Process for preparing needle coke raw material by using medium and low temperature coal tar and high temperature pitch

A technology of needle coke raw material and high-temperature asphalt, which is applied in the processing of tar asphalt/petroleum asphalt/natural asphalt, tar processing, and chemical processing of tar asphalt/petroleum asphalt/natural asphalt, etc. Preparation of needle coke and other issues to achieve high quality, improve catalytic efficiency, and improve economic efficiency

Active Publication Date: 2012-11-21
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, medium and low temperature tar cannot be used to prepare needle coke, and a process for preparing needle coke raw material by using medium and low temperatur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] The process for preparing needle coke raw materials using medium and low temperature tar and high temperature pitch described in this example includes:

[0035] (1) Distill the medium and low temperature tar in the distillation tower to separate the heavy fraction above 350°C;

[0036] Each index of described heavy distillate is as follows:

[0037] QI: 3.2wt%, TI: 5.6wt%, S concentration: 0.26wt%.

[0038] (2) Send the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt into the hydrogenation reactor, and perform hydrogenation heat on the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt in the presence of an iron-based catalyst Decomposition, the quality of the iron-based catalyst accounts for 0.01% of the sum of the heavy fraction of the medium and low-temperature tar and the quality of high-temperature pitch; the iron-based catalyst described i...

Example Embodiment

[0046] Example 2

[0047] The process for preparing needle coke raw materials using medium and low temperature tar and high temperature pitch described in this example includes:

[0048] (1) Distill the medium and low temperature tar in the distillation tower to separate the heavy fraction above 350°C;

[0049] Each index of described heavy distillate is as follows:

[0050] QI: 2.9 wt%, TI: 5.2 wt%, S: 0.24 wt%.

[0051] (2) Send the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt into the hydrogenation reactor, and add the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt in the presence of an iron-based catalyst Hydrogen thermal decomposition, the quality of the iron-based catalyst accounts for 3% of the sum of the heavy fraction of medium and low-temperature tar and the quality of high-temperature pitch, and the iron-based catalyst described in this embodiment is...

Example Embodiment

[0059] Example 3

[0060] The process for preparing needle coke raw materials using medium and low temperature tar and high temperature pitch described in this example includes:

[0061] (1) Distill the medium and low temperature tar in the distillation tower to separate the heavy fraction above 350°C;

[0062] Each index of described heavy distillate is as follows:

[0063] QI: 2.9 wt%, TI: 5.2 wt%, S: 0.24 wt%.

[0064] (2) Send the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt into the hydrogenation reactor, and perform hydrogenation heat on the mixture of the heavy fraction of the medium and low temperature tar and the high temperature asphalt in the presence of an iron-based catalyst Decomposition, the quality of the iron-based catalyst accounts for 0.8% of the sum of the heavy fraction of medium-low temperature tar and the quality of high-temperature pitch, and the iron-based catalyst described in this embodi...

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Abstract

The invention relates to a process for preparing a needle coke raw material by using medium and low temperature coal tar and high temperature pitch, which comprises the following steps: 1) distilling the medium and low temperature coal tar, separating to obtain heavy distillate with the temperature more than 350DEG C; 2) sending the heavy distillate of the medium and low temperature coal tar in a reactor, under the existence of a catalyst, introducing hydrogen in the reactor, performing hydropyrolysis on the heavy distillate, wherein the catalyst is a Fe catalyst and the mass of the catalyst accounts for 0.01-3% of mass of the heavy distillate; the pressure during the hydropyrolysis is 7-12 MPa and the temperature is 350-550 DEG C; 3) sending the products after hydropyrolysis in the step 2) in a separator, and separating to obtain lower oil and higher oil; and 4) performing physical separation on the higher oil, and removing the catalyst. According to the hydropyrolysis treatment of the medium and low temperature coal tar, the content of condensed polycyclic aromatic hydrocarbons can be greatly increased and the raw material suitable for preparing needle coke can be obtained.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a process for preparing coal-based needle coke raw materials from coal tar. Background technique [0002] Needle coke is a high-quality material for manufacturing high-power and ultra-high-power electrodes. Graphite electrodes made of needle coke have strong thermal shock resistance, high mechanical strength, good oxidation performance, low electrode consumption and large allowable current density, etc. advantage. At present, needle coke has been widely used in high-tech fields such as electric furnace steelmaking, manufacturing deceleration materials for nuclear reactors, and manufacturing ultra-high-power electrodes for rocket launches. [0003] The needle coke currently produced can be divided into petroleum-based needle coke and coal-based needle coke according to the different raw materials used, but both coal-based and petroleum-based needle coke have the ...

Claims

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Application Information

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IPC IPC(8): C10C1/04C10C1/00C10C3/00C10C3/02C10G67/02
Inventor 井口宪二坂脇弘二
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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