FIELD: industrial organic synthesis. SUBSTANCE: invention relates to preparing tert-amylmethyl ether via interaction of isoamylenes, contained in products of light naphtha cracking, with methanol. Two reaction distillation zones are disposed above stripping section, wherein unreacted tert-amylmethyl ether, C6 and higher components are stripped. First distillation reaction zone contains hydrofining catalyst to remove diolefins and mercaptans, while the second one contains acid cation-exchange for etherification reaction. EFFECT: achieved fractional multicomponent reaction system simultaneously with performing multiple reactions. 8 cl, 1 dwg, 1 tbl
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