FIELD: chemistry.
SUBSTANCE: at the first stage a flow containing first non-saturated hydrocarbon contacts first dehydration catalyst with temperature factor T1 and selectivity factor S1; at the second stage the first stage reaction product containing first and second non-saturated hydrocarbon contacts second dehydration catalyst with temperature factor T2 and selectivity factor S2, so that T1<T2 and S1<S2. Temperature factor denotes temperature in °C, at which a single dehydration catalyst sustains 70 molar % of the first non-saturated hydrocarbon transformation in definite conditions, and selectivity factor denotes selectivity in molar %, which is achieved for the second non-saturated hydrocarbon.
EFFECT: high general selectivity at low operation temperature and high volume flow rate.
14 cl, 1 tbl, 2 ex
