Hydrogenation pretreatment method of coal tar

A technology for hydrotreating pretreatment and coal tar, applied in hydrotreating process, treating hydrocarbon oil, petroleum industry, etc., can solve the problems of hindering the sustainable development of hydroprocessing, restricting the operation period of the main hydrotreating unit, and high metal content. Suitable for large-scale promotion and application, easy to fully separate, and ensure the effect of long-term operation

Active Publication Date: 2015-06-03
GUANGHAN TIANZHOU AERO ENGINE FUEL TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coal tar hydrogenation pretreatment method, which mainly solves the high metal content in the whole fraction of coal tar existing in the prior art, which seriously restricts the operation cycle of the main hydrogenation unit and hinders the hydrogenation process. Machining issues of continued development

Method used

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  • Hydrogenation pretreatment method of coal tar

Examples

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Effect test

Embodiment 1

[0027] In order to solve the problem that the high metal content in the full fraction of coal tar existing in the prior art seriously restricts the operation period of the main hydrogenation unit and hinders the sustainable development of hydrogen processing, such as figure 1 As shown, the present invention discloses a coal tar hydrogenation pretreatment method. After mixing coal tar and hydrogen at a relatively low reaction pressure, the mixture is first passed into a slurry bed hydrogenation reactor at high temperature and high space velocity. Then pass it into a fixed-bed hydrogenation reactor at low temperature and low space velocity, and finally produce refined coal tar with a total metal content not higher than 2 μg / g. It has been verified that the present invention is especially suitable for coal tar raw materials with high asphaltene content. processing.

[0028] Concrete implementation method of the present invention is as follows:

[0029] After mixing coal tar and ...

Embodiment 2

[0049] The difference between this example and Example 1 is that the operating conditions of the slurry bed reactor are: the average reaction temperature is 320°C, the hydrogen partial pressure is 3MPa, and the space velocity is 1.0h -1 , the volume ratio of hydrogen to oil is 600; the operating conditions of the fixed bed reactor are: the average reaction temperature is 280°C, the hydrogen partial pressure is 3.0MPa, and the fresh raw material space velocity is 0.5h -1 , the volume ratio of hydrogen to oil is 600, and it has been verified that the metal content in coal tar is lower than 1.5 μg / g.

Embodiment 3

[0051] The difference between this example and Example 1 is that the operating conditions of the slurry bed reactor are: the average reaction temperature is 480°C, the hydrogen partial pressure is 8MPa, and the space velocity is 5.0h -1 , the volume ratio of hydrogen to oil is 800; the operating conditions of the fixed bed reactor are: the average reaction temperature is 380°C, the hydrogen partial pressure is 8.0MPa, and the fresh raw material space velocity is 1.0h -1 , the volume ratio of hydrogen to oil is 800, and it has been verified that the metal content in coal tar is lower than 0.9 μg / g.

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Abstract

The invention discloses a hydrogenation pretreatment method of coal tar, which is mainly used for solving the problems that the metal content in whole fraction of the coal tar in the prior art is very high, the operation period of a main hydrogenation device is strictly restricted, and the sustained development of hydrogen processing is hindered. The hydrogenation pretreatment method of the coal tar comprises the following steps of mixing the coal tar with hydrogen at relatively low reaction pressure, then firstly introducing a mixture into a slurry bed hydrogenation reactor at high temperature and high air speed, then introducing into a fixed bed hydrogenation reactor at low temperature and low air speed, and finally introducing into a gas-liquid separation system for separation. Through the scheme, the purposes of effectively ensuring the long-period operation of the main hydrogenation device and the sustained development of hydrogen processing are achieved, and the method further has very high practical application and popularization values.

Description

technical field [0001] The invention relates to a coal tar hydrogenation pretreatment method. Background technique [0002] Coal tar is one of the important products of the coking industry. Its output accounts for about 3% to 4% of the furnace coal. Its composition is extremely complex, mainly aromatic hydrocarbons. In most cases, it is specially separated and purified by the coal tar industry. Take advantage of it. Coal tar can be further processed to separate various chemicals and can also be processed into high-quality fuel oil. [0003] 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. Now my country has developed into the world's largest producer of coke and coal tar. By the end of 2012, the national coal tar production had exceeded 25 million tons. / year, however, the actual amount of deep processing of coal tar in my country is less than 8 million to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/04
Inventor 吴建明
Owner GUANGHAN TIANZHOU AERO ENGINE FUEL TECH CO LTD
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