Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce aromatic
Reexamination Certificate
2006-02-21
2006-02-21
Wood, Elizabeth D. (Department: 1755)
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce aromatic
C585S314000, C585S440000, C585S444000
Reexamination Certificate
active
07002052
ABSTRACT:
An integrated process of preparing a C2-5alkenyl-substituted aromatic compound using a C6-12aromatic compound and a C2-5alkane as raw materials. The process involves feeding a C2-5alkane, for example ethane, and a C2-5alkyl-substituted aromatic compound, for example ethylbenzene, to a dehydrogenation reactor for concurrent dehydrogenation to a C2-5alkene, for example ethylene, and a C2-5alkenyl-substituted aromatic compound, for example stryrene; separating the dehydrogenation effluent to recover a gaseous stream containing alkene, hydrogen, and alkane, and to recover the aromatics with high efficiency; feeding the gas stream and a C6-12aromatic compound to an alkylation reactor to obtain the corresponding C2-5alkyl-substituted aromatic compound, which is recycled to the dehydrogenation reactor; subjecting the alkylation unit vent stream containing alkane and hydrogen to a separation step to recover alkane, which is recycled to the dehydrogenation unit; hydrogen, which is recovered at 99% chemical grade purity and energy.
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Castor William M.
Hamper Simon
Pierce Richard A.
Dow Global Technologies Inc.
Wood Elizabeth D.
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