Method for producing fuel oils by hydrogenation after coal tar cleaning and phenol extraction and system thereof

Abstract

The invention relates to a method for producing fuel oils by hydrogenation after coal tar cleaning and phenol extraction and a system thereof. According to the technical scheme, coal tar is sent into a distillation column to separate a phenol-rich fraction and other fractions; dephenolized oil obtained after cleaning and phenol extraction of the phenol-rich fraction is used as solvent naphtha to be mixed with a catalyst and a vulcanizing agent, and the mixture is vulcanized to prepare catalyst slurry; the other fractions and the catalyst slurry are mixed and the mixture is sent into a slurry-bed hydrocracking reactor to undergo a hydrocracking reaction; reactants obtained after the hydrocracking reaction are then sent into a separation system to separate hydrogen-rich gas, light oil and tail oil containing a catalyst; the light oil is sent into a fixed-bed hydrogenation reactor to undergo a hydrofining reaction; and reactants obtained after the hydrofining reaction are sent into a fractionating tower to separate gaseous hydrocarbon, a gasoline fraction and a diesel fraction. The technology of the invention is simple; utilization rate of raw materials is high; the system is environmentally friendly, has low production cost and operating cost and is simple to maintain; service life of a catalyst is prolonged; and product yield is high.

Description

technical field [0001] The invention relates to a method and system for producing fuel oil, in particular to a method and system for producing fuel oil by hydrogenation after cleaning and extracting phenol from coal tar. Background technique [0002] With the rapid economic development, the market demand for light oil products is increasing day by day. Coal tar hydrogenation is an effective way to make it lighter and cleaner, and it is also the main direction of exploration for the processing and utilization of coal tar. Coal tar is a by-product of coal coking, carbonization and gasification. The whole fraction of coal tar is different from crude oil or heavy oil, its composition is complex, and the content of aromatics, colloids and asphaltenes is relatively high, especially the oxygen content is about 8wt%. Oxygen mainly exists in the form of phenolic and furanic compounds, and phenolic compounds are one of the basic raw materials of chemical industry with high added valu...

AI Technical Summary

Problems solved by technology

However, the hydrogenation of the whole fraction of coal tar will convert the high value-added phenolic compounds in the tar into hydrocarbons and water, which reduces the added value on the one hand; on the other hand increases the hydrogen consumption, and the presence of water will also reduce the activity and life of the catalyst. and increased corrosion of equipment and pipelines

In addition, the process uses a water-soluble nickel phosphomolybdate catalyst, which has a large dispersion vulcanization system, complex equipment, and high energy consumption

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