liquid water to the catalyst which has been used for the production of phthalic anhydride and the used catalyst is regenerated after mixing the added water with the used catalyst sufficiently by evaporating the water so as to cause redeposition of effective components of the used catalyst eluted by the added water, on the carrier of the solid catalyst, is also suitable.
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