| 摘要 |
An integrated process of preparing a C<SUB>2-5 </SUB>alkenyl-substituted aromatic compound using a C<SUB>6-12 </SUB>aromatic compound and a C<SUB>2-5 </SUB>alkane as raw materials. The process involves feeding a C<SUB>2-5 </SUB>alkane, for example ethane, and a C<SUB>2-5 </SUB>alkyl-substituted aromatic compound, for example ethylbenzene, to a dehydrogenation reactor for concurrent dehydrogenation to a C<SUB>2-5 </SUB>alkene, for example ethylene, and a C<SUB>2-5 </SUB>alkenyl-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 C<SUB>6-12 </SUB>aromatic compound to an alkylation reactor to obtain the corresponding C<SUB>2-5 </SUB>alkyl-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. |
