Method for processing inferior residual oil

Abstract

The invention relates to the field of residual oil processing, and discloses a method for processing inferior residual oil, which comprises the following steps: vacuum residual oil is introduced into a first separator for countercurrent contact with a solvent contained in the vacuum residual oil, and a first tower top material flow and a first tower kettle material flow are respectively obtained; the first tower top material flow is introduced into a second separator to be in countercurrent contact with a solvent contained in the second separator, and a second tower top material flow and a second tower kettle material flow are obtained respectively; hydrotreating is carried out on the second tower kettle material flow to obtain a hydrogenated material flow; and delayed coking treatment is carried out on the hydrogenation material flow to obtain an anode coke product. According to the method, efficient utilization of the inferior residual oil is achieved, the utilization rate and the utilization value of the inferior residual oil are improved to the maximum extent, and the anode coke obtained through production has high quality.

Description

technical field [0001] The invention relates to the field of hydrocarbon oil processing, in particular to a method for processing inferior residue oil. Background technique [0002] With the rapid development of the electrolytic aluminum industry, the demand for aluminum prebaked anode coke has risen sharply, and the aluminum prebaked anode coke industry has gradually become a new investment growth point. [0003] Generally speaking, when the sulfur content of petroleum coke is relatively low, the anode consumption decreases with the increase of sulfur content, because sulfur increases the coking rate of asphalt and reduces the porosity of asphalt coking; at the same time, sulfur is also combined with metal impurities, reducing The catalytic effect of metal impurities, but if the sulfur content is too high, the thermal brittleness of the carbon anode will be increased, and because the sulfur is mainly converted into the gas phase in the form of oxides during the electrolysis...

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Problems solved by technology

[0007] However, the anode paste produced by using medium-temperature asphalt as raw material produces relatively large flue gas due to high volatile content during use, which pollutes the environment; when using high-temperature asphalt as raw material , due to the high sulfur content, high metal content and high carbon residue value in high-temperature asphalt, it is easy to generate shot coke during coke formation, and the produced coke emits SOx during use, which affects the environment

[0008] CN1349955A discloses a production method of clean anode coke, which proposes to mix the raw material petroleum coke and medium-temperature pitch evenly, use an electromagnetic separator to remove impurities, grind, Forming, roasting at 1000-1300°C for 12-24 hours, and the mature anode coke is cooled by a cooling tower to obtain a clean anode coke product; while the electromagnetic separator only has the effect of separating free metal impurities, and is effective for metal compounds or sulfur, etc. no separation effect

[0009] At present, there is no suitable process to treat the vacuum residue with poor properties, so that it can be used as a raw material for the production of high-quality anode coke: fixed bed residue can be removed by hydrogenation Sulfur and metals in the vacuum residue, but considering the construction cost of the hydrogenation unit, hydrogen consumption, and the service life of the catalyst, its economy is poor

In addition, the vacuum residue is used as coking feed after hydrogenation, and the saturation of the feed to the coking unit is greatly increased. The volatile carbon-containing substances, stack ratio, and moldability of the anode coke produced are difficult to meet the quality requirements of the anode coke.

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