Process for dehydrogenation of alkyl aromatic compounds

Details Process for dehydrogenation of alkyl aromatic compounds Process for dehydrogenation of alkyl aromatic compounds

1992-10-28

1997-10-21

Caldarola, Glenn A.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

Having alkenyl moiety, e.g., styrene, etc.

585440, 585435, C07C 264, C07C 1546

Patent

active

056798784

ABSTRACT:
This invention relates to a vapor phase process for the production of an alkyl styrene by the catalytic dehydrogenation of tertiary butylethylbenzene in the presence of catalysts containing iron oxides under conditions which minimize the undesirable thermal degradation of the raw material and the product while maintaining good yield and selectivity with low production of by-products. Specifically, it has been discovered that these desired results may be obtained by conducting the subject reaction at relatively low temperatures of between about 1000.degree. F. and about 1100.degree. F. and by maintaining a low partial pressure (i.e., not greater than about 0.5 psi) of the alkyl ethylbenzene in the reaction mixture. The desired partial pressure of the alkyl ethylbenzene is obtained by carrying out the catalytic reaction at a pressure of between about 1 psia and about 30 psia with steam as a diluent, the weight ratio of steam to alkyl ethylbenzene being between about 3 and about 30.

REFERENCES:
patent: 3631213 (1971-12-01), Brewer
patent: 4291183 (1981-09-01), Crum et al.
patent: 4291184 (1981-09-01), Crum et al.
patent: 4551571 (1985-11-01), Sarumaru et al.
patent: 4590324 (1986-05-01), Satek
patent: 4982034 (1991-01-01), Moore et al.

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