Technique for hydrogenation of coal oil

A process method, coal tar technology, applied in tar processing, hydrotreating process, petroleum industry, etc., can solve problems such as deposition, affecting device operation cycle, and rise in pressure drop of reactor bed

Active Publication Date: 2009-01-14
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, a catalyst with a single activity and pore size distribution is used in the protection reactor, and the impurities that come off are easily deposited on the catalyst bed, causing the reactor bed The pressure drop rises rapidly, affecting the operating cycle of the device

Method used

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  • Technique for hydrogenation of coal oil
  • Technique for hydrogenation of coal oil
  • Technique for hydrogenation of coal oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0027] 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.

[0028] Schematic diagram of the principle process for producing light fuel oil by multi-stage hydrotreating of coal tar ( figure 1 ): First, the coal tar raw material in the raw material tank 1 is mixed with hydrogen and enters a pre-hydrogenation reactor for hydrogenation 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, and goes straight to the demetallization r...

Embodiment 1-2

[0037] This example is a hydrogenation test of high-temperature coal tar distillate oil using a multi-stage combined process of graded loading, and each reactor adopts the operation mode of gas-liquid parallel flow and downward flow. Among them, the properties of coal tar raw materials are: Density (20°C): 1.1365g / 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 raw material tank 1 is mixed with hydrogen and then enters the fixed bed prehydrogenation reactor for hydrodeoxygenation and unsaturated hydrocarbon hydrogenation reaction. The mechanical impurity content in the prehydrogenation reaction effluent is 1.7%. The reaction effluent is separated into fine solid particles by a centrifugal separation device (LW220 horizontal screw sedimentation centrifuge produced by Taixing Gaoda Centrifuge Co., Ltd.), and ...

Embodiment 3-4

[0044] This example is a hydrogenation test of high-temperature coal tar whole distillates using a multi-stage combined process of graded packing. Among them, the properties of the whole fraction of coal tar are: Density (20°C): 1.1653g / cm 3 , carbon residue: 23.4%; sulfur: 6800μg / g, nitrogen: 12000μg / g, saturated content: 0.17%; aromatic content: 33.1%; pectin: 10.73, asphaltenes: 56%; mechanical impurity content: 4.8%. The operation process of this test is basically the same as that of Example 1, except that the composition of the catalyst in the pre-hydrogenation reactor is: FZC-102: Catalyst B: Catalyst C ratio is 30:40:30. The content of mechanical impurities in the pre-hydrogenation reaction effluent was 4.7%, and the pre-hydrogenation reaction effluent was filtered (CLBY-302A type 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...

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Abstract

The invention discloses a coal tar hydrogenation processing method. The method of the invention comprises the steps that coal tar distillated oil or a full distillating pump with high content of impurities, colloid, asphaltene and oxygen elements is fed into a pre-hydrogenating reactor, the hydrogenation pre-treatment is performed under a certain reaction condition, the tiny impurities suspending in oil are separated through a separating device such as a filter and the like, then hydrogenating demetalization and deep hydrogenation refined reaction are performed in sequence, after water and light component are separated, and the material flow generated by the reaction enters into the hydrocracking reactor, thus gasoline fraction, diesel oil and hydrocracking tail oil are cut through a distilling device. Compared with the prior art, the method of the invention can ensure the device of long period of stable operation.

Description

technical field [0001] The invention relates to a coal tar hydrogenation process, in particular to a process for producing a 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 powder with a particle diameter of about 10 μm, and the organic impurities are mainly high-temperature thermal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/00C10G65/04
Inventor 贾丽杨涛葛海龙李鹤鸣贾永忠刘建锟
Owner CHINA PETROLEUM & CHEM CORP
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