PRODUCITION OF 4-VINYLCYCLOGHEXENE, ETHYLBENZOLE AND STYRENE Russian patent published in 2009 - IPC C07C2/52 C07C5/367 C07C13/20 C07C15/73 C07C15/46 

FIELD: chemistry.

SUBSTANCE: method of 4-vinylcyclohexene production includes stages as follows: (A) preparation of n-butane-containing original gas flow, (B1) delivery of n-butane-containing original gas flow to the first dehydrogenation area and catalytic nonoxidation dehydrogenation of n-butane thus producing for gaseous product stream containing n-butane, 1-butene, 2-butene and as necessary, butadiene and secondary components, (B2) delivery of gaseous product stream containing n-butane, 1-butene, 2-butene, as necessary, butadiene and as necessary, secondary components to the second dehydrogenation area and oxidation dehydrogenation of 1-butene and 2-butene to butadiene thus producing gaseous product stream of s containing butadiene, n-butane, water vapour and as necessary secondary components, (C) delivery of product stream from dehydrogenation stage, if required after water vapour separation and secondary components, to dimerisation area and catalytic dimerisation of butadiene thus producing product stream containing 4-vinylcyclohexene, n-butane and, if required, 1-butene, 2-butene and unreacted butadiene, and (D) separation of 4-vinylcyclohexene from product stream of dimerisation stage and recirculation of n-butane and, if required, 1-butene, 2-butene and unreacted butadiene to dehydrogenation area. Method of ethylbenzol or styrene production includes aforesaid stages (A)-(D) and additional stage (E) delivery of 4-vinylcyclohexene to further dehydrogenation area and catalytic dehydrogenation to ethylbenzol or oxidation dehydrogenation with oxygen added thus making styrene.

EFFECT: method profitability, less by-products.

6 cl, 4 dwg, 1 ex