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Medium and low temperature combination processing method of coal tar

A low-temperature coal tar and combined processing technology, which is applied in the field of coal chemical industry, can solve the problems of unrelated coking heavy distillate oil utilization rate and short operation cycle, achieve low product yield, avoid cracking reaction, and improve economic benefits

Active Publication Date: 2013-01-02
吉林省弘泰新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also does not involve the improvement of the utilization rate of coking heavy distillate oil, and the short operation period of the hydrocracking catalyst due to coking

Method used

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  • Medium and low temperature combination processing method of coal tar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]The low-temperature dry distillation coal tar of Yilan lignite, whose properties are shown in Table 1, is sent to the pretreatment unit to remove mechanical impurities and water, and then subjected to atmospheric distillation to obtain light distillate oil, phenol oil and bottom oil, and the end point of light distillate oil The temperature is 180°C, the phenol oil is dephenolized to obtain dephenolized oil, the bottom oil and the liquid phase of the hydrocracking heat high-pressure separator enter the vacuum distillation tower, and the bottom of the vacuum distillation tower obtains asphalt residue, after deasphalting The heavy distillate oil (final boiling point is 580°C), as well as the light distillate oil and dephenolized oil obtained by atmospheric distillation enter the hydrotreating unit for hydrotreating reaction, and the gasoline fraction and diesel fraction obtained from the hydrotreating reaction can be out of the unit, and the heavy distillate oil obtained fr...

Embodiment 2

[0077] The hydrotreating catalyst (by weight of oxides) was prepared with the following composition: Mo, 30.0%; W, 8.0%; Ni, 2.5%; Co, 2.0%.

[0078] The solution containing the active components is a solution containing ammonium metatungstate, ammonium molybdate, nickel nitrate, and cobalt nitrate; the peptizer is nitric acid, the extrusion aid is azurite powder, and the pore expander is carbon black.

[0079] (1) Preparation of silicon-containing aluminum hydroxide. Prepare solid sodium aluminate to a concentration of 200gAl 2 o 3 / L concentrated sodium aluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L sodium aluminate working solution, first add 10L containing 25gAl to the gel forming tank 2 o 3 / L sodium aluminate working solution, while passing air and passing CO with a concentration of 45v% 2 Gas, the reaction temperature is 25°C, the reaction time is 1 hour, and when the pH value reaches 12.0, add alkaline silicon-containing materials according...

Embodiment 3

[0084] The reaction temperature in the hydrotreating section is 350°C, and the liquid hourly volume space velocity is 1.0h -1 ;The reaction temperature of hydrocracking is 378℃, and the liquid hourly volume space velocity is 0.5h -1 . Before the hydrotreatment section, a hydrogenation protecting agent is used for pretreatment. The hydrogenation protecting agent is a conventional hydrogenation protecting agent, with alumina as the carrier, containing 6% molybdenum oxide, 1% cobalt oxide, and a pore volume of 0.82mL / g. The specific surface area is 128M 2 / g. The treatment conditions of the hydrogenation protective agent are reaction temperature 310°C, pressure 15.1MPa, hydrogen oil volume ratio 1200:1 and liquid hourly volume space velocity 1.2h -1 . Others are identical with embodiment 2.

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Abstract

The invention comprises a combination processing method of coal tar. The method comprises the steps of: (a) subjecting a coal tar raw material to atmospheric distillation to obtain light distillate oil, phenol oil and bottom oil; dephenolizing the phenol oil to obtain the dephenolized oil; sending the bottom oil and a liquid phase from a hot high pressure separator in a step (d) into a vacuum distillation tower to obtain a heavy distillate with asphaltene removed; and conducting a hydrotreating reaction on the light distillate, dephenolized oil and the heavy distillate; (b) fractionating a liquid phase from the hydrotreating reaction into a light fraction and a heavy fraction; (c) subjecting the heavy fraction from the step (b) to a hydrocracking reaction; and (d) sending an effluent from the hydrocracking reaction into the hot high pressure separator, and sending the separated liquid phase to the vacuum distillation tower in the step (a). Compared with prior art, the method provided by the invention increases yield of light fuel production from coal tar, prolongs the service life of catalyst, and improves operation cycle of the device.

Description

technical field [0001] The invention relates to a method for combined processing of medium and low temperature coal tar, which belongs to the technical field of coal chemical industry. Background technique [0002] The shortage of crude oil resources in the world is imminent, and the distribution is extremely uneven, while the coal reserves are very abundant, so using coal to produce vehicle fuel oil is a necessary way. The main technologies of coal-to-oil include direct liquefaction of coal and indirect liquefaction of coal, etc., but these technologies are costly and complicated. Another coke production technology can produce coal tar by-product while producing coke, which is a widely used method at present. [0003] Coal dry distillation and coal gasification are important components of the coal chemical process, and the raw materials are mostly non-caking coal or weakly caking coal. Non-caking coal or weakly caking coal includes lignite, long-flame coal, gas coal, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/14C10C1/04C10C1/14
Inventor 王小英
Owner 吉林省弘泰新能源有限公司
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