| abstract |
(57) [Summary] [Structure] In a method for producing styrene, which comprises a hydrorefining step of an aromatic hydrocarbon raw material, a hydrodealkylation step of alkylbenzene, an ethylation step of benzene, and a dehydrogenation step of ethylbenzene, a dehydrogenation step The hydrogen-containing exhaust gas produced as a by-product is used as a hydrogen source in the hydrorefining step and the hydrodealkylation step. Further, the decomposition gas produced as a by-product in the hydrodealkylation step is used as a heating source in the dehydrogenation step. [Effect] Hydrogen consumption is low in the entire process. The hydrogen in the exhaust gas can be effectively used. It also uses less fuel. |