Process for preparing para-dioxanones
AssigneeShell Oil Company
InventorThomas C. Forschner
Life of this patent
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Abstract
A highly selective dehydrogenation catalyst for the preparation of para-dioxanones is produced by impregnating copper and zinc on a promoter impregnated support. This catalyst is effective for the dehydrogenation of dialkylene glycols to produce a high purity 2-para-dioxanones.
Claims23
In a process for the production of para-dioxanones by the catalytic dehydrogenation of dialkylene glycols, the improvement which comprises:
- contacting a dialkylene glycol at a temperature within the range of about 200.degree. C. to about 400.degree. C. with an effective amount of a dehydrogenation catalyst comprising catalytically effective amounts of copper, zinc and a promoter selected from the group consisting of alkali metals and alkaline earth metals and mixtures thereof supported on an alumina.
In a process for the production of para-dioxanones by the catalytic dehydrogenation of dialkylene glycols, the improvement which comprises:
- contacting a dialkylene glycol at a temperature within the range of about 200.degree. C. to about 400.degree. C. with an effective amount of a dehydrogenation catalyst produced by (a) impregnating an alumina with a promoter selected from the group consisting of alkali metal compounds and alkaline earth metal compounds, (b) subjecting the thus-impregnated alumina to a temperature within the range of about 80.degree. C. to about 900.degree. C., (c) impregnating at least one zinc compound and at least one copper compound on the alumina from step (b) to form a dehydrogenation catalyst, (d) calcining the dehydrogenation catalyst at a temperature within the range of about 100.degree. C. to about 900.degree. C., and (e) reducing the calcined dehydrogenation catalyst to activate the dehydrogenation catalyst.
In a process for the production of para-dioxanones by the catalytic dehydrogenation of diethylene glycol, the improvement which comprises:
- contacting diethylene glycol with a dehydrogenation catalyst at a temperature within the range of about 250.degree. C. to about 300.degree. C. and at a liquid hourly space velocity within the range from about 0.1 h.sup.-1 to about 3 h.sup.-1, said dehydrogenation catalyst is produced by (a) impregnating a .gamma.-alumina with a potassium compound, (b) subjecting the thus-impregnated alumina to a temperature within the range of about 80.degree. C. to about 900.degree. C., (c) impregnating at least one zinc compound and at least one copper compound on the alumina from step (b) to form a dehydrogenation catalyst, (d) calcining the dehydrogenation catalyst at a temperature within the range of about 100.degree. C. to about 900.degree. C., and (e) contacting the calcined dehydrogenation catalyst with a reducing atmosphere comprising a gas selected from the group consisting of hydrogen, ammonia, carbon dioxide and mixture thereof at a temperature within the range of about 175.degree. C. to about 550.degree. C.
Dependencies are inferred from the claim text.