An ethylene oligomerization process for creating a refined 1-butene product from ethylene using an ethylene oligomerization system, the ethylene oligomerization process comprising the steps of: introducing a reaction solution into a process fluid contained in an internal fluid conduit of an internal baffle single pass reactor at a proximal end of the reactor such that the process fluid traverses an operative length of the reactor by flowing along a process fluid flow pathway; introducing ethylene, an oligomerization pre-catalyst and a co-catalyst separately into the process fluid proximate to a oligomerization reaction zone such that the ethylene, the oligomerization pre-catalyst and the co-catalyst are distributed in the process fluid; introducing a catalyst inhibitor into the process fluid proximate to a catalyst deactivation zone such that the catalyst inhibitor is distributed in the process fluid; and operating the ethylene oligomerization system such that an oligomerization catalyst forms in the process fluid from the reaction of the oligomerization pre-catalyst and the co-catalyst in the oligomerization reaction zone, 1-butene forms in the process fluid from the oligomerization reaction of ethylene in the presence of the oligomerization catalyst in the oligomerization reaction zone, a deactivated oligomerization catalyst forms in the process fluid from the reaction of the oligomerization catalyst and the catalyst inhibitor in the catalyst deactivation zone, an external motion driver induces unsteadiness in the flow of the process fluid, a crude product passes into a separation system, the crude product comprising 1-butene, ethylene and the deactivated oligomerization catalyst, and the separation system selectively separates separately the deactivated oligomerization catalyst, the ethylene and the 1-butene from the crude product such that a refined 1-butene product is produced; where the ethylene oligomerization system comprises the internal baffle single pass reactor, the separation system and the exterior motion driver, where the internal baffle single pass reactor has an oligomerization reaction zone and a catalyst deactivation zone and where the catalyst deactivation zone is positioned downstream of the oligomerization reaction zone. introducing a reaction solution into a process fluid contained in an internal fluid conduit of an internal baffle single pass reactor at a proximal end of the reactor such that the process fluid traverses an operative length of the reactor by flowing along a process fluid flow pathway; introducing ethylene, an oligomerization pre-catalyst and a co-catalyst separately into the process fluid proximate to a oligomerization reaction zone such that the ethylene, the oligomerization pre-catalyst and the co-catalyst are distributed in the process fluid; introducing a catalyst inhibitor into the process fluid proximate to a catalyst deactivation zone such that the catalyst inhibitor is distributed in the process fluid; and operating the ethylene oligomerization system such that an oligomerization catalyst forms in the process fluid from the reaction of the oligomerization pre-catalyst and the co-catalyst in the oligomerization reaction zone, 1-butene forms in the process fluid from the oligomerization reaction of ethylene in the presence of the oligomerization catalyst in the oligomerization reaction zone, a deactivated oligomerization catalyst forms in the process fluid from the reaction of the oligomerization catalyst and the catalyst inhibitor in the catalyst deactivation zone, an external motion driver induces unsteadiness in the flow of the process fluid, a crude product passes into a separation system, the crude product comprising 1-butene, ethylene and the deactivated oligomerization catalyst, and the separation system selectively separates separately the deactivated oligomerization catalyst, the ethylene and the 1-butene from the crude product such that a refined 1-butene product is produced; an oligomerization catalyst forms in the process fluid from the reaction of the oligomerization pre-catalyst and the co-catalyst in the oligomerization reaction zone, 1-butene forms in the process fluid from the oligomerization reaction of ethylene in the presence of the oligomerization catalyst in the oligomerization reaction zone, a deactivated oligomerization catalyst forms in the process fluid from the reaction of the oligomerization catalyst and the catalyst inhibitor in the catalyst deactivation zone, an external motion driver induces unsteadiness in the flow of the process fluid, a crude product passes into a separation system, the crude product comprising 1-butene, ethylene and the deactivated oligomerization catalyst, and the separation system selectively separates separately the deactivated oligomerization catalyst, the ethylene and the 1-butene from the crude product such that a refined 1-butene product is produced; where the ethylene oligomerization system comprises the internal baffle single pass reactor, the separation system and the exterior motion driver, where the internal baffle single pass reactor has an oligomerization reaction zone and a catalyst deactivation zone and where the catalyst deactivation zone is positioned downstream of the oligomerization reaction zone.