FIELD: industrial organic synthesis. SUBSTANCE: epoxidation of olefin is carried out on several in series connected capacitive reactors, each of which contains fixed heterogeneous catalyst bed, for instance silica-supported titanium dioxide. When catalyst activity in any of reactors lowers to unacceptable level, this reactor is brought out of the process and an additional reactor containing fresh or regenerated catalyst is brought in. Indicated reactor, according to different embodiments of the process, can be included into succession of reactors as the first or the latter one. For example, inlet stream can be first brought into contact either with most active or with least active portion of catalyst in reactor succession. Whereas the last option allows increasing to some extent life time of catalyst, the first one requires considerably lower productivity of heat- exchangers. EFFECT: essentially reduced consumption of catalyst compared to conventional fixed catalyst-bed epoxidation processes wherein all amount of catalyst is replaced or regenerated simultaneously. 26 cl, 2 dwg, 4 tbl, 2 ex
