Method for producing marine fuel oil by hydrogenation

Abstract

The invention discloses a method for producing low-sulfur marine fuel oil through hydrogenation. The method comprises the following steps: (1) mixing a residual oil raw material with relatively good properties with an up-flow hydrogenation reactor effluent obtained in step (2) and hydrogen, and feeding the mixture into a fixed bed hydrogenation unit for a first hydrofining reaction to obtain hydrogenated oil; the hydrogenated generated oil is sequentially subjected to normal-pressure fractionation and vacuum fractionation to obtain hydrogenated vacuum residual oil and hydrogenated vacuum wax oil; (2) mixing part of the hydrogenated vacuum residual oil with a residual oil raw material with relatively poor properties and hydrogen, feeding the mixture into an up-flow hydrogenation reactor, and carrying out a second hydrofining reaction to obtain an up-flow hydrogenation reactor effluent; and (3) mixing part of the hydrogenated vacuum residual oil with the hydrogenated vacuum wax oil to obtain the marine fuel oil product. When the method is used for treating the inferior residual oil raw material, a low-sulfur marine fuel oil product which meets the index requirements of sulfur content, viscosity and the like and has a stable peptizing system can be obtained.

Description

Technical field [0001] The present invention involves a process method for the production of clean fuel oil for inferior slag oil. Specifically, it is based on the process method of flexibly producing fuel oil for low -sulfur boat fuel oil based on inferior high -quality high -sulfur oil. Background technique [0002] As global environmental protection regulations are becoming more stringent, after the completion of light -quality oil such as cleaning gasoline and diesel, clean low -sulfur ship fuel oil will become one of the key oil products in the next few years.International Maritime Organization (IMO) "International Prevention of Ship" stipulates that since January 2020, the sulfur mass scores of ship fuel oil used in general regions of the sea areas have been reduced from no more than 3.5%to no more0.5%; when sailing in the discharge control area, the sulfur content of ship fuel oil should not exceed 0.1%.In the market for ship fuel oil, high -sulfur residual fuel oil is abo...

AI Technical Summary

Problems solved by technology

Along the direction of the liquid phase flow, the reaction temperature gradually increases. The disadvantage of this route is that the hydrogen consumption is high during the hydrogenation process and the amount of hydrogenation is large. Usually, when the sulfur content meets the index, a higher reaction severity is required. Under the condition of high temperature and high pressure, the sulfur content meets the requirements of the indicators, and other indicators such as carbon residues are greatly reduced, the conversion rate is increased, and the processing cost is high.

This method needs to use the conventional residual oil hydrogenation process to reduce the sulfur in the residual oil raw material to less than 1500 wppm. However, due to the substantial increase in production costs due to the addition of a large proportion of diesel and other fractions, it still cannot overcome the poor quality of the conventional residual oil hydrogenation process. The production cycle of residual oil raw materials is short, the difficulty of product reconciliation increases, the process is complicated, and the economy is poor

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