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Hydrotreatment method for coal tar

A technology for hydrogenation treatment and coal tar, which is applied in the fields of hydrogenation treatment process, hydrocarbon oil treatment, petroleum industry, etc. It can solve the problem of low impurity removal rate, achieve the effect of ensuring product quality and reducing operating costs

Active Publication Date: 2015-06-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the ebullating bed has strong adaptability to raw materials, it requires the gas-liquid flow rate to be within a certain operating range to keep the catalyst in the reactor in a boiling state, which is highly dependent on the composition, flow rate, properties and catalyst properties of the stream in the reactor, and has a certain operating limitations, and the impurity removal rate of ebullating bed is relatively low compared with fixed bed

Method used

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  • Hydrotreatment method for coal tar

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Embodiment approach

[0033] The serial number 1 is the raw material tank, 2 is the pre-hydrogenation reactor, 3 is the separation device, 4 is the hydrodemetallization reactor, 5 is the deep hydrofining reactor, 6 is the separation device, and 7 is the hydrocracking reactor , 8 is a distillation unit, 9 is water, 10 is gasoline, 11 is diesel oil, 12 is hydrocracking tail oil, 13 is hydrogen, and the rest are pipelines.

[0034] Schematic diagram of the principle process flow of coal tar hydrotreating to produce light fuel oil ( figure 1 ): Firstly, the coal tar raw material in the raw material tank 1 is mixed with hydrogen and enters the pre-hydrogenation reactor for hydrogenation and saturation of unsaturated hydrocarbons. The pre-hydrogenation reactor adopts a magnetically stable bed reactor, and the reactor is filled with a ferromagnetic hydrogenation catalyst. The catalyst is a catalyst composed of a magnetic carrier loaded with a hydrogenation active metal composed of magnetic particles. The ...

Embodiment 1

[0038] This example is a hydrogenation test of high-temperature coal tar distillate oil in the coal tar hydrogenation process. The magnetically stabilized bed reactor for pre-hydrogenation adopts the upflow operation mode, and the other reactors adopt the gas-liquid parallel flow downflow operation mode. . Among them, the properties of coal tar raw materials are: Density (20°C): 1.1365 g / cm 3 ;Charcoal residue: 3.4%; Sulfur: 6000μg / g; Nitrogen: 10000μg / g, saturated content: 0%; aromatic content: 69.1%; colloid: 27.9%, asphaltene: 3%; mechanical impurity content: 1.8% . First, the coal tar raw material in the raw material tank 1 is mixed with hydrogen and then enters the magnetically stabilized bed prehydrogenation reactor for hydrodeoxygenation and unsaturated hydrocarbon hydrogenation reaction. The mechanical impurity content in the prehydrogenation reaction effluent is 0.9%. The hydrogen reaction effluent is separated into fine solid particles by a centrifugal separation d...

Embodiment 2

[0044] This example is a hydrogenation test of high-temperature coal tar whole distillates in the coal tar hydrogenation process. Among them, the properties of the whole fraction of coal tar are: Density (20°C): 1.1653 g / cm 3 ; Residual carbon: 23.4%; Sulfur: 6800μg / g; Nitrogen: 12000μg / g; Saturated content: 0.17%; Aromatic component: 33.1%; Colloid: 10.73; The operation process of this test is basically the same as that of Example 1. The content of mechanical impurities in the pre-hydrogenation reaction effluent is 3.0%, and the pre-hydrogenation reaction effluent is filtered (CLBY-302A automatic backwash filter produced by Beijing Kelijie Water Industry) to separate fine solid particles. The mechanical impurity content is lower than 10μg / g. The reaction conditions and test results are shown in Table 3 and Table 4.

[0045] Table 3 Reaction conditions

[0046] Numbering Example 2 prehydrogenation reaction temperature, ℃ 235 pressure, MPa 6 ...

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Abstract

The invention discloses a hydrotreatment method for coal tar. The method disclosed by the invention comprises the following steps of: pumping coal tar which is high in the contents of impurities, colloid, asphaltene, oxygen element and the like into a prehydrogenation reactor, and then performing hydrogenation pre-treatment; filtering to separate out tiny impurities suspended in the generated oil; sequentially performing hydrodemetallization reaction and deep hydrofining reaction; separating out water and light-weight components from the material flow generated by the reactions, and conveying the water and the light-weight components in a hydrocracking reactor; and then cutting out gasoline fraction, diesel oil and hydrocracking tail oil via a distillation device, wherein a magnetic catalyst is filled in the prehydrogenation reactor, and the operation is performed by means of a magnetically stabilized bed. Compared with the prior art, with the adoption of the method disclosed by the invention, the long-period stable running of the device can be ensured.

Description

technical field [0001] The invention relates to a coal tar hydrogenation treatment method, in particular, the coal tar distillate oil or coal tar whole distillate is used as a raw material, and the multi-stage hydrogenation process of magnetically stabilized bed pretreatment and fixed bed catalyst grading loading is used to produce clean and light Fuel process. Background technique [0002] Coal tar is a by-product of coal coking, carbonization and gasification. Coal tar is different from natural petroleum in that it has a complex composition, high content of polycyclic aromatic hydrocarbons, colloids and asphaltenes, a large amount of oxygen-containing polar substances and a certain amount of unsaturated hydrocarbons and impurities such as sulfur, nitrogen and metals. At the same time, coal tar contains a large number of fine inorganic impurities and organic impurities. The inorganic impurities are mainly iron filings and oxide powders with a particle diameter of about 10 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
Inventor 贾丽陈永光
Owner CHINA PETROLEUM & CHEM CORP
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