REACTION FRACTIONATION WITH RETURN OF OLEFINS INTO PROCESS Russian patent published in 2011 - IPC C07C1/24 C07C11/04 C07C11/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkene(s) from starting material consisting of monoatomic aliphatic paraffin primary (and/or secondary) alcohol(s), containing ethanol, propanol(s) or mixture thereof, characterised by the following steps: 1) monoatomic aliphatic paraffin primary (or secondary) alcohol(s) in a reaction-fractionation column at high pressure and high temperature in the presence of a catalyst is converted to alkene(s) with the corresponding number of carbon atoms so that stream of overhead distillates tapped from the top part of the said reaction-fractionation column essentially includes said alkene(s), 2) the stream of overhead distillates from step 1 is then cooled to temperature which is sufficient for condensation of at least a portion of alkene(s) with the highest boiling point, 3) further at least a portion of the condensed alkene(s) from step 2 is returned to the said reaction-fractionation column as reflux, 4) the remaining alkene(s) are simultaneously extracted. The invention also relates to a method of converting hydrocarbon to alkene, involving the method given above.

EFFECT: improved method of producing C2+ alkene from alcohols.

11 cl, 1 dwg