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Coal tar hydrogenation method

A coal tar and pre-hydrogenation technology, which is applied in the field of coal tar hydrogenation, can solve the problems of easy blockage of the protective reactor, low removal rate of impurities in the stream, and influence on the stable operation of the device, so as to avoid condensation and carbon deposition of polycyclic aromatic hydrocarbons , reduce equipment investment, improve the effect of scale capacity

Active Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a protection reactor is installed in front of the hydrotreating reactor in this process, if the protection reactor is operated with a fixed bed, it is easy to be blocked, and if it is operated with a suspended bed, it will be difficult to separate the tail oil containing solids. The problem of low removal rate of impurities in the post-hydrogen stream. For example, if the fluidized bed operation is used, the gas-liquid flow rate must be controlled within the specified operating range. If the gas-liquid flow rate is not within the control range, the stable operation of the device will be affected.

Method used

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  • Coal tar hydrogenation method

Examples

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Effect test

Embodiment approach

[0036] 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.

[0037] 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 stream is filtered or separated by a separation device (such as a centrifugal separator) to separate the fine solid particles suspended in the product stream, and then enters the hydrodemetallization reactor to go straight to the demetallization reaction. ...

Embodiment 1-2

[0048] This example is a hydrogenation test of high-temperature coal tar distillate oil in the coal tar hydrogenation process. The ebullated bed reactor for pre-hydrogenation adopts an upflow operation mode, and the other reactors adopt a 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 , carbon 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 ebullated bed pre-hydrogenation reactor for hydrodeoxygenation and unsaturated hydrocarbon hydrogenation reaction. The mechanical impurity content in the pre-hydrogenation reaction effluent is 1.3%, and the pre-hydrogenation The reaction effluent is separated into fine solid particles by a centrifugal separation device (LW220 hor...

Embodiment 3～4

[0054] 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 , carbon residue: 23.4%; sulfur: 6800μg / g, nitrogen: 12000μg / g, saturated content: 0.17%; aromatic content: 33.1%; pectin: 10.73, asphaltene: 56%; mechanical impurity content: 4.8%. The operation process of this test is basically the same as that of Example 1, except that in the pre-hydrogenation reactor, the particulate catalyst packed in the inert cage of the reaction section from the stream inlet to 1 / 3rd of the inlet accounts for 35% of the cage volume , in addition the catalyst occupies 65% of the cage volume. The content of mechanical impurities in the pre-hydrogenation reaction effluent is 3.7%, and the pre-hydrogenation reaction effluent is filtered (CLBY-302A automatic backwash filter produced by Beijing Kelijie Water Industry) to separate fine ...

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Abstract

The invention discloses a coal tar hydrogenation method. The method consists of: char pumping coal tar having a high content of impurities, colloids, asphaltene, oxygen element and the like into a pre-hydrogenation reactor to undergo a hydrogenation pretreatment, conducting filtering to separate tiny impurities suspending in the generated oil, then carrying out a hydrodemetallization reaction and a deep hydrofining reaction in order, separating water and a component from the generated effluent, and leaving a heavy component to enter a hydrocracking reactor, then passing the product through a distillation device, and carrying out cutting to obtain gasoline fraction, diesel oil and hydrocracking tail oil. Specifically, the pre-hydrogenation reactor is loaded with two matters in different specifications, i.e. a metal cage for keeping a fixed bed and a particulate catalyst positioned in the space formed by the metal cage. Compared with the prior art, the method provided in the invention can ensure long-period stable operation of the equipment.

Description

technical field [0001] The invention relates to a method for hydrogenation of coal tar, in particular to a process for producing clean light fuel by using a multi-stage hydrogenation process of catalyst gradation loading with distillate oil of coal tar or whole fraction of coal tar as a raw material. 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 μm. Polymers, the above-mentioned fine impurities are evenly d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
Inventor 贾丽孟兆会
Owner CHINA PETROLEUM & CHEM CORP
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