| 摘要 |
PURPOSE: To remove a catalyst efficiently, economically and for long period from a catalytic reaction product by passing the catalytic reaction product containing the solid catalyst through a hollow tubular filter medium which has a tapered pore distribution such that the pore size of the filter medium decreases in the direction of flow and is back washable. CONSTITUTION: The method to remove a catalyst from a catalytic reaction product is executed by passing the catalytic reaction product containing the solid catalyst through a hollow tubular filter medium which comprises a nonwoven web of fibers, has a tapered pore distribution such that the pore size of the filter medium decreases in the direction of normal fluid flow, and is back washable. Thereby a sufficient amount is removed from the catalytic reaction so as to comprise an allowable level of catalytic impurity in the product. When the filter medium is stacked by a micro particle material, for example when a decrease of pressure in front and in the rear of the filter medium reaches a non allowable level the filter medium is back washed to remove the catalyst of the filter medium or a cake formed by a coagulation of other impurities.
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