INTEGRATED PROCESS FOR PREPARING ALKENYL-SUBSTITUTED AROMATIC COMPOUND Russian patent published in 2006 - IPC C07C15/40 C07C15/46 C07C5/333 C07C2/66 

FIELD: chemistry of aromatic compounds, chemical technology.

SUBSTANCE: process involves the following stages: feeding (C₂-C₅)-alkane, for example, ethane and (C₂-C₅)-alkyl-substituted aromatic compound, for example, ethylbenzene into dehydrogenation reactor for the simultaneous dehydrogenation to (C₂-C₅)-alkene, for example, to ethylene, and (C₂-C₅)-alkenyl-substituted aromatic compound, for example, styrene; separation of the outlet dehydrogenation flow for extraction of gaseous flow containing alkene, hydrogen and alkane, and for extraction of aromatic compounds with the high effectiveness by cooling and compression; feeding a gaseous flow and (C₆-C₁₂)-aromatic compound into the alkylation reactor for preparing the corresponding (C₂-C₅)-alkyl-substituted aromatic compound that is recirculated into the dehydrogenation reactor; feeding the blowing flow from the alkylation unit containing alkane and hydrogen for the separation stage by using cryogenic separator for extraction of alkane that is recirculated into the dehydrogenation reactor, and hydrogen that is extracted with the purity value 99%. Invention provides the development of economic and highly effective process for preparing alkenyl-substituted aromatic compounds.

EFFECT: improved preparing method.

61 cl, 2 tbl, 2 dwg, 2 ex