METHOD TO PRODUCE STYRENE MONOMER WITH HIGHER ENERGY EFFICIENCY AND INJECTION OF RECIRCULATING GAS INTO ETHYLBENZENE EVAPORATOR Russian patent published in 2012 - IPC C07C5/333 C07C15/46 

FIELD: blasting.

SUBSTANCE: invention relates to versions of the method to produce styrene monomer from ethylbenzene, one of which includes the following stages: supplying liquid ethylbenzene, as the initial material, into an evaporation apparatus, which may convert liquid ethylbenzene into gaseous ethylbenzene, at the same time the evaporation apparatus produces the overhead product containing gaseous ethylbenzene; supplying the gaseous mixture into the specified evaporation apparatus, at the same time the gaseous mixture includes a certain amount of gas containing carbon dioxide sufficient to reduce ethylbenzene boiling temperature at least by 5°C, where at least some gas is recirculated from processes of catalytic dehydrogenisation or catalytic oxidehydrogenisation; heating of the evaporator, to thus convert liquid ethylbenzene into gaseous ethylbenzene, at the same time gaseous ethylbenzene is extracted in overhead products of the evaporator; and catalytic dehydrogenisation or oxydehydrogenisation of ethylbenzene in evaporated overhead products, to therefore catalytically produce styrene monomer.

EFFECT: invention is a cost-effective and energetic method to produce styrene from ethylbenzene.

9 cl, 4 ex, 1 dwg