METHOD FOR PRODUCTION OF ANTIKNOCK GASOLINE FRACTIONS Russian patent published in 1995 - IPC

FIELD: petroleum chemistry. SUBSTANCE: method for production of antiknock gasoline fractions provide for rectification of hydrocarbon stock to produce hexane, and/or heptane, and/or octane, and/or nonane, and/or heavy gasoline fraction which contact catalyst based on ZSM zeolite, including ZSM-5, including that modified with elements of the second, sixth and eighth groups of Periodic system. Products of containing are separated into gaseous and liquid ones. The latter are mixed with residual stock fraction. Separated during rectification are above indicated fractions boiling out for, at least, 50 vol. within temperature ranges of 65-75, 95-105, 120-130, 146-150 C, and heavy gasoline fraction which boils out for, at least, 70% at temperature higher than 96, or 120 or 145 C. Contacting is effected at temperature of 300-480 C, pressure of 0.2-0.4 MPa and possibly in the medium of hydrogen-containing gas. EFFECT: higher efficiency. 6 cl, 5 tbl