It is shown that the “bulk type” reactor proposed for obtaining carbon nanofibers from carbon monoxide can be used to obtain carbon nanofibers from organic raw materials electrocracking gas without changing the shape of the reaction cell. The “bulk type” reactor allows to combine the process of obtaining carbon nanofibers and separation of the formed products, and this allows to simplify the technology of carbon nanofibers. Varying the speed of the introduction of the catalyst in the synthesis zone under the same process conditions (temperature, volumetric gas flow rate, the composition of the gas) enables to obtain products with different characteristics. Using the maсrokinetics peculiarities of topochemical reactions of hydrocarbons decomposition it is possible to provide uninterrupted continued operation of the reactor and the obtaining of a product with the desired properties.