The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 1980
Filed:
Apr. 26, 1977
George W Lyon, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A method for dehydrogenating an alkyl aromatic compound, particularly, ethylbenzene or ethyl toluene, to its corresponding vinyl aromatic derivative, styrene or methyl styrene, respectively, in which the alkyl aromatic compound and its normally attendant diluent, stream or water, are preheated to a temperature below which any substantial thermal reaction temperature of the alkyl aromatic compound occurs, viz., 450.degree. to about 500.degree. C., and introduced into a catalytic bed of a reactor and thereafter contacted and mixed in said catalytic bed with a quantity of steam in an amount and at a temperature to raise the alkyl aromatic compound to the catalytic dehydrogenation temperature. The steam introduced into the catalyst bed, in a ratio less than 3 to 1 to about 0.7 to 1, steam to hydrocarbon passes through the bed in heat exchange relationship to the catalyst and the reacting gases prior to contacting and mixing with the alkyl aromatic compound in the bed.