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A kind of coal tar hydrogenation upgrading method

A technology of hydrogenation upgrading and coal tar, which is applied in the fields of hydrogenation treatment process, hydrocarbon oil treatment, petroleum industry, etc., can solve the problems of high proportion, reduce the yield of naphtha and diesel oil, etc., and increase the yield , to achieve comprehensive utilization and reduce the effect of coking

Active Publication Date: 2016-07-27
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The proportion of fractions > 360°C in coal tar is high (usually up to 50% by weight), and the use of fractions > 360°C in coal tar for coking or delayed coking will undoubtedly greatly reduce the yield of naphtha and diesel

Method used

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  • A kind of coal tar hydrogenation upgrading method
  • A kind of coal tar hydrogenation upgrading method
  • A kind of coal tar hydrogenation upgrading method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The coal tar used in this example is a low-temperature coal tar, and its properties are listed in Table 2.

[0056] Table 2

[0057] Density (20℃), g / cm 3

1.05

Sulfur, mg / kg

2100

Nitrogen, mg / kg

8200

Oxygen content, wt%

4.16

Viscosity (50℃), mm 2 ×s -1

7.45

Asphaltenes, wt%

17.8

[0058] use figure 1 The process shown is for hydrotreating and upgrading of coal tar.

[0059] (1) Using a real boiling point distillation apparatus, 1 kg of coal tar is fractionated and cut to obtain the first component and the heavy component. The content of the component is 60% by weight. The properties of the resulting first and heavy fractions are listed in Table 3.

[0060] (2) Mix the heavy component obtained in step (1) with n-pentane at a weight ratio of 1:6 for extraction and separation to obtain an extract phase and a raffinate phase. Wherein, the extraction conditions include: the temperature is 50° ...

Embodiment 2

[0066] The same method as in Example 1 is used to carry out hydrogenation and upgrading of coal tar, the difference is that according to image 3 The process flow shown is carried out. In step (2), the heavy component is mixed with the naphtha obtained in step (3) in a weight ratio of 1:3, and the obtained mixture is mixed with n-pentane in a weight ratio of 1:3. extraction.

[0067] The properties of the obtained first fraction, heavy fraction and deasphalted oil are listed in Table 3. In step (3), based on the total amount of coal tar as a raw material, the total yield of naphtha and diesel oil is 80% by weight; the hydrogenation unit can still run continuously for more than 500 hours without changing the catalyst. Obtain naphtha and diesel oil of up to standard quality.

Embodiment 3

[0069] Coal tar is hydrogenated and upgraded in the same way as in Example 2, the difference is that in step (1), the fractionation cutting temperature is 380°C; based on the total amount of coal tar used as raw material, the content of heavy components is 55% by weight; in step (2), the extraction is carried out under the supercritical state of the extractant, and the specific conditions are: the temperature is 175° C., and the pressure is 4.5 MPa.

[0070] The properties of the obtained first fraction, heavy fraction and deasphalted oil are listed in Table 3. In step (3), based on the total amount of coal tar as a raw material, the total yield of naphtha and diesel oil is 90% by weight; the hydrogenation unit can still run continuously for more than 500 hours without changing the catalyst. Obtain naphtha and diesel oil of up to standard quality.

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Abstract

The invention discloses a method for hydrogenation and upgrading of coal tar. The method comprises the following steps: fractionating and cutting coal tar to obtain a first component whose cutting temperature is not higher than the cutting temperature of fractionation cutting and a first component whose cutting temperature is higher than the cutting temperature of fractionation cutting. For the heavy component, the cutting temperature of the fractionation cut is not higher than 600°C; the heavy component is extracted and separated with an extractant to obtain deasphalted oil; under the condition of hydrotreating, the deasphalted oil and the first component contact with a hydrogenation catalyst. The method effectively increases the amount of raw material for hydrogenation, increases the yield of naphtha and diesel oil, and can realize the comprehensive utilization of coal tar. This method can also effectively reduce the amount of coking formed on the surface of the hydrogenation catalyst and prolong the service life of the hydrogenation catalyst. Even if the hydrogenation treatment is carried out in a fixed-bed reactor, the hydrogenation unit can run stably for a long time and obtain low-sulfur nitrogen content of naphtha and diesel, and the resulting diesel has a high cetane number.

Description

technical field [0001] The invention relates to a coal tar hydrogenation upgrading method. Background technique [0002] Coal tar is a viscous liquid obtained during the dry distillation of coal. For the processing and utilization of coal tar, the current conventional methods are divided into two categories: one is physical separation and extraction of chemicals, and the other is hydrogenation to produce liquid fuels. With the increasing scarcity of petroleum resources, the hydroprocessing of coal tar to produce liquid fuels (such as diesel) has attracted more and more attention. [0003] CN1597866A discloses a method for producing chemicals and fuel oil from coal tar. The method combines the hydrofinishing process with the coking process or the hydrofinishing process with the delayed coking process, and adds a preventive heating furnace tube and reactor Coke formation inhibitor for bed coke to produce phenol, naphthalene and fuel oil, specifically including: (I) Distillin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
Inventor 陈松王理郭小汾张新锋赵俊鹏
Owner CHNA ENERGY INVESTMENT CORP LTD
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