OBTAINING STYROL FROM ETHYLBENZENE BY MEANS OF AZEOTROPIC EVAPORATION AND WITH LOW TOTAL WATER - ETHYLBENZENE RATIOS Russian patent published in 2015 - IPC C07C5/333 C07C7/06 C07C15/46 

FIELD: chemistry.

SUBSTANCE: invention relates to method of alkylaromatic hydrocarbon dehydration, which includes: contact of vapour reagent flow, containing alkylaromatic hydrocarbon and water vapour and having first weight ratio of vapour to alkylaromatic hydrocarbon, with dehydration catalyst with formation of vapour-phase output flow, which contains hydrocarbon product, water vapour and alkylaromatic hydrocarbon, which did not react; supply of, at least, part of output flow into separator for separation of hydrocarbon product from alkylaromatic hydrocarbon, which did not react, removed from separator in form of bottom and main fractions respectively; utilisation of heat of first part f said main fraction by indirect heat-exchange with mixture, containing alkylaromatic hydrocarbon and water, for at least, partial condensation of said part and formation of azeotropic evaporation product, which contains vapour of alkylaromatic comound and water vapour, having second ratio of vapour to alkylaromatic hydrocarbon; and combination of azeotropic evaporation product with additional alkylaromatic hydrocarbon and additional vapour, together or separately, with formation of vapour reagent flow.

EFFECT: application of claimed method makes it possible to use heat of upper separator distillate more effectively.

12 cl, 5 dwg