Production method of gasoline and low-sulfur marine fuel

Abstract

The invention discloses a production method of gasoline and low-sulfur marine fuel. The production method comprises the following steps: (1) carrying out hydrogenation reaction on a residual oil raw material in the presence of hydrogen and a hydrotreating catalyst; (2) carrying out gas-liquid separation on an effluent of the hydrogenation reaction, circulating a gas phase to the hydrogenation reaction in the step (1), taking a liquid phase as mixed hydrogenation generated oil, not fractionating the mixed hydrogenation generated oil, throwing a part of the mixed hydrogenation generated oil as low-sulfur marine fuel, feeding the rest of the mixed hydrogenation generated oil into a catalytic cracking device, and carrying out catalytic cracking reaction; and (3) mixing a catalytic cracking heavy fraction obtained after dry gas, liquefied gas and catalytic cracking gasoline are separated from the effluent of the catalytic cracking reaction, used as heavy cycle oil, with the residual oil raw material in the step (1) for hydrogenation reaction. The combined process provided by the invention can be used for producing high-octane catalytic cracking gasoline and low-sulfur marine fuel products to the maximum extent. Meanwhile, hydrogenation load is reduced, a catalytic cracking fractionation system is simplified, and equipment investment and operation energy consumption are reduced.

Description

technical field [0001] The invention relates to a method for lightening residual oil, in particular to a process for mainly producing gasoline and low-sulfur marine fuel by using low-quality high-sulfur residual oil as raw materials. Background technique [0002] With the increasingly stringent global environmental protection regulations, clean low-sulfur marine fuel oil will become one of the key oil products in the next few years after the upgrading of clean gasoline and diesel and other light oil products. The International Maritime Organization (IMO) "International Convention for the Prevention of Pollution from Ships" stipulates that from January 2020, the sulfur mass fraction of marine fuel oil used for navigation in general areas of the sea will be reduced from the current not more than 3.5% to not more than 0.5%; when sailing in emission control areas, the sulfur content of marine fuel should not exceed 0.1%. In the marine fuel oil demand market, high-sulfur residua...

AI Technical Summary

Problems solved by technology

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 indicators, other indicators such as carbon residues are greatly reduced, viscosity is greatly reduced, and the processing cost is high.

Liquefied petroleum gas and catalytic cracking gasoline are ideal components, but catalytic cracking diesel is rich in aromatics and difficult to process

[0007] The existing residual oil hydrotreating and catalytic cracking combined process has problems such as low gasoline yield, difficult diesel processing, insufficient utilization of re-refined oil and oil slurry, and poor economic benefits.

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