Method for producing diesel oil from coal tar
A technology of coal tar and diesel oil, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrogenation process, etc., can solve the problems of low added value, environmental pollution, waste of resources, etc., to reduce waste of raw materials, reduce production costs, and reduce pollution Effect
Active Publication Date: 2015-02-04
GUANGHAN TIANZHOU AERO ENGINE FUEL TECH CO LTD
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Problems solved by technology
So far, the national coal tar production has exceeded 15 million tons per year, but the actual deep processing of coal tar is less than 8 million tons per year, which is a serious waste of resources
[0004] At present, most domestic enterprises sell coal tar directly, which not only has low added value, but also causes great pollution to the environment.
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[0024] In this example, the catalyst added to the slurry bed reactor is a Co-Mo type hydrogenation catalyst, and the catalyst added to the fixed bed reactor is a Ni-W type hydrogenation catalyst. The physical and chemical properties of the two catalysts are as follows in Table 1:
[0025] Table 1
[0026] Co-Mo type hydrogenation catalyst Ni-W type hydrogenation catalyst Specific surface area, m 2 / g 287 120 Pore volume, mL / g 0.85 0.37 Possible pore size, nm 11.8 7.2 carrier γ-Al 2 o 3 γ-Al 2 o 3 Cobalt oxide, % 4.7 / Molybdenum oxide, % 15.2 / Nickel oxide,% / 4.2 Tungsten oxide, % / 27.4
[0027] In the embodiment, the properties of the whole fraction of coal tar are shown in Table 2:
[0028] Table 2
[0029] Density at 20°C / (kg / m 3 ) 1.058 Viscosity at 50℃ / (mm 2 / s) 93.46 O content / % 8.50 C content / % 82.71 H content / % 8.35 S content / % 0.26 ...
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The invention discloses a method for producing diesel oil from coal tar, and solves the problem that the existing fuel oil causes great environmental pollution. The method disclosed by the invention comprises the following steps of: (1) conveying the full-fraction of coal tar in a reduced-pressure fractionating tower, controlling the tower bottom temperature of the reduced-pressure fractionating tower to be not higher than 250 DEG C, and dividing the full-fraction of coal tar into light-component coal tar and heavy-component coal tar, wherein the difference between the hydrogen contents of the light-component coal tar and the heavy-component coal tar is not greater than 1.5%; (2) mixing the heavy-component coal tar with hydrogen, conveying the mixture in a slurry bed reactor, and performing hydrogenation reaction under the action of a slurry bed catalyst; (3) mixing the efflux obtained after the reaction of the slurry bed reactor with the light-component coal tar, conveying the mixture in a fixed bed reactor, and performing hydrogenation reaction under the action of a fixed bed catalyst; and (4) performing gas-liquid separation on the efflux obtained after the reaction of the fixed bed reactor, flowing the liquid substance in the fractionating tower, further dividing the diesel oil fraction, and then obtaining the clean diesel oil.
Description
technical field [0001] The invention relates to a method for producing diesel oil from coal tar. Background technique [0002] Coal tar is an organic mixture dominated by aromatic hydrocarbons. It can be processed into various chemicals and high-quality fuel oil. Coal tar is an important by-product of coking industry and coal gasification industry. With the continuous in-depth development of my country's economic construction, especially the iron and steel industry, the coking industry has also developed rapidly, and now my country has developed into the world's largest producer of coke and coal tar. So far, the national coal tar production has exceeded 15 million tons per year, but the actual deep processing of coal tar is less than 8 million tons per year, which is a serious waste of resources. With the development of coal coking industry, the output of coal tar is increasing, so the clean processing of coal tar has a profound impact on my country's economic developmen...
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IPC IPC(8): C10G67/00
Inventor 吴建明
Owner GUANGHAN TIANZHOU AERO ENGINE FUEL TECH CO LTD