Olefin separation device for upgrading coal-made stable heavy oil

Abstract

The invention relates to an olefin separation device for upgrading coal-made stable heavy oil. The olefin separation device comprises a heavy oil preheater, a heavy oil separation tower, a light hydrocarbon separation tower, and a heavy hydrocarbon separation tower. The heavy oil preheater is connected with the middle part of the heavy oil separation tower, and the heavy oil separation tower is provided with a C11 and lighter hydrocarbon gas phase outlet and a C12 and heavier hydrocarbon outlet. The C11 and lighter hydrocarbon gas phase outlet is connected with the middle part of the light hydrocarbon separation tower through a light hydrocarbon pipeline, the light hydrocarbon separation tower is provided with a C5-8 mixed hydrocarbon gas phase outlet and a C9-11 mixed hydrocarbon liquid phase outlet, and a first vacuum is connected with a light hydrocarbon return tank. The heavy hydrocarbon separation tower is provided with a C12-17 mixed hydrocarbon gas phase outlet and a C19 and heavier hydrocarbon liquid phase outlet, and the heavy hydrocarbon separation tower is provided with a C12-17 mixed hydrocarbon gas phase outlet and a C19 and heavier hydrocarbon liquid phase outlet. The olefin separation device disclosed by the invention can be used for separating the coal-made stable heavy oil into mixed olefin with narrow carbon number by taking the coal-made stable heavy oil as a raw material, so that the treatment difficulty in the subsequent processing process is favorably reduced, and the market additional value is high.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an olefin separation device for upgrading stable heavy oil produced from coal. Background technique [0002] α-Olefin is a very important basic raw material in the petrochemical industry and occupies an important position in the petrochemical industry. Among them, α-olefin, as an important organic raw material and intermediate product, is widely used in polyethylene comonomers, surfactants, lubricating oils, plasticizers, polyα-olefins, additives and fine chemicals. Among them, 1-butene, 1-hexene and 1-octene are mainly used as comonomers of polyethylene, 1-octene and C12 are used as raw materials for polyalphaolefin (PAO), and C14~C19 are used for the production of washing α-olefins above C19 are used in the production of lubricants and drilling fluids. [0003] Fischer-Tropsch synthesis coal indirect liquefaction technology is to synthesize CO and H2 in the synthesi...

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Problems solved by technology

[0003] Fischer-Tropsch synthesis coal indirect liquefaction technology is to synthesize CO and H2 in the synthesis gas into long carbon chain hydrocarbon macromolecules through iron-based catalysts. Fischer-Tropsch synthesis stable heavy oil is one of the intermediate products, which is separated by stripping tower , Olefins with different carbon chain lengths from Fischer-Tropsch synthetic heavy oil have long-term significance and broad market prospects. Coal-based α-olefins have an irreplaceable position for petroleum-based α-olefins. Odd carbon and high carbon number α-olefins It can be synthesized by the Fischer-Tropsch synthesis process, which cannot be obtained industrially by other synthesis processes

Fischer-Tropsch synthetic heavy oil has a wide range of carbon chain lengths, and the conventional treatment method is hydrogenation to obtain products with low carbon numbers. However, olefins with different carbon numbers have different uses. Difficulty, secondly, in the separation of Fischer-Tropsch synthetic heavy oil, the boiling points of different carbon numbers are inconsistent, and the energy consumption in order to obtain the target narrow carbon number olefins is serious

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