OBTAINING ALKYLAROMATIC COMPOUNDS Russian patent published in 2019 - IPC C07C2/66 C07C6/12 C07C15/85 

FIELD: chemistry.

SUBSTANCE: invention relates to three versions of the method of producing a monoalkylated aromatic product. One of the versions includes: (a) contacting benzene and an alkylating agent with an alkylation catalyst in a first alkylation reaction zone under alkylation conditions to produce a first alkylation alkylation stream containing a monoalkylated aromatic product, a polyalkylated aromatic product, unreacted benzene and non-aromatic compounds C₅, C₆ and/or C₇; (b) removing the purge stream containing non-aromatic compounds C₅, C₆ and/or C₇ and unreacted benzene, from alkylation first effluent stream; (c) contacting at least a portion of the purge stream with an alkylating agent in a second alkylation reaction zone in the presence of an alkylation catalyst in alkylation conditions to produce a second alkylation effluent stream comprising a monoalkylated aromatic product, a polyalkylated aromatic product and non-aromatic compounds C₅, C₆ and/or C₇; (d) extracting the monoalkylated aromatic product from the first and second alkylation effluents; and (e) blowing at least part of non-aromatic compounds C₅, C₆ and/or C₇ in second alkylation effluent stream; wherein the alkylating agent used on each of (a) and (c) contains an alkylating agent C₂ or C₃.

EFFECT: use of the disclosed method enables to reduce output losses associated with non-aromatic purging during alkylation of aromatic compounds.

14 cl, 10 ex, 2 dwg