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

Abstract

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 and stably removed, precipitation of polyethylene and oligomer generated in the reaction on a heat exchange wall surface is reduced, the cost of a cooling medium is reduced, meanwhile, the reaction temperature is stably controlled, and the reaction efficiency and selectivity are improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a device and process for producing 1-octene through selective oligomerization of ethylene. Background technique [0002] Linear α-olefins such as 1-butene, 1-hexene, 1-octene and 1-dodecene are important organic raw materials and intermediates that have developed extremely rapidly in recent years. The application of carbon alcohols, surfactants and other fields continues to increase, and their demand continues to grow. Selective oligomerization of ethylene is the main production method for linear α-olefins. Selective trimerization of ethylene to produce 1-hexene and selective tetramerization of ethylene to produce 1-octene have received extensive attention from both academia and industry. [0003] The heat of ethylene oligomerization reaction is large, and 2500-2800 MJ of reaction heat needs to be removed to obtain 1 ton of oligomerization product. The reaction temperature for...

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Problems solved by technology

[0008] Therefore, the present invention is aimed at the process reaction temperature of selective oligomerization of ethylene to produce 1-octene is relatively low, and exothermic heat is big, and small heat transfer temperature difference needs to consume a large amount of cooling water, but increasing heat transfer temperature difference is unfavorable for whole reaction being in optimum Reaction temperature, and the defect that polyethylene and oligomers are easily precipitated on the wall of the heat exchanger affects the removal of reaction heat, so as to provide a method that can effectively and smoothly remove the reaction heat and reduce the polyethylene and oligomers generated by the reaction on the heat exchange wall. Precipitation, reduce the cost of cooling medium, and at the same time make the reaction temperature control stable, improve the efficiency of the reaction and the selectivity of the device and process of ethylene selective oligomerization to produce 1-octene

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