REACTION FRACTIONATION FOR DEHYDRATING MIXED ALCOHOLS Russian patent published in 2011 - IPC C07C1/24 C07C11/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkene(s) from starting material which contains at least one monoatomic aliphatic paraffin alcohol, containing 2-5 carbon atoms, characterised by the following steps: 1) monoatomic aliphatic paraffin alcohol(s), containing 2-5 carbon atoms, in a reaction-fractionation column at high pressure and high temperature, are converted to a stream of overhead distillates containing alkene(s) and ether(s) with the corresponding number of carbon atoms, 2) the stream of overhead distillates from step 1 is then divided into a stream rich in ether(s) and a stream rich in alkene(s), 3) further, at least a portion, preferably all, of the stream rich in ether(s) from step 2 is returned in form of reflux into the reaction-fractionation column, 4) the stream rich in alkene(s) from step 2 is simultaneously divided into alkene(s) and ether(s), 5) at least a portion, preferably all, of the extracted ether(s) from step 4 is returned the said reaction-fractionation column, after which 6) a stream of alkene(s) is extracted from step 4. The invention also relates to a method of converting hydrocarbons to alkene, involving the method described above.

EFFECT: use of the present invention enables to lower expenses on separating desired products from by-products.

11 cl, 1 ex, 1 dwg