Device and process for producing 1-octylene by ethylene selective oligomerization

The invention provides a device and a process for producing 1-octylene by ethylene selective oligomerization, and relates to the field of chemical industry. The device comprises an oligomerization reactor, the circulation pipeline is led out from the top of the oligomerization reactor and returns to the oligomerization reactor, a gas compression device, a heat exchanger and a gas-liquid separator are sequentially arranged on the circulation pipeline, the gas compression device is connected with the top of the oligomerization reactor, and a gas phase outlet and a liquid phase outlet of the gas-liquid separator are respectively communicated with the inside of the oligomerization reactor. A solvent used in the process can comprise a low-boiling-point component and a high-boiling-point component, the low-boiling-point component is selected from C3-C5 hydrocarbons, and the high-boiling-point component is selected from C6-C10 hydrocarbons. According to the device and the process, reaction heat can be effectively an