METHOD OF OLIGOMERIZATION OF LOWER OLEFINS IN GAS-LIQUID PHASE Russian patent published in 2002 - IPC

FIELD: petrochemical processes. SUBSTANCE: gas-liquid-phase oligomerization of C2-C4- olefins (from ethylene, propane-propylene, and butane-butylene fractions) contained in gases from various catalytic processes (catalytic cracking, pyrolysis, emission plume gases) are oligomerized at elevated temperatures and pressure to yield low-molecular oligomers useful as high- antiknock motor fuel additives. Process is carried out in presence of (i) nickel-aluminosilicate catalyst supplemented by zeolite of the type of pentasil and faujasite and summarily containing, wt %: nickel oxide 10-80, alumina 1-50, silica 10- 60, and zeolite 1-40, and (ii) solvent-eluent: liquid hydrocarbons of general formula , benzene or its homologues as well as their mixtures, and also straight-run gasolines. Process conditions: temperature 30 to 100 C, pressure 1.0 to 10 MPa, volumetric flow rate 0.5-2 h^-1 for liquid raw material and 250-1100 h^-1 for gas raw material, the same parameter for solvent-eluent being 0.5-1.0 h^-1. Lower olefins contain up to 2.5% hydrogen sulfide and up to 5.0% hydrogen. EFFECT: enabled rejection of reaction heat to avoid localization of superheating on the catalyst surface. 3 tbl, 51 ex