Method for producing clean fuel oil from ethylene tar

Abstract

The invention discloses a method for producing clean fuel oil from ethylene tar. The method is as follows: fractionating the ethylene tar into a light fraction, a middle fraction and a heavy fraction, mixing the heavy fraction with a conventional coking raw material, conducting delayed coking to obtain coker gasoline, coker diesel oil and coker wax oil, mixing the obtained coker gasoline with the ethylene tar light fraction, leaving the mixed material to undergo hydrofining, performing rectification/ crystallization purification on the middle fraction to obtain naphthaline, mixing naphthaline removal oil after naphthaline extraction and naphthaline post-fraction oil with the coker diesel oil and the coker wax oil for hydrotreating, and separating an obtained product and the hydrofining product of the coker gasoline and the ethylene tar light fraction to obtain gasoline diesel oil products. Directed at the characteristics of high content of aromatic hydrocarbons, colloid, carbon residue and asphaltene in the ethylene tar, the method provided in the invention fractionates the ethylene tar into the light fraction, the middle fraction and the heavy fraction, and adopts different processing processes, thus not only enhancing the additional value of the ethylene tar, improving the product quality of light fuel oil in the same time of obtaining of the chemical raw material naphthaline, but also enabling the equipment to run smoothly for a long period.

Description

technical field [0001] The invention relates to a method for producing clean fuel oil from ethylene tar, in particular to a combined process of delayed coking and hydrogenation for blending ethylene tar. Background technique [0002] The increasing shortage of world oil resources and the increasing price make it necessary for refineries to reduce emissions and increase efficiency. Ethylene tar is currently mainly sold as heavy fuel oil or carbon black raw materials, with low added value. [0003] Ethylene tar is a high-temperature condensation product of ethylene cracking raw materials and products in the steam cracking process. Its initial boiling point is 170-260°C, and its final boiling point is >600°C, generally 600-700°C. It belongs to the heavy fraction range. Ethylene tar is mainly a mixture of double-ring and above condensed-ring aromatics, the content of aromatics is over 90wt%, and the density (20°C) is greater than 1.0g / cm 3 , Low content of impurities such as...

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Problems solved by technology

[0006] There are reports on delayed coking of vacuum residue blended with ethylene tar: CN101608132A, "Response Surface Analysis Method Optimizing the Delayed Coking Research of Blending Ethylene Cracking Tar" (see "Petroleum Refining and Chemical Industry" 2009 No. 8 P5- P8. "Research on Blending Daqing Pyrolysis Tar in Delayed Coking Unit" (see "Petroleum Refining and Chemical Industry" 2007, No. 12 P20-P22), "Influence of Blending Ethylene Cracking Heavy Oil on Delayed Coking" (see "Petrochemical Technology and Application" 2010 No. 1 P44-P49) and "Vacuum Residue Blending Ethylene Heavy Tar Cocoking Test" (see "Journal of Maoming University" 2008 No. 1 P7-P9, etc. These studies are all ethylene The whole distillate of tar is blended with vacuum residue as raw material for delayed coking, which will make the yield of liquid and light fuel oil products lower, and the quality of the resulting liquid products—coker gasoline, diesel oil and wax oil remains the same. Poor, needs further processing

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