Coal tar processing method

A treatment method, coal tar technology, applied in the treatment of hydrogen-generating compounds, etc., can solve the problems of incomplete utilization of coal tar, fast coking of the catalyst, and influence on the operation cycle, so as to improve the fusion effect and reaction effect, and improve the reaction effect , the effect of effective processing

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0006] CN1331130A introduces a method for producing diesel oil by hydrogenation of coal tar, mainly through fractionation of coal tar, the fraction below the diesel oil obtained is hydrotreated, and can directly produce diesel oil that meets the fuel oil index or as a blending component of diesel products. But it only hydrotreats the lighter fraction of coal tar, and does not fully utilize coal tar
However, the process is complicated, the cost is high, and the catalyst cokes quickly, which affects the operation cycle

Method used

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Examples

Experimental program
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Effect test

Embodiment -1

[0022] Coal tar and tetralin are added to the static mixer, (keep excess tetralin, the weight ratio of coal tar and tetralin to oil agent ratio is 1: 6), and then after the material is heated, it enters the CSTR (continuous stirred tank reactor ), pressurize, heat up and start stirring at a speed of 800 rpm, pressurize to 20MPa, heat up to 400°C, and the reaction time is 3h. The reacted product enters the separator after being filtered, and the gas phase and liquid phase are separated. The solid impurities separated by filtration can be burned or used as the raw material of needle coke, and the liquid phase is subjected to hydroprocessing and fractionation operations. The hydrogenation treatment adopts the commercial hydrogenation treatment catalyst 3996 developed and produced by Fushun Petrochemical Research Institute. The hydrogenation treatment process conditions are: total pressure 16MPa, average reaction temperature 380℃, volume space velocity 0.4h -1 , The volume ratio o...

Embodiment -2

[0024] Coal tar is used as raw material, the steps are the same as in Example-1, the hydrogen-donating solvent is decahydronaphthalene, the weight ratio of coal tar and hydrogen-donating solvent is 1:2, the reaction pressure is 35MPa, the reaction temperature is 450°C, and the reaction time is 0.5h (CSTR is continuous feeding and discharging, and the reaction time is the average residence time of materials). The hydrogenation treatment adopts the commercial hydrogenation treatment catalyst 3996 developed and produced by Fushun Petrochemical Research Institute. The hydrogenation treatment process conditions are: total pressure 14MPa, average reaction temperature 390℃, volume space velocity 0.2h -1 , The volume ratio of hydrogen to oil is 1500:1. After being processed by the method of the present invention, the properties of the diesel oil obtained by the fractionation tower are shown in Table 3.

Embodiment -3

[0026] By the same method as in Example 2, water is added simultaneously, and the weight ratio of water and residual oil raw material is 1:1. The hydrogenation treatment adopts the commercial hydrogenation treatment catalyst 3996 and FC-28 developed and produced by Fushun Petrochemical Research Institute in a volume ratio of 2:1. The reaction material first passes through the 3996 catalyst and then passes through the FC-29 catalyst. : Total pressure 16MPa, average reaction temperature 385℃, total volume space velocity 0.5h -1 , The volume ratio of hydrogen to oil is 2000:1. The properties of the diesel obtained from the anti-fractionation tower are shown in Table 3.

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Abstract

The invention discloses a coal tar processing method which comprises the following steps: mixing coal tar and a hydrogen-donor solvent, wherein the hydrogen-donor solvent comprises tetrahydronaphthalene or decahydronaphthalene, and the weight ratio of the coal tar to the hydrogen-donor solvent is (1:0.5)-(1:10); processing the mixture of the coal tar and the hydrogen-donor solvent for 0.2-5 hoursat the pressure of 15-40 MPa and the temperature of 200-500 DEG C; separating solid impurities from the processed product; and then, hydrogenating. The coal tar processing method provided by the invention is implemented in the supercritical state or approximately-critical state of the hydrogen-donor solvent, thus the mixing effect and reaction effect of the hydrogen-donor solvent and the coking precursor in the coal tar are improved, the coking tendency is reduced, the comprehensive reaction effect is enhanced in combination with hydrogenation, the impurity removing capability and long-term operation stability of the device are improved, and the more inferior coal tar can be processed.

Description

technical field [0001] The invention relates to a method for processing coal tar, in particular to a method for producing qualified vehicle fuel oil by using coal tar as a raw material. Background technique [0002] With the rapid development of the world economy, the demand for fuel oil products is increasing, and the quality requirements for oil products are becoming more and more stringent. The world's proven reserves of crude oil can only be used continuously for more than a hundred years based on the current production volume, and the shortage of oil resources is imminent. However, the storage of coal is very abundant, so using coal to produce vehicle fuel oil is a way. The main technologies of coal-to-oil include direct coal liquefaction and coal indirect liquefaction, etc., but these technologies are costly and expensive. complex. Another technology for coke production is that the by-product is coal tar while producing coke, which is a widely used technology at pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G49/20
Inventor 刘建锟杨涛胡长禄韩照明李长岭
Owner CHINA PETROLEUM & CHEM CORP
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