Method for reactivating catalyst for methacrylic acid preparation
AssigneeNippon Shokubai Co., Ltd.
InventorsHiroto Kasuga, Eiichi Shiraishi
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Abstract
This invention provides a method of reactivating a catalyst for methacrylic acid production, which catalyst is used in production of methacrylic acid through vapor-phase oxidation of methacrolein or vapor-phase oxidative dehydrogenation of isobutyric acid, contains P and Mo, and exhibits reduced activity. The process comprises treating the catalyst, whose activity level has dropped (deteriorated catalyst), with a gas containing a nitrogen-containing heterocyclic compound (e.g., pyridine, piperidine, piperazine, quinoline).
Claims26
A method of reactivating a catalyst for methacrylic acid production, comprising treating a catalyst used in methacrylic acid production by vapor-phase oxidation of methacrolein or vapor-phase oxidative dehydrogenation of isobutyric acid, said catalyst containing P and Mo and exhibiting reduced activity, with a gas containing a nitrogen-containing heterocyclic compound.
A method of reactivating a catalyst for methacrylic acid production, comprising treating a catalyst used in methacrylic acid production by vapor-phase oxidation of methacrolein or vapor-phase oxidative dehydrogenation of isobutyric acid, said catalyst containing P and Mo and exhibiting reduced activity, with a gas containing a nitrogen-containing heterocyclic compound and steam;
- or with a gas containing a nitrogen-containing heterocyclic compound and a steam-containing gas.
The method according to claim in 14 in which said catalyst exhibiting reduced activity has been deteriorated in consequence of exposure to high temperatures resulting from temperature control failure during a calcination step in the course of catalyst preparation.
The method according to claim in 15 in which said catalyst exhibiting reduced activity has been deteriorated in consequence of exposure to high temperatures resulting from temperature control failure during a calcination step in the course of catalyst preparation.
Dependencies are inferred from the claim text.