METHOD FOR PRODUCING XYLENES BY METHOD OF COMBINING METHYLATION AND TRANSALCYLATION Russian patent published in 2018 - IPC C07C6/12 C07C15/08 C07C2/86 

FIELD: chemistry.

SUBSTANCE: invention relates to a process for the preparation of a mixture of benzene and C₈-aromatic compounds. Method involves: providing a feed stream containing benzene, toluene, C₈-aromatic compounds and C₉-aromatic hydrocarbons; separating from the feed stream of the first fraction containing C₈-aromatic compounds, a methylation feedstock containing toluene and not containing benzene, and a feedstock for transalkylation containing benzene and C₉-aromatic hydrocarbons; feeding the methylation feed to the methylation reaction to obtain a mixture of C₈- and C₉₊ aromatic compounds; supplying raw materials for transalkylation and C₉₊ aromatic compounds derived from the methylation reaction to a transalkylation reaction for the conversion of C₉-aromatic hydrocarbons and C₉₊-aromatic compounds from the methylation reaction in C₈-aromatic compounds; and transferring the fraction of benzene and toluene obtained from the methylation reaction to a transalkylation reaction to maintain the molar ratio of the methyl group to the phenyl group in the range of 1.5-2.2 in the transalkylation reaction.

EFFECT: this complex method maximizes the production of xylenes and reduces or minimizes the yield of benzene.

5 cl, 6 dwg