BENZENE PRODUCTION PROCESS

摘要

FIELD: petrochemical processes. ^ SUBSTANCE: C6-C8-hydrocarbon fraction is obtained through rectification combined with two-step hydrogenation and then subjected to hydrodealkylation. Products are separated into gaseous and liquid fractions. Process of invention is characterized by that at least part of hydrogenated C6-C8-hydrocarbon fraction is subjected to additional rectification, wherein product containing 30 to 95% benzene based on content thereof in C6-C8-hydrocarbon fraction is withdrawn from the top of additional rectification column or as side product, while bottom product of the column containing the rest of benzene and higher-boiling aromatic or nonaromatic C7-C8-hydrocarbons is directed to hydrodealkylation. Distillate product containing 30 to 95% benzene is further subjected to extractive rectification with selective solvent to recover from fraction of nonaromatic hydrocarbons as distillate of extractive rectification column, whereas loaded selective solvent from this column undergoes desorption to recover benzene. ^ EFFECT: enhanced benzene production efficiency from various-origin benzene-containing hydrocarbon blends. ^ 6 cl, 4 dwg, 2 tbl, 8 ex