Method for increasing yield of clean fuel oil

Abstract

The invention discloses a method for increasing the yield of clean fuel oil. The method comprises the following steps: subjecting ethylene tar to fractionation so as to obtain a light fraction and a heavy fraction, mixing the heavy fraction with a conventional coking raw material, then subjecting the mixture to a delay coking treatment so as to obtain a coking product, transporting the coking product and a C9 component from an ethylene device into a coking distillation tower, carrying out a distillation treatment so as to obtain a coking gasoline fraction and a coking diesel oil fraction, carrying out a hydro-refining treatment on the obtained coking gasoline fraction, mixing the coking diesel oil fraction with the ethylene tar light fraction, then subjecting the mixture to a hydro-treatment, and separating the products so as to obtain a gasoline product and a diesel oil product. The method fully utilizes the ethylene tar and C9 fraction, improves the utilization rate of by-products of ethylene device, prominently improves the yield and quality of lightweight fuel oil, and is beneficial for yield increasing of high quality clean fuel oil for refineries.

Description

technical field [0001] The invention relates to a method for producing clean fuel oil, in particular to a combined process of delayed coking and hydrogenation of by-product C9 and ethylene tar from an ethylene plant. Background technique [0002] At present, the world's oil resources are increasingly scarce and the price is increasing. On the other hand, with the improvement of people's living standards, the demand for clean motor transportation fuels is increasingly strong. This contradiction makes it necessary for refineries to reduce emissions and increase efficiency, and it is of practical significance to convert the by-products of refineries that have not been fully utilized into clean fuel oil. [0003] C9 fraction is a by-product of ethylene cracking, which accounts for about 10wt%~15wt% of the total ethylene production. Due to the large amount of alkenyl aromatic hydrocarbons and dienes, the product properties are relatively unstable, and it is easy to form rubber an...

AI Technical Summary

Problems solved by technology

CN101724447A adopts hydrogenation method to produce gasoline blending components for C9 fraction. The process conditions used only selectively remove diolefins and colloids. Monoolefins, sulfur compounds and aromatics do not react, so they can only be used as gasoline blending components. , as a finished gasoline, it is necessary to further adopt the selective hydrodesulfurization process, so it is still equivalent to a two-step hydrogenation process, which has the problems of long process flow, high investment and operating costs

[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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