FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to a method of treatment of the parent material flow involving aromatic C8-products by isolation of at least part of para-xylene to obtain a flow depleted with para-xylene which is passed then through a molecular sieve membrane and obtaining the dissolved substance enriched with para-xylene. EFFECT: increased yield of para-xylene. 18 cl, 9 dwg
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